Abstract
In this study,we selected the artificial grasslands with different restoration years and natural grasslands with different degradation levels to explore the changes of vegetation reproduction mode,aiming to find the feasible restoration approaches derived from the theoretical study.We found that grassland degradation and establishing artificial grassland had significant effect on the number and biomass of asexual and sexual shoots.The main conclusions are as follows: asexual reproduction dominated in the native alpine grassland.The number and biomass of asexual shoots of natural grasslands were basically lower than those of cultivated grasslands.The number of asexual shoots increased with the cultivation ages(P0.05),and decreased with the degradation degree(P0.05).On the contrary,the number and biomass of the sexual shoots presented opposite trend with those of the asexual shoots.With the increase of restoration years,the components of asexual and sexual shoots were close to non-degraded grassland.At the functional groups level,the number and biomass of asexual shoots were decreased with the restoration years(P0.05),while those of sexual shoots were presented on the opposite trend;moreover,the components of grasses were significantly higher than other two groups(P0.05).At the same time,we found that forbs accounted for absolute advantage,the similar change can be seen about degraded grassland as compared with artificial grasslands along the degradation levels.The above conclusions indicated that grassland degradation had altered the reproductive allocation and strategies about plant community,and establishing artificial grasslands is an efficient method to restore degraded alpine grasslands.
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