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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (2): 305-312.DOI: 10.11686/cyxb20140236

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Effects of zokor-mound succession on plant functional group and productivity

ZHANG Ling-fei, ZHANG Xin-zhong, ZHANG Yan-kun, YE Na-na, FU Hua, JIANG Xiao-lei   

  1. State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
  • Received:2012-03-12 Online:2014-02-25 Published:2014-04-20

Abstract: Using a spatial sequence instead of a temporal sequence approach,the species diversity and productivity of different plant functional groups, including life form groups and palatability groups, were investigated along a successional gradients of zokor-mond in alpine meadows on the Qinghai-Tibetan Plateau. Plant functional groups of both life forms and palatability, as well as productivity were strongly affected by the succession on zokor-mounds. For life form groups, with an increase of successional gradients, the diversity of annuals significantly decreased, perennial grasses significantly increased, while sedges and perennial forbs showed a unimodal tendency. The situation of successional effects on productivity for life forms was similar to that of species diversity. For palatability groups, the diversity of poisonous and fine species peaked in the intermediate stage, while the diversity of inferior, medium and excellent species increased considerably along the successional gradients. The peak productivity of poisonous and fine species was also manifested during the intermediate stage. The productivity of inferior species decreased significantly, while that of medium and excellent species increased dramatically along the successional gradients. These results indicate that the succession on zokor-mounds benefits both the plant functional group diversity and grassland productivity.

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