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| Analysis on stability of plant community under different measures of desertification control in Yanchi County,Ningxia |
| Lu Xiaojie,Li Rui,Zhang Kebin |
| College of Soil and Water Conservation,Beijing Forestry University, Key Laboratory of Soil & Water Conservation and Desertification Combating,Ministry of Education,100083,Beijing,China |
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Abstract Taking α-diversity index(including Shannon-Wiener index,Simpson index,Jsw,and Js which are community evenness indces) and β-diversity index(measured by similarity coefficients),biomass change coefficient as targets this article analyze the stability of plant community under different measures of desertification control in Yanchi County,Ningxia from two criteria about Space and time.The result indicated: Analyzing based on α-diversity and stability,the plant diversity index and community evenness index of the measure by converting cropland to forests are highest,the change of the indces of the measure about artificial fencing during years is slightest;analyzing from β-diversity and stability,the plant community similarity coefficients of the measure with artificial fencing are highest and the change during years is slightest,so,the plant community is stablest and the stability by converting cropland to forests is inferior to it.Analyzing based on function target,the biomass of years with artificial fencing is biggest,and the change of the biomass by converting cropland to forests is slightest.
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Received: 15 June 2007
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