Search

Copyright of Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher 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 Edulis Fungi is the property of Acta Edulis Fungi 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 problem of micro-pressure waves caused by the high-speed train passing through the tunnel from the open line become more and more serious with the increase of the train speed. The combined buffer structure can better mitigate the impact of micropressure waves than the single type of buffer structure. In order to further alleviate the impact of micro-pressure waves on the surrounding environment of the tunnel, a buffer structure named ladder ventilation type combined buffer structure was proposed. Based on the standard κ-ε two-equation turbulence model ( κ is the turbulent kinetic energy, ε is dissipation rate) and the numerical simulation method, four ventilation window parameters were studied, including the ventilation distance, the ventilation ratio, the number of ventilation windows, and the position of ventilation windows. The initial compression wave pressure and pressure gradient caused by the train entering the tunnel with different ventilation windows were analyzed, and the optimum parameters of the combined buffer structure were obtained. The buffer structure has less impact on the maximum pressure of the initial compression wave, but more impact on the initial compression wave pressure gradient. When the ventilation distance is 4 m, the ventilation rate α is 36%, the number of ventilation windows is 2, and the position of ventilation windows is the top ventilation, it is the optimal working condition, and the mitigation effect on pressure gradient reaches 60.14%. [ABSTRACT FROM AUTHOR]

Objective To investigate the effect of the strong bone and muscle form ula on bone mineral density ( BMD ) and IL-17 level in ovariectomized ra ts. Methods Thirty SPF grade 6-month-old female SD rats were divided into Sham group ( 11 = 9) and model group ( n = 21) according to random number table. After 12 weeks, 3 rats were respectively se lected from the Sham group and OVX group for lumbar vertebrae BMD test to verify the success of modeling. Rats in the model group were divided into OVX group ( n = 6), ZGQJ group ( n = 6 ), and Alen group ( n = 6 ). Rats in ZGQJ group received the strong bone and muscle formu la. Rats in Alen group received alendronate sodium. After 12 weeks of the treatment, the rats were sacrificed. BMD of the lumbar vertebrae was detected with DEXA. The microstructure of the tibia was detected with micro-CT. The structure of the femur and spleen was observed with HE staining. Serum level of IL-17 was detected with ELISA. The level of IL-17 in the tibia was detected with immunofluorescent staining. The level of IL-17 in the spleen was detected with immunohistochemistry. Results Compared to that in OVX group, the lumbar vertebrae BMD in ZGQJ and Alen group increased significantly ( P

Copyright of Engineering Management & Technology Discussion is the property of Omniscient Pte. Ltd. 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 Urban Architecture & Development is the property of Omniscient Pte. Ltd. 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 Engineering Science Research & Application is the property of Omniscient Pte. Ltd. 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 China Brewing is the property of China Brewing 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 Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute 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 Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management 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 Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. 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 Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences 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 Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 To construct the auxiliary system of outpatient drug distribution, reduce errors and improve the quality of outpatient pharmaceutical service. Methods The bar code technology was used to independently develop outpatient pharmacy dispensing assistant system. The system design and function are introduced. The practical application effect of the system was evaluated on dispensing errors, efficiency and pharmacist evaluation. Results Based on the special network environment of the hospital, the system integrated the functions of drug check, prescription right management, expiration date management and medication instruction. After using the system, the number of dispensing errors decreased from 84 to 25. The waiting time for patients to receive medicine decreased by 151 seconds. All pharmacists surveyed agreed that auxiliary system was helpful to pharmacists ’ work. Conclusion The system reduced the medication dispensing error in outpatient pharmacy, improved work efficiency and the quality of pharmaceutical care. [ABSTRACT FROM AUTHOR]

Objective: The current study aims to analyze the correlation between retinal nerve fiber layer (RNFL) thickness, choroidal microcirculation and radial peripapillary capillary (RPC) in myopes based on a new quantitative method. Methods: Between April 2019 and January 2020, 100 eyes with high myopia (HM group) and 82 eyes with low ⁃to ⁃moderate myopia (LMM group) were enrolled in the First Affiliated Hospital of Nanjing Medical University. All subjects underwent measurements of the best corrected visual acuity (BCVA), intraocular pressure, axial length (AL)and spherical equivalent (SE) before anterior segment examination via slip⁃lamp biomicroscopy, dilated fundus examination, color and red⁃free fundus photographs and optical coherence tomography angiography (OCTA). A 4.5 mm × 4.5 mm scanning area centered on the optic disc was scanned using a frequency domain OCTA instrument, which was divided into four quadrants centered on the optic disc by the software automatically. On the scanning laser ophthalmoscope (SLO) and choroidal vasculature images, one ophthalmologist contoured the peripapillary atrophy⁃β (PPA ⁃β)zones under the supervision of another veteran ophthalmologist before calculating the area and choroidal vessel density of PPA⁃β zone using PyCharm software. The correlation between AL, SE, the area and vessel density of PPA⁃β zone, peripapillary RNFL thickness and RPC vessel density was analyzed by Spearman correlation analysis and multivariate linear regression model. Results: The average RNFL thickness, RNFL thickness of nasal, superior and inferior, and RPC vessel density, as well as the area and choroidal vessel density of PPA⁃β zone was statistically significant between HM and LMM groups (P<0.05). SE, average peripapillary RNFL thickness and the choroidal vessel density of PPA⁃β zone were positively correlated with the average blood flow density of RPC (P<0.001), while AL and the area of PPA ⁃β zone were negatively correlated with RPC vessel density (P<0.001). The multivariable model revealed that only average RNFL thickness (P<0.001) and the area of PPA⁃β zone (P=0.014) were associated with average RPC vessel density. The results of Spearman correlation analysis for four quadrantile subgroups indicated that RNFL thickness remained positively correlated with RPC vessel density (P<0.001). Conclusion: Peripapillary RNFL thickness and the area of PPA⁃β zone were two crucial causes of RPC vessel density changes, which may indicate the close relationship between retinal constructure and microvascular changes and emphasize the importance of myopia⁃related optic neuropathy. [ABSTRACT FROM AUTHOR]

Copyright of Railway Construction Technology is the property of Railway Construction Technology 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 Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 Petrochemical Universities / Shiyou Huagong Gaodeng Xuexiao Xuebao is the property of Journal Editorial Department Of Liaoning Shihua University 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 Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 To systematically review the efficacy of traditional Chinese medicine (TCM) decoction or Chinese patent medicine for primary osteoporosis (POP) in Yang deficiency of the spleen and kidney, and to provide evidence for clinical decisionmaking. Methods Databases including China National Knowledge Infrastructure (CNKI), Chinese Science and Technology Periodical Database (VIP), Wanfang data, China Biology Medicine disc (CBM), Pub Med, and Em base were searched from the establishment to 1 March 2022. Randomized controlled trials with TCM treatment for POP in type of Yang deficiency of the spleen and kidney were identified. The quality assessment was conducted by using the Cochrane risk of bias tool. Meta-analysis was performed using RevMan version 5. 3. Results Seventeen studies were included. Meta-analysis showed that in comparison with non-TCM treatment, TCM invigorating spleen and kidney showed a favorable effect in the total effective rate compared with Western medicine based on the change of bone mineral density (OR= 3. 22, 95% Cl 2. 07, 5. 00, P<0. 000 01) and the total effective rate of TCM assessed by TCM syndrome score (OR= 6. 26, 95% Cl 3. 12, 12. 58, P<0. 000 01). Compared with non-TCM, TCM showed a superior impact in improvement of lumbar bone mineral density (SMD = 0. 49, 95% CI 0. 03, 0. 95, P = 0. 03<0. 05), reduction of TCM syndrome scores (SMD = -1. 01, 95% CJ- I. 29, - 0. 73, P < 0. 000 01) and visual analogue scale (VAS, SMD = -1. 58, 95% Cl-2. 42, -0. 74, P = 0. 000 2<0. 05). There were no significant side effect to the patients. Conclusion In the treatment of POP with Yang deficiency of the spleen and kidney, TCM treatment is more effective in improving the total clinical effective rate, lumbar bone mineral density, reducing TCM syndrome score, and VAS than conventional Wes tern medicine treatment. Additionally, TCM has the advantage of high safety. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research 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 Large Electric Machine & Hydraulic Turbine is the property of Large Electric Machine & Hydraulic Turbine 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 Water Conservancy & Electric Power Technology & Application is the property of Omniscient Pte. Ltd. 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 Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology 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 China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher 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 Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 Chinese Journal of Osteoporosis is the property of Chinese Journal of Osteoporosis 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 Henan University of Technology Natural Science Edition is the property of Henan University of Technology Journal 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.)

In order to understand the growth characteristics and differences of different Ormosia henryi provenances in Guiyang, we collected seeds from ten different provenances of O. henryi and conducted seedling experiments. We compared differences in seedling height, root collar diameter, biomass, leaf photosynthetic parameters, photosynthetic pigment, activity of nitrate reductase, content of nitrate nitrogen and the root activity of the biannual seedlings, and then analyzed the differences in ten provenances of O. henryi. The results were as follows:(1)There were significant differences in the net photosynthetic rate(Pn), stomatal conductance(Gs), intercellular carbon dioxide concentration(Ci), transpiration rate(Tr)and water use efficiency(WUE)among ten O. henryi provenances(P<0.05), indicating that different O. henryi provenances showed significant differences in photosynthetic characteristics and light use efficiency. Plants from Hangzhou and Yongkang of Zhejiang had the higher photosynthetic growth potential.(2)There were significant differences in chlorophyll content, nitrate reductase, nitrate nitrogen and root activity among provenances. The contents of chlorophyll a and chlorophyll b and total content of chlorophyll were the highest in Jian'ou of Fujian provenance. These plants could efficiently transfer the accumulated light energy during the initial reaction of photosynthesis and promote carbon assimilation. Huaxi of Guizhou provenance had the highest nitrate reductase activity, the highest nitrate nitrogen content, and strong utilization ability of nitrogen elements, which could promote the synthesis of plant protein, amino acid and chlorophyll. The root system from plants in the Wangmo of Guizhou provenance had the greatest activity and the ability to absorb nutrients.(3)There were significant differences in the distribution of seedling height, ground diameter and biomass among all provenances. The plants from Hangzhou of Zhejiang provenance had luxuriant branches and leaves, developed roots and good growth performance, while the plants from Huangshan of Anhui provenance were short and had poor growth performance. Hangzhou of Zhejiang provenance distributed more biomass in roots and leaves to increase the ability of roots to absorb nutrients and leaves to acquire light energy. Huangshan of Anhui provenance accumulated the least biomass and had the worst growth.(4)The adaptability of ten provenances of O. henryi was comprehensively evaluated by principal component analysis. The results showed that Hangzhou of Zhejiang provenance > Liping of Guizhou provenance > Yongkang of Zhejiang provenance > Wangmo of Guizhou provenance > Jian'ou of Fujian provenance > Kaili of Guizhou provenance > Shiqian of Guizhou provenance > Hauxi of Guizhou provenance > Pingtang of Guizhou provenance > Huangshan of Anhui provenance. In conclusion, Plants from Hangzhou of Zhejiang, Liping of Guizhou and Yongkang of Zhejiang O. henryi provenances had high potential for adaptation and growth potential in Guiyang. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society 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 Clean Coal Technology is the property of Clean Coal Technology 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 Dalian Polytechnic University is the property of Journal of Dalian Polytechnic 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.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher 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 Food Safety & Quality is the property of Journal of Food Safety & Quality 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.)

Energy shortage and environmental pollution have led to the wide use of clean and renewable energy. A ground source heat pump (GSHP) is extensively utilized in the new building of various renewable energy, because of its energy saving, high efficiency and environmental friendliness. However, the current GSHP development is limited to a certain extent, due mainly to its high cost, and large land areas resulting from drilling boreholes. Alternatively, the concept of an energy pile was proposed to combine the GSHP exchanger of ground heat with the pile foundation of a building. However, the temperature change of pile body can result in the thermal expansion and contraction of an energy pile, thereby to induce the pile deformation in the actual operation of energy piles. This variation of temperature has endangered the structural safety of energy piles, particularly on the thermal performance and bearing capacity. Therefore, a feasible energy pile with phase change concrete has been selected, where a type of phase change material (PCM) can serve as a part of filling material in a traditional energy pile. The thermal performance of the energy pile with phase change concrete was greatly enhanced, indicating the weak temperature variation and deformation during the heat exchange, due largely to the invariable temperature and the latent heat release during the phase change of PCM. In this study, a 3D numerical model of energy piles with phase change concrete was established to evaluate the thermo-mechanical characteristics of a whole energy pile under thermal-mechanical coupling loads. A systematic analysis was made to compare the thermo-mechanical characteristics of traditional energy pile and the new one with phase change concrete. An experiment was conducted to explore the effects of the distance between two legs of U-tube, and the ratio of length to diameter of pile body on the thermo-mechanical behavior of an energy pile with phase change concrete. The results showed that the solid-liquid phase change of PCM increased the heat exchange rate at the per unit depth of pile by 10.3%, while reduced the changes in the temperature of pile body. There was a reduced changes in the displacement, axial force, and side friction resistance of pile body that caused by the temperature change. With the increase of distance between two legs of U-tube, the heat transfer rate and heat influence range of soil increased in the energy pile, while the axial force of the pile decreased, as well as the pile displacement first increased and then decreased. An increase in the ratio of length to diameter improved the total heat exchange rate of energy piles, but reduced the heat exchange rate at the per unit depth of pile, while increased the pile top displacement, which was not conducive to the stability of the energy pile. The experimental validation showed that the predicted relative errors of middle temperature in the pile wall and displacement at the pile top were within 5.1% and 12%, respectively, and the average relative errors were 4.2% and 9.9%, respectively. Therefore, the developed numerical model of an energy pile can be used to simulate the thermo-mechanical characteristics of an energy pile with phase change concrete. [ABSTRACT FROM AUTHOR]

Forest litter accumulation and decomposition contribute to the nutrient pool and are critical ecological processes in the ecosystem. The Casuarina equisetifolia L.coastal protection forest（CCPF） in Hainan Island was the focus of this study, and a total of 71 temporary sample plots were set up to investigate and analyze the stand structure and litter accumulation in CCPF by means of typical survey sampling, in order to explore the amount and impact factors of litter accumulation on C. equisetifolia. The results showed that six factors affect litter accumulation of CCPF, including the average diameter at breast height（DBH）, basal area, density, canopy density, herb coverage, and pH value; litter accumulation was significantly positively correlated with the average DBH, basal area, and canopy density（P<0.01）, highly negatively correlated with herb coverage（P<0.01）, positively correlated with density, and negatively correlated with pH value. The impact factors and related properties of semi-decomposed litter mass were consistent with those of litter accumulation, but they were negatively correlated with pH value（P<0.05）. There was no significant difference in litter accumulation in different semiarid and wet climate regions of Hainan Island（P>0.05）. In addition, the six impact factors can be divided into direct and indirect factors, and into main and non-main factors according to their different impact modes and degrees on the litter accumulation. Among them, average DBH, basal area, and density were considered direct impact factors, whereas canopy density, herb coverage, and pH value were indirect impact factors. The basal area and herb coverage were the main impact factors, among which herb coverage was an important indicator of litter accumulation. The level of litter accumulation of CCPF was high, with an average of 2.735 kg·m-2 and a maximum value of 10.090 kg·m-2. The average litter thickness was 3.629 cm, and the maximum thickness was 8 cm. In litter accumulation, the semi-decomposed litter mass accounted for 72.249%. Therefore, a large amount of litter accumulation is not only an important nutrient source for C. equisetifolia, but also one of the barriers to the regeneration of undergrowth plants. [ABSTRACT FROM AUTHOR]

Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs 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.)