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| Analysis on plant α-diversity of wetland in semi-arid region: A case study in Yanci County,Ningxia Hui Autonomous Region |
| Li Rui,Liu Yunfang,Zhang Kebin,Shen Yan,Lu Xiaojie |
| College of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China |
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Abstract The vegetable α-diversity in wetland-dry grassland was studied in Siertan wetland,Yanchi County,Ningxia Hui Autonomous Region.Taking the importance value as basic data,this paper use richness index,diversity index and abundances index to analyze the change of plant α-diversity between three strips and three lines in wetland-dry grassland ecosystem and explain main environmental factors. The results showed as follows.Affected by soil moisture content,organic matter,soil salt content,diversity index in ecotone was the biggest,the one in arid grassland strip was in the next place,while that of wetland strip,the smallest.Richness index and evenness index had the same trend as diversity index.Human activity and different landforms had brought the differences between lines.Richness index in the south line was the biggest,the next was in northwest,and the one in west line was the smallest.Diversity index had the same trend as evenness index.They were bigger in the northwest line than in the west line,while the south line had smaller ones than the west line.
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Received: 06 April 2007
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