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作 者 ：郭继勋,祝廷成

期 刊 ：生态学报 1994年 14卷 3期 页码：255~259

关键词：羊草草原；枯枝落叶积累；放牧；割草。；

Keywords:Leymus chinensis grassland, litter accumulation, grazing, grass cutting.,

摘 要 ：在自然状态下，羊草草原枯枝落叶积累季节动态是积累量从５月出现，随着时间推移呈指数形式递增，１０月末出现最大值。当枯枝落叶输入量和分解速率保持恒定时，积累量的年变化，随着时间的进展不断增加，最后达到稳定状态，量大积累量为５７２ｇ／ｍ￣２，达９５％稳定状态时间约为７─８ａ。放牧对枯枝落叶积累有明显的抑制作用，当放牧强度达７．５８羊（只）／ｈｍ￣２时，积累量比非放牧区减少近７４％。割草对枯枝落叶积累的影响也是显著的，随着割草频度增加，积累量明显减少，当一年内刈割３次，积累量减少８３％。刈割时间对积累量的影响表现在割草期的早晚，伴随刈割时间推迟，积累量逐渐减少。

Abstract:nder natural conditions,the seasonal dynamics of litter accumulation in a Leymus chi-nensis grassland was found to be in such a way that the litter accumulation started with May,then was increasing exponentially over time,and reached a maximum value by the end of Oc-tober.If the input and decomposition rates of litter were kept constant,the annual accumu-lation would be increasing continuously over time and would finally reach a steady state,with a maximum accumulation of 572g/m￣2,95%of which would take abo...

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