The main forage succession and ground surface characteristic changes during degradation and restoration of alpine Kobresia meadow

Abstract

Abstract: The change of soil surface characteristics during degradation and restoration of alpine Kobresia meadow was followed together with the important value changes of Kobresia pygmaea, K. humilis and Gramineae and of their patch dispersal. During degradation, the value of K. pygmaea was significantly more important than that of K. humilis and Gramineae(P＜0.05). In a transect, the coverage of K. humilis was rapidly reduced, the coverage of black patch increased to nearly double, and patches of K. pygmaea were widely dispersed. K. pygmaea is the dominant species in seriously grazed K. pygmaea meadow, and its importance is significantly higher than that of K. humilis and Gramineae(P＜0.05), the coverage of black patch increased, then collapsed. The emergency ratio of K. humilis patch is little. In the course of restoration, the importance of Gramineae increased, K. humilis was not common, and in the restoration patch, Gramineae became the dominant species while K. pygmaea nearly disappeared and the coverage of black patch and bald patch shrunk, but plant coverage increased. Gramineae became the dominant species in the better restoration meadow, and the importance of K. pygmaea and K. humilis decreased: there was no black patch or bald patch. Alpine meadow degradation resulted in a succession of dominant species, but black patch and bald patch were universal. Fencing and light grazing measures can effectively restore degraded meadows.

CLC Number:

LI Yi-kang, LIN Li, ZHANG Fa-wei, LIANG Dong-ying,WANG Xi, CAO Guang-min. The main forage succession and ground surface characteristic changes during degradation and restoration of alpine Kobresia meadow[J]. Acta Prataculturae Sinica, 2010, 19(5): 179-185.

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