【摘要】 羊草草原经过 1 7年的割草 ,群落的地上和地下生物量及主要种群的重要值均受到了不同程度的影响 ,而羊草和 艹洽 草种群的变化尤其明显 .在不同频率割草的实验系列中 ,群落生物量和羊草种群的重要值随割草频率的增加而降低 .在不同时期割草的实验系列中 ,群落地下生物量随着割草时期的后移呈上升趋势 ,地上生物量和羊草种群重要值则是 8月份刈割受到影响较大 .艹洽 草种群重要值的变化趋势与羊草基本相反 .更多还原

【Abstract】 Under mowing for 17 years on the L.chinensis steppe,the community aboveground and underground biomass and the important value of major population were effected in different degree, especially L.chinensis and K.cristata population. Under the influence of mowing with different frequency, the community biomass and the important value of L.chinensis gradually declined with the increase of mowing frequency. Under the influence of mowing at different time, the community underground biomass rose with behind moving of mowing time.The aboveground biomass and the important value of L.chinensis come under bigger influence of mowing in August every year.The change tendency of K.cristata population was just right opposite to the L.chinensis.更多还原