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[1]LI Rui,LIU Yun-fang,ZHANG Ke-bin.Study on the Grassland Vegetation Quantitative Fluctuation in Yanchi County[J].Research of Soil and Water Conservation,2008,15(04):220-223.

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Study on the Grassland Vegetation Quantitative Fluctuation in Yanchi County

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 15 Number of periods: 2008 04 Page number: 220-223 Column: Public date: 2008-08-20

Title:: Study on the Grassland Vegetation Quantitative Fluctuation in Yanchi County

Author(s):: LI Rui¹, LIU Yun-fang², ZHANG Ke-bin³; 1. The Fourth Survey and Design Institute of China Railways, Wuhan 430063, China;
2. The Administration office of Wuhan, Jingyihu Park, Wuhan 430023, China;
3. College of Soil and Water Conservation of Beijing Forestry University, Beijing 100083, China

Keywords:: population community; integrated quantitative characteristic index; quantitative fluctuation

CLC:: S812

DOI:: -

Abstract:: Taking Yanchi County,Ningxia Hui Autonomous Region as the research area,the quantitative fluctuation of main vegetable population and character index dynamic of vegetable community from 2002 to 2005 were analyzed.Less affected by precipitation,Artemisia ordosica Thunb had a raising quantitative character from 2002 to 2005.They were the important plants for maintaining regional ecological balance in years of drought.Some herbaceous perennids such as Anaeurolepidium secalium had a downtrend in fluctuation from 2002 to 2005.Having been badly affected by total precipitation in the year or before survey,some annual herb such as Setaria viridis and Eragrostis poaeoides took on climatic fluctuation style.The analyses of community quantitative character of Yanchi from 2002 to 2005 showed that vegetation coverage,density and species number had the same trend as precipitation fluctuation in years,while vegetation height and biomass didn’t,because of the hysteresis of precipitation to vegetation.The main climate factor of grassland vegetable fluctuation in Yanchi was precipitation and there were also something with man-made factors,for example convening cropland to forests,artificial fencing and discontinuing farming,letting go out of cultivation and so on.

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