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Beijing Forestry University (2010)

Semi-arid Plant Diversity Conservation And Ecosystem Management

杨秀莲; Yang Xiu Lian

Titre : Semi-arid Plant Diversity Conservation and Ecosystem Management

Auteur : 杨秀莲; Yang Xiu Lian

Grade : Master’s Theses 2010

Université : Beijing Forestry University

Yanchi county is an arid to semi-arid transition zone, its changes in the environment deeply affect eastern part, the survey and protection of plant diversity have important meaning, It can provide the foundation for sustainable use of resources through put forward the building of eco-management according to restoration of vegetation, conservation effectiveness and environmental impact analysis.This paper analyze the protective effect of diversity by working with vegetation types, distribution and species diversity. Investigate vegetation and soil by sampling method and Line transects from June to August between 2005 and 2009, and come to understand status and recovery of vegetation in Yanchi county by using TWINSPAN two-way indicator species classification and Plant diversity calculation. Analyze the impact effect of precipitation and protection measures through the annual change of plant diversity and vegetation under different site conditions, And for Microbiotic soil crust, external disturbance and other factors, put forward related management proposals in connection with impacts on revegetation in Yanchi county. the preliminary conclusions were as follows :(1) Compositae is the most extensively distributed, about 20~30 percent in Yanchi County vegetation, second for Leguminosae and Gramineae, about 20 percent, Chenopodiaceae is about 10 percent, the more common species such as:Zygophyllaceae, Euphorbiaceae, Convolvulaceae, Rutaceae, Asclepiadaceae, Cruciferae, Polygalaceae.(2) Community diversity of Ha Bahu Nature Reserve has significantly correlated with other plots illustrated that it holds more community types, so the establishment of protected areas have more effective to protect the diversity.(3) The water used by vegetation growth comes mainly from natural precipitation, The amount are closely related to vegetation, the studies indicate that 9 percent moisture content has the largest diversity in 0~30cm depth soil.(4) Microbiotic soil crust affect the infiltration, the soil which remove crust have increased infiltration rate and accumulated infiltration depth, biological soil crust formation time of up to 9 years inhibit the vegetation growth, the diversity of the soil which remove crust is greater than a crust covering, there exists competition in nutrition and moisture between crust and vegetation.With preliminary findings from research and analysis, several measures have been put forward, such as moderate tilling the soil,the number of livestock decided according to an annual output of biomass,strengthen the monitoring of vegetation dynamics, on wetlands for water supply,and enhance the protection efforts, on this basis, to coordinate development and ecological protection,and maintain the ecological balance

Mots clés : Semi-arid; Plant diversity; protection; eco-management;

Présentation (CNKI)

Page publiée le 22 avril 2013, mise à jour le 15 mars 2018