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Copyright of Journal of Shenyang Agricultural University is the property of Journal of Shenyang Agricultural University Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To clarify the degree of coupling and coordination between herbaceous plant community diversity and soil factors after slope vegetation restoration, the understory herbaceous plant communities and soils of 18 typical slope vegetation greening models in Yan’an New District were used as research objects. Five 1 m× 1 m sample plots were set up in each model and the physical and chemical properties of the soil in the sample plots were measured. The gray correlation method was used to construct a vegetation-soil coupling model to evaluate the coupling relationship between herbaceous plant diversity and soil factors after slope vegetation restoration. The results showed that there were 22 species of herbaceous plants, belonging to 12 families, on the slopes of Yan’an New District. Among them,the families Asteraceae and Poaceae were the most abundant, both accounting for 22. 73% of total species number. The degree of feedback of the herbaceous plant community diversity indices to the soil was in the order of Shannon-Wiener＞ Margalef＞ Simpson＞ Pielou indices. The correlation between the herbaceous plant community diversity and soil factors in the study area was moderate or above, of which the correlation coefficient of soil electrical conductivity, which was more closely related to community diversity, was 0. 852. Overall, the performance of the coupling relationship between herbaceous plant diversity and soils after slope vegetation restoration in Yan’an New District was good, and 66. 67% of existing greening models have already crossed the stage of incongruity in this coupling relationship. However, the understory of herbaceous plant communities and soil systems are yet to reach the optimal coordination level. [ABSTRACT FROM AUTHOR]

This study explores the environmental changes in the disturbed area of coal mining and presents the driving factors of ecological self-restoration. Specifically, we measured the soil nutrient and soil enzyme indicators in the mining area and non-mining area from 2014 to 2017 and 2019, and evaluated the stoichiometric characteristics of soil carbon (C), nitrogen (N), and phosphorus (P). The experimental results show that the total phosphorus concentration gradually recovered with the increase of mining years, while organic matter, available potassium, and urease first increased and then decreased with the increase of mining years. There were significant differences in total phosphorus, C/N ratio, N/P ratio, and C/P ratio between the working face and the subsidence disturbance zone. Random forest analysis showed that soil sucrase, urease, available potassium, total nitrogen, total phosphorus, C/P ratio, C/N ratio, and water-soluble salts were the key factors influencing soil nutrient cycling in different time periods; while C/N ratio, N/P ratio, total phosphorus, alkaline phosphatase, and water-soluble salts were the key factors influencing soil nutrient cycling at different locations. Mining years of the working face has differing influence path on soil factors and soil enzymes. This study could provide theoretical proof for the artificial guided self-restoration plan in coal mining subsidence areas and for ecological restoration in western mining areas.

Copyright of Journal of Northwest A & F University - Natural Science Edition is the property of Editorial Department of Journal of Northwest A&F University (Natural Science Edition) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Leaf and root are the most sensitive organs to environment, exploring the relationship between root and leaf functional traits and their responses to environmental factors is helpful to reveal the utilization of resources by plants and their adaption trategies to environment. In order to explore the adaptive strategies of coastal plants, the sandy coastal herbaceous plants in Pingtan Island were taken as the research objects. Three distance gradients were set up from sea and land. Six leaf function traits, leaf thickness, individual leaf area, leaf dry matter content, specific leaf area, leaf tissue density, leaf phosphorus content, and five fine root function traits, root average diameter, root tissue density, specific root length, specific root area, root phosphorus content, were measured to analyze the function traits of leaf and root of coastal plants and their responses to soil factors. The results were as follows: (1) The variation coefficient amplitude of root and leaf function traits in intertidal zone was the smallest, and it was the largest on the gradient 30-60 m away from the high tide line. The individual leaf area, leaf phosphorus content, root average diameter, root tissue density, and root phosphorus content increased with the distance from sea to land; the leaf dry matter content, leaf tissue density, specific root length and specific root area decreased. (2) Plants balanced resource allocation between growth and defense through trait combinations, which showed that there were different degrees of correlation among leaf traits, root traits and root-leaf traits. Among the aboveground and underground corresponding traits, leaf thickness-root average diameter, leaf-root phosphorus content were significantly positively correlated. Specific leaf area with specific root length, specific root area, leaf tissue density-root tissue density had no significant correlation. (3) The interpretation degree of soil factors to the changes of coastal plant functional properties was 52.05%, of which the soil salt content had the greatest impact, followed by soil water content, soil electrical conductivity and soil pH value. In conclusion, in the harsh coastal environment, the soil salt content, soil electrical conductivity, soil water content and soil pH value decrease gradually from sea to land, and the overall environment is low in phosphorus and high in salinity. The plants have shown different survival strategies: the plants closer to the sea adopted the strategy of leaf resource conservation type and root resource acquisition type; the plants farther away from the sea, the strategy of leaf resource acquisition type and root resource conservation type is adopted. The results of this study provide a certain reference value for understanding the response mechanism and adaptability of coastal herbs to environmental gradient changes, which is conducive to the analysis of soil and other environmental characteristics to screen and plant suitable species according to gradient, and promote the restoration and protection of coastal plants.

[Objective]To understand the community structure and soil environment status of the mountain top dwarf forest in Yangming Mountain, Hunan. [Method]A field investigation was conducted on the mountaintop dwarf forest in Yangming Mountain, Hunan Province, and the soil of the habitat was measured. [Result]The results showed that a total of 37 families, 51 genera, and 68 species of plants were recorded in the low forest sample plot on the mountaintop of Yangming Mountain. Among them, Rhododendron are the dominant genera in the tree layer and shrub layer. Rhododendron fortunei occupies an absolute dominant position in the number, height and importance value, and showing singledominant community structure. The important values of tree layer, shrub layer and herb layer were significantly correlated with OM and TN(P< 0. 05). [Conclusion]The mountaintop dwarf forest in Yangming Mountain, Hunan Province is a special community variant formed by the longterm development of subtropical evergreen broad-leaved forest in a special mountaintop habitat, with structural characteristics of single superior species communities; Among them, soil factors are of great significance for the development of subtropical mountaintop vegetation. [ABSTRACT FROM AUTHOR]

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

How plants change functional traists to adapt to the environment has always been the focus of ecology. In order to explore the adaptive strategies of plant leaves at different succession stages in karst forest of Maolan, taking the dominant species in five different succession stages (herb, shrub, shrub-arbor, arbor and climax community stages) in Maolan Nature Reserve as the research object, the leaf functional properties and soil physical and chemical properties of dominant plants at different succession stages were measured. The results were as follows: (1) With the succession of vegetation, soil total nitrogen (STN) content, soil organic matter (SOM) content and soil water (SWC) content gradually increased, soil total phosphorus (STP) content and soil total potassium (STK) content first increased and then decreased, and soil pH value showed a decreasing trend as a whole. (2) With the succession of vegetation, leaf area (LA), leaf dry matter content (LDMC), leaf thickness (LT) and leaf carbon content (LCC) gradually increased. On the contrary, specific leaf area (SLA) and leaf potassium content (LKC), leaf nitrogen content (LNC) increased first and then decreased, and leaf phosphorus content (LPC) decreased first and then increased. (3) Redundant analysis showed that plants were mainly distributed in the soil environment of high pH and relatively low STK, STP, SWC, SOM and STN at the early succession stage. Plant leaves in the community took high SLA, LNC and LPC, and low LA, LDMC, LT and LWC. Plants at the late succession stage were mainly distributed in the soil environment of high moisture and nutrients. LDMC, LT, LA and LWC showed an upward trend compared with the early succession stage, and SLA, LNC and LPC showed a downward trend compared with the early succession stage. In conclusion, with the forward succession of vegetation, plants adapt to the environment by changing functional traits, and leaf functional traits change from open strategy in the early succession stage to conservative strategy in the late succession stage.

[Objective] Tt is important to investigate the relationship between soil water and each environmental factor in the deep profile after vegetation change in the Loess Plateau and to identify the main controlling factors for the comprehensive regulation of soil water. Methods] Soil samples were collected from farmland, grassland and the 15 m depth of the habitation of salix psammophila and Populus in Dingbian County, northern Shaanxi. The soil samples were analysed using traditional statistics and wavelet coherence analysis. Results] The order of magnitude of soil water content and storage in ()一15 m was farmland〉grassland a salix psam m op hila '> pop la r, with water deficit of 81 0 mm, 1 375 mm, 1 371 mm and 1 7 62 m m, respectively. Based on wavelet coherence analysis of control factors, soil electrical conductivity (EC) was found to be the single dominant factor explaining water transport, and the area of positive correlation between EC and soil water was found throughout the scales. The two-factor combinations that combined effect of farmland are EC and sand, and magnetic susceptibility and sand for the lands grown salix psammophila and poplar. The two-factor combinations enhanced the degree of coherence mainly at large scales. Conclusion] Deep soil water is more influenced by soil properties, but plant root conditions can seriously perturb the relationship between water and soil properties. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Litterfall is the carrier of material and energy conversion between plants and soil, and an important link of the nutrient cycle in terrestrial ecosystem. In this paper, during the 2010 and 2011 growing seasons (May -- October), we studied the production, decomposition and turnover of the litterfall of two Reaumuria soongorica communities, located in the Sangong River basin with different growth, as well as their association with soil factors and responses. In the research process, we used the collector and decomposition bag method. The results showed that the monthly litterfall production of the two communities increased initially, and decreased thereafter with time. Their production reached the maximum value in July and August, respectively. The annual litterfall production of community 1 and community 2 was 25.42 g·m–2·a–1 and 34.05 g·m–2·a–1, respectively. The supplement amount of litterfall to soil organic carbon was 11.81 g·m–2·a–1 and 17.65 g·m–2·a–1, respectively. The residual rate was 71.81% and 75.60% after a year's decomposition in community 1 and community 2, respectively. When the litterfall decomposition reached 50% and 95%, it took 2.52 and 14.64 years for community 1 and 3.69 and 20.13 years for community 2, respectively. The turnover of litterfall in community 1 and community 2 was 1.21 times·a–1 and 0.98 times·a–1, respectively. Soil water content, pH and bulk density were the main factors affecting the decomposition of litterfall in the two communities. [ABSTRACT FROM AUTHOR]

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] The present paper aimed to study the effect of physicochemical properties of rhizosphere soil on quality of Coptis deltoidea C. Y. Cheng et Hsiao and further to provide scientific basis for ecological planting of C. deltoidea. [Method] Eighteen soil physicochemical indexes and six alkaloids of C. deltoidea were determined by soil agrochemical analysis and high performance liquid chromatography (HPLC) . Meanwhile, correlation analysis and redundancy analysis were used to reveal the relationship between physico-chemical properties of soil and the accumulation of alkaloids in C. deltoidea. [Result] The total contents of 6 alkaloids in taproots of C. deltoidea that grew for two to five years old were 3. 716%, 5. 720%, 8. 552% and 8. 866%, respectively, and the contents of berberine were 1. 779%, 3. 620%, 5. 469% and 5. 706%, respectively, which indicated that the four-year-old C. deltoidea had met the harvesting standard. The correlation analysis of alkaloids and soil factors in the taproot of C. deltoidea showed that total amount of 6 alkaloids and berberine content were significantly positively correlated with available potassium (P＜0. 05), and significantly negatively correlated with nitrate nitrogen and sodium (P＜0. 01) . And a significant negative correlation was also seen between sodium and rhizobine (P＜0. 01) . There was significant negative correlation between coptidine and copper (P＜0. 05), and extremely significant negative correlation between coptidine and sodium (P ＜0. 01) . Finally, according to the redundancy analysis of alkaloids in taproot and soil factors, the contents of available phosphorus, available potassium and sodium in soil were the dominant factors affecting the accumulation of alkaloids in C. deltoidea, while ammonium nitrogen and pH were the more important factors. [Conclusion] In the process of planting C. deltoidea, high-quality soil environmental conditions can be selected from the planting source, that is, the soil with high nitrogen and potassium, low phosphorus and sodium and acidic pH can be selected. Moreover, the alkaloid content of C. deltoidea can be regulated by adding potassium fertilizer and nitrogen fertilizer, controlling the application amount of phosphate fertilizer and reducing the content of sodium in the soil. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Guangxi Normal University - Natural Science Edition is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of Botanical Research is the property of Bulletin of Botanical Research Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Mountain Research (10082786) is the property of Mountain Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Northwest A & F University - Natural Science Edition is the property of Editorial Department of Journal of Northwest A&F University (Natural Science Edition) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Tea Science is the property of Journal of Tea Science Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The productivity of natural ecosystem is closely related to many factors, such as biodiversity, functional traits of dominant species and soil property, thus is controlled by multivariable process. In this paper, the effects of species diversity, functional diversity, functional traits of dominant species and soil factors on community productivity of Lishan Mountain meadow in Shanxi province were studied by using structural equation model. The results showed that species diversity had no effect on productivity (γ=0.10, P=0.69), but the functional traits of dominant species (γ =0.61, P=0.00), functional diversity (γ =0.47, P=0.04) and soil factors (γ=0.34, P=0.02) had a direct impact on productivity, and soil factors had an indirect effect on productivity by the functional traits of the dominant species and functional diversity, with the indirect effect coefficients being 0.35 and 0.27, respectively. The functional traits of dominant species were the best predictors of productivity, followed by functional diversity and soil factors. Therefore, understanding the change of natural ecosystem productivity should be based on the introduction of multiple methods, with emphasis on the functional traits of dominant species. [ABSTRACT FROM AUTHOR]

Copyright of Mycosystema is the property of Mycosystema Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The river basin of Ebi Lake represents a typical ecosystem in arid land, a sensitive area for global change and a key protected area for biodiversity. The study of the relationship among biomass allocation of above-ground and below-ground plant, response mechanism of edaphic factor, and allometry helps understand the plants' survival and optimization strategies in terms of soil conditions and ecological functions. With excavation as the method that gave us adequate biomass information and the physical and chemical properties of the soil, four desert plants in the research area were analyzed: Suaeda salsa, Seriphidium kaschgaricum, Horaninowia ulicina, and Alhagi sparsifolia, among which the biomass, its allocation ratio in response to the edaphic factor, and allometric models were compared. The results were as follows:(1)There were significant differences in the biomass and its allocation ratios among the four plants, with Seriphidium kaschgaricum having the largest above-ground and below-ground biomass, while Horaninowia ulicina the smallest; The R/S(root-shoot ratio)showed Alhagi sparsifolia > Horaninowia ulicina and Seriphidium kaschgaricum > Suaeda salsa(P<0.05).(2)The effect of edaphic factor on R/S analyzed with RDA showed that the interpretability of edaphic factors towards R/S in terms of the four plants were 16.3%, 24.8%, 33.1% and 35.4%, respectively. Among them, the soil total nitrogen had a positive correlation with the R/S of Horaninowia ulicina (P<0.05), and the soil moisture a significantly positive correlation with the R/S of Suaeda salsa(P<0.01).(3)The four plants all had significant correlations with regards to AGB-BGB(P<0.01), where the AGB-BGB of Seriphidium kaschgaricum had a pattern of isometric scaling(α=1), while both Horaninowia ulicina and Alhagi sparsifolia showed an allometric scaling of α=3/4, and Suaeda salsa belonged to the allometric scaling of a non-3/4 power exponent(α<1). All the four plants shared a common allometric scaling index(0.767). The above results indicate that the desert plants in Ebi Lake have functional convergence, and the characteristics of their spatial distribution are species-specific in response to edaphic factors. [ABSTRACT FROM AUTHOR]

[Objective]The present paper aimed to understand the correlation degree between the quality of flue-cured tobacco and the main ecological factors in typical flue cured tobacco-growing areas, and provide a theoretical support for tobacco production. [Method] Through collecting typical flue-cured tobacco samples related meteorological data were selected and the correlation between chemical composition and sensory quality of flue cured tobacco and meteorological and soil factors in typical tobacco growing areas by grey relational grade were analyzed. [Result] (i) For Ninger, Huili and Hongta: the average temperature increased initially and then decreased slightly in the early stage of the growth period; the average relative humidity fertility rate increased and then stabilized; the rainfall amount reached the maximum in the medium of maturity; and the precipitation in the three places was more in the early growth period; in the early days, the early sunshine was low, and the three places reached the lowest sunshine in the early stage of maturity; the temperature difference showed a slight increase after the first drop; the average temperature were slightly decreased in the early stage of the growth period of flue-cured tobacco; the sunshine was abundant in the early stage of the growth period, and the late stage of the growth period was low, and the lowest sunlight was reached in the early stage of growth; the temperature difference showed a slight increase in the state after the first rise. (ii) The grey incidence of Cation exchange capacity with total sugar, reducing sugar, salt and nicotine was the highest, effective boron and chlorine content in tobacco leaves, highest effective iron and potassium in tobacco leaves grey incidence was the highest, chlorine and starch content highest grey relation; Effective boron and tobacco aroma, concentration of aroma, sweet temperament, and stimulating momentum and sensory evaluation of grey correlation, the highest total score of mixed eas and the soil water soluble chloride, highest degree of clean and moist feeling with effective phosphorus highest correlation. (iii) The correlation between the total sugar and the temperature difference was the highest, and the correlation degree between the reducing sugar and the starch and the average relative humidity was the highest, and the nicotine, chlorine and potassium were the highest in the sunshine hours; the concentration, irritation, the correlation between the total score of sensory quality and the average relative humidity was the highest, and the correlation degree was the highest with the sunshine hours, the highest degree of aroma and average temperature, and the highest degree of wetness and temperature difference. [Conclusion] From the aspects of meteorological factors, the Hongta and Ninger are suitable for the production of high quality flue cured tobacco leaves; the relative humidity and sunshine hours had a higher effect on the flue-cured tobacco leaves; and the effects of different nutrients on soils were different, and the effect of soil available boron was significant. [ABSTRACT FROM AUTHOR]

Copyright of China Sciencepaper is the property of China Sciencepaper and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Soil erosion is the main driving force of soil organic carbon (SOC) loss and plays an important role in the global carbon cycle. It is helpful to understand the mechanism of SOC loss under soil erosion by evaluating the main driving factors of SOC loss under soil erosion and their influence degree. Therefore, based on 24 cases published in domestic and foreign journals from 2007 to 2021, this study investigated the effects of soil erosion on SOC loss in China under different climatic factors (climate types, rainfall, and rainfall intensity) and soil factors (soil types, bulk density, and aggregate size) by using Meta-analysis. The results showed that:① compared with that under no erosion disturbance, the SOC content under erosion decreased significantly (overall decreased 16.0%), showing obvious negative response characteristics. ② Under the erosion background, the negative response degree of SOC to different factors was as follows:rainfall intensity (65.0%)>mean annual rainfall (24.3%)>soil types (21.4%)>bulk density (20.2%)>aggregate size (16.5%)>climate types (9.1%). ③ Principal component analysis showed that climate was the dominant factor affecting SOC loss, and rainfall intensity was again shown to be the key factor. In this study, the characteristics and influencing factors of SOC loss under soil erosion in China were analyzed, which provided theoretical reference for the systematic understanding of the role of soil erosion in the carbon cycle.

In this paper, the correlation between the chemical constituents of Chinese herbal medicines Daphnes Cortex and the ecological factors and soil factors was studied, which provided a reference for the selection of suitable areas for artificial cultivation of Daphne giraldii and wild tending. The geographic information system(GIS) was applied to obtain the ecological factor information of 23 collection sites of Daphnes Cortex, and the soil factor information was determined by the standard procedure in the soil test standard manual. Combining the information of 93 chemical constituents of Daphnes Cortex in 23 collection sites the correlation between components and ecological factors and soil factors was analyzed by statistical methods. The correlation analysis showed that the longitude, annual average rainfall, annual sunshine intensity, annual average temperature in the ecological factors, soil type, effective copper and pH value were the dominant factors affecting the chemical composition of Daphnes Cortex.

In this study, vertical changes in bacterial α-diversity and community composition were investigated at four soil depths(0-10, 10-20, 20-40 and 40-60 cm) in Betula albosinensis Burkill forest of Qinling Mountains by sequencing of the 16S rDNA regions using Illumina MiSeq high-throughput technology. The results showed that the decreases of OTUs, Chao1 and Shannon were numerical but not significant, and the highest values of 1688, 2314 and 8.66 were obtained in 0-10 cm, respectively. At the phylum level, Acidobacteria and Proteobacteria were the most dominant bacteria in four soil layers. At the genus level, Gp4, Gp6 and Gp16 were the most dominant bacteria. The relative abundance of Acidobacteria in 40-60 cm soil depth(62.88%) was higher than those in other soil depths. Proteobacteria in 0-10 cm(23.62%) was more abundant than that in 40-60 cm. The relative abundance of Acidobacteria was significantly correlated with the total N, soil organic carbon, C/N, and soil dissolved organic carbon. Soil water content, soil organic matter and soil dissolved organic carbon were the key factors affecting soil Proteobacteria. RDA sequencing results showed that soil dissolved organic carbon was the key factor contributing to the bacteria community abundance. The results demonstrated that there are plenty of bacterial distribution in all four soil layers, which provides a fundamental basis for vertical soil bacterial community diversity, and possesses very important research value in biogeochemical cycling.