【摘要】 研究了不同放牧强度对羊草草地的影响，结果表明，过牧条件下，群落地上、地下生物量分别比轻牧阶段下降了６７．９６和７５．００％，羊草种群根茎分蘖数和种子产量下降１．０和３．３％．极牧条件下，土壤有机质和水分含量分别下降到轻牧阶段的２１．１和６６．５％，而碱化度和全盐量却分别增加了１倍和８倍．更多还原

【Abstract】 Studies on the effect of different grazing intensities on A. chinense grasslands show that in comparing with light grazing, above-and underground biomass of the community is decreased respectively by 67. 96 and 75. 00%, and tillers number of root stocks and seed production of A. chinease are decreased by 1. 0 and 33X, under overgrazing condition.Under extreme grazing condition, soil organic matter and water content are decreased by 21. 1 and 66. 5%, and the alkalinity and total salt are increased by one and eight times,respectively.更多还原