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作 者 ：包国章,康春莉,李向林

期 刊 ：生态学报 2002年 22卷 8期 页码：1362~1366

关键词：放牧；生殖分配；千粒重；

Keywords:grazing, reproductive allocation, thousand grain weight,

摘 要 ：不同放牧强度对白三叶、红三叶、鸭茅的生殖分配及种子千粒重影响极显著。一定强度的放牧干扰有利于提高休牧后三叶草的花序密度 ,但鸭茅花序密度却随放牧强度的提高而出现明显下降。放牧草地三种牧草种群的生殖分配均低于对照草地。在放牧草地 ,随放牧强度的提高 ,白三叶生殖分配逐渐增加 ,红三叶及鸭茅生殖分配逐渐减少。提高放牧强度后 ,三叶草千粒重出现递减趋势 ,而鸭茅却出现递增趋势 ,在无放牧干扰草地 ,三叶草种群趋于生产数量较少的大粒种子 ,在放牧干扰下 ,趋于生产数量较多的小粒种子 ;鸭茅种群则出现相反的变化。

Abstract:On the artificial grassland of middle high mountainous region of China, the stocking intensity was strictly controlled at three levels according to intake rates: G1(55%)、G2(65%) and G3(80%). Field experiment results showed that there was significant relationship between stocking intensity and the reproductive allocation( RA ), grain weight of T. repens, T. pratense and D. glometata . Inflorescence density of clover increased after medium intensity stocking(G1 or G2)while there was a significant n...

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