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[1]LI Junqin.Effect of Plant Diversity After Years of Enclosure in Semi-arid Area Grassland[J].Research of Soil and Water Conservation,2015,22(06):224-228.

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Effect of Plant Diversity After Years of Enclosure in Semi-arid Area Grassland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 06 Page number: 224-228 Column: Public date: 2015-12-28

Title:: Effect of Plant Diversity After Years of Enclosure in Semi-arid Area Grassland

Author(s):: LI Junqin; Institute of Hydroelectric & Investigation of Shanxi, Taiyuan 030024, China

Keywords:: biodiversity; enclosure; important value; grassland vegetation; semi-arid area

CLC:: Q948

DOI:: -

Abstract:: We took artificial fencing area of Yanchi County in Ningxia as the research site. We had observed the community types and the characteristic value of vegetation enclosure region since 2003, and analyzed the community structure, the important value and the species diversity.The results showed that：(1) the fencing had changed the community composition in the enclosure area, the status of dominant species (Artemisia ordosica) had decreased gradually in this area, and the community structure had also changed; (2) fencing enclosure was beneficial for vegetation restoration at the beginning, but vegetation restoration speed slowed down gradually over the time, vegetation began to degenerate in the fifth years after enclosed. The vegetation coverage and biomass gradually reduced, indicating that the fencing time and vegetation restoration were not a simple linear relationship, long time of the enclosure was not conducive to the recovery of vegetation in the enclosed grassland. We should take some appropriate and reasonable human intervention to the enclosure area in this time, such as cutting or seasonal grazing; (3) this study showed that the various diversity of species was in a cyclical fluctuation with fencing time, the changes of Shannon-Wiener and Simpson diversity index with years were basically same with species richness, they all performed that in the first few years of enclosure decreased with fencing time, but with the increase of time, they would be much higher than those at the beginning of the enclosure years, and then showed with some regular fluctuation, and the frequencies of low peak and peak were all about once every four years.

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