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Acta Prataculturae Sinica ›› 2015, Vol. 24 ›› Issue (1): 21-30.DOI: 10.11686/cyxb20150104

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Response of the maintain performance in alpine grassland to enclosure on the Northern Tibetan Plateau

MAO Shaojuan1, 3, WU Qihua1, 3, ZHU Jingbin1, 3, LI Hongqin1, 2, ZHANG Fawei1, 2, LI Yingnian1, 2, *   

  1. 1.Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China;
    2.Key Laboratory of Adaptation and Evolution of Plateau Biota, Chinese Academy of Sciences, Xining 810001, China;
    3.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-12-18 Online:2015-01-20 Published:2015-01-20

Abstract: In order to improve the management of degraded grasslands, the characteristics of the plant communities (structure and biomass) were investigated under three grazing treatments; unrestricted grazing, 3-year enclosure and 7-year enclosure in Shenzha, Northern Tibet. The result showed that, after enclosure, vegetation height gradually increased as the duration of enclosure increased. Above-ground and below-ground biomass, vegetation coverage and community species diversity were highest in the 3-year enclosure treatment, and Pielou evenness index was the largest in the natural-grazing. Biomass and the important value of grass and sedge functional groups increased with extended enclosure time, while values for the forbs functional groups decreased significantly, indicating that enclosure promoted plant community succession. Analyzing the relationship among plant coverage, above-ground biomass, community composition and enclosure time suggested that three-five years of enclosure at a stocking rate of 1.23 sheep/ha is appropriate for the degraded alpine grasslands in this region.