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Copyright of Forest Research is the property of Forest 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.)

Lianas are one of the components in maintaining forest diversity. The over-increase of lianas in tropical and subtropical forests, especially in secondary forests is threatening the restoration and healthy development of forests. Few domestic researches make a comprehensive evaluation on the mechanism of the over-increase of lianas and negative effects on forests. In this paper, we reviewed and summarized the related researches on mechanisms and ecological consequences of the over-increase of lianas both at home and abroad. Based on the relevant studies we hold the opinions: (1) The increase of lianas can be corelated with drought severity, elevated atmospheric CO2, increased natural disturbance (gaps) and forest fragments. Lianas possess the advantages of rapid growth, strong reproductive capacity and phenotypic plasticity, and high resource use efficiency under the altered environment. Thus, the favorable environment and inherent advantages can contribute to the increase of lianas. (2) Lianas compete with trees by means of shading stress, resource competition and mechanical loading, abrasion, and strangulation, which all may increase the mortality of trees. (3) The over-increase of lianas can negatively affect the tree growth, reproduction, and survival; at community level, lianas can alter tree community composition and decrease community diversity; at ecosystem level, lianas can ramify forest ecosystem function by decreasing carbon storage and altering carbon, nutrient, and water cycling. Therefore, we recommend that future studies should be aimed at the correlations between population dynamic changes of liana species and environmental changes, the effect of forest disturbance on the growth of lianas, responses of lianas to the environmental changes and the adaption mechanisms, comprehensive evaluation on the ecological consequences of the increase of lianas by means of long-term dynamic monitoring plots and controlling experiments. It is also essential to find appropriate management and control strategies of the over-increase of lianas so as to provide reference for forest management and forest ecological restoration. [ABSTRACT FROM AUTHOR]

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.)

There are some problems in the shelter forest along the main stream of Songhua River, such as single tree species, single stand structure, poor quality, poor landscape diversity of shelter forest and unscientific allocation of shelter forest model. Based on this, after investigation, this paper selects trees, shrubs and herbs suitable for planting along the Songhua River, and matches 20 kinds of artificial shelter forest allocation schemes. Three basic criteria(protection function, landscape function and economic benefit) are determined. Seven evaluation indexes are selected according to the three basic criteria, and a comprehensive evaluation structure model of artificial shelter forest is established. The allocation schemes of 20 kinds of artificial shelter forest are optimized by analytic hierarchy process and entropy weight method. The results show that the combined planting of trees, shrubs and herbs can maximize the comprehensive functional benefits of shelter forest. According to the comprehensive evaluation values, the schemes of (20), (8), (17), (18), (11), (16) and (14) are determined as the best plans. This paper provides scientific support for the construction of artificial shelter forest along the main stream of Songhua River. [ABSTRACT FROM AUTHOR]

In order to structure a multi - object and stable forest ecosystem, improve the biodiversity of local ecosystem, maximize the potential of biological resources, and provide technical support for forest development, this paper discussed the effects of economic plant compound management modes on community species diversity of low quality and low efficiency secondary forest in Mudanjiang. Based on the survey data, species richness index, evenness index and diversity index were used to analyze the status of community species under different complex management modes. The study found that: ① 71 species of higher plants were investigate under the secondary forest, belonging to 21 genera and 37 families; ② The species diversity index of the compound management modes were lower than that of the control; ③ The species richness and Simpson index of different life forms in the compound management mode were higher in the herb layer than in the shrub layer than in tree layer. ④ There were no significant differences in the effects of different compound manage modes on the species diversity index. These results indicated that the above ground community structure would be changed by the compound management mode, and the initial performance was disturbance, which would gradually improve the species richness and resource utilization efficiency, and restore the ecosystem function. [ABSTRACT FROM AUTHOR]

[Objective] The purpose of the paper is to study the effects of different densities of pure Robinia pseudoacacia community and different types of mixed forest communities on the species distribution pattern and community structure of shrub and grass layers. [Method] Pure Robinia pseudoacacia community with different densities and mixed forests were taken as the research objects respectively in Zhifanggou watershed and Yanergou watershed. The variation characteristics of species diversity index were analyzed, and the effects of different community types on species diversity were discussed. [Result] In the pure Robinia pseudoacacia forest community, the dominant species in shrub layer were Ampelopsis delavayana, Periploca sepium Bunge and Duchesnea indica Focke, while the dominant species in herb layer were Artemisia sacrorum and Aster tataricus L. F. ; Shrub species diversity was the best at medium density level, while herb species diversity was the best at low density level. In the mixed forest, the dominant species in shrub layer were Periploca sepium Bunge and Duchesnea indica Focke, and the dominant species in herb layer was Artemisia sacrorum; Under the mixed forest of Robinia pseudoacacia and low-density ]uniperus formosana Hayata, shrub species diversity was better, while under the mixed forest environment of Robinia pseudoacacia and high-density ]uniperus formosana Hayata, herb species diversity was the best. [Conclusion] The density of dominant species in tree layer of Robinia pseudoacacia forest has a significant effect on the species diversity of shrub and herb layer. The decrease of density of arbor layer can effectively promote the increase of species diversity in shrub and herb layer. The species diversity of shrub layer increases at medium density level, and that of herb layer increases at low density level. [ABSTRACT FROM AUTHOR]

Schima superba is a dominant species in the lower subtropical evergreen broad-leaved forest community at Dinghushan. In order to understand the construction mechanism of lower subtropical evergreen broad-leaved forest community, we have established a 20 hm2 forest biodiversity monitoring plot at Dinghushan National Nature Reserve. The data presented in this paper are based on four field investigations of all S. superba individuals from 2005 to 2017. We further analyzed the distribution characteristics of its death rate according to diameter class and habitat type. The results were as follows:(1)The number of S. superba individuals was largely reduced from 2005 to 2017.(2)Mortality rate and growth rate of S. superba showed different patterns depending on diameter class. The relative growth rate of the individuals of 1-10 cm DBH was high and rapidly decreased, while the mortality rate increased and maintained at a high level. With the increase of DBH class, the relative growth rate of the individuals of 10-50 cm DBH rose and decelerated, and then decreased, while the mortality rate decreased. The mortality rate of those individuals above 50 cm DBH was large while the growth rate was little.(3)The mortality rate of the individuals in each habitat in 2010 was not apparently different. However, in 2015, the mortality rate of individuals in high-altitude habitats(high slopes, ridges, and valleys)was greater than those in low-altitude habitats(low slopes and valleys), while those in low-altitude habitats in 2017 were higher than those in the high-altitude habitats.(4)The mortality rate was significantly positively correlated with soil pH and negatively correlated with soil organic matter, total nitrogen, total phosphorus, available potassium, and available nitrogen content. [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.)

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.)

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 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.)