不同利用方式对大针茅草原植被群落特征的影响OA北大核心CSTPCD

This study explored the effects of different utilization methods on community plant characteristics of Stipa grandis steppe,in order to provide scientific data to assist with the formulation of an optimal utilization system for this grassland.Together with a household survey,plant communities were investigated in S.grandis steppe with three utilization modes:annual mowing,annual grazing and seasonal rotational grazing.We calculated important values and diversity indices to analyze the relationship between plant diversity and biomass.It was found that,1)The dominant plant groups of S.grandis grassland under the three utilization modes were consistent.2)There was no significant difference in community species diversity among the three utilization methods,but there was significant difference in functional group species diversity.The species diversity of perennial grasses under mowing was higher than that under annual grazing and seasonal rotation grazing;the species diversity of shrubs and subshrubs under annual grazing was higher than that of annual grazing and seasonal rotation grazing.3)Above-ground standing crop of annual mowing and seasonal rotation grazing was significantly higher than that of annual grazing.4)There was a significant positive correlation between plant diversity and biomass under annual mowing and seasonal rotation grazing.In conclusion,mowing and seasonal rotation grazing maintained high species diversity while maintaining high above-ground standing crop,which is conducive to the sustainable use of S.grandis steppe,but the community structure of the two was different and therefore would support different ecosystem functions.