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作 者 ：包国章,李向林,白静仁

期 刊 ：生态学报 2000年 20卷 5期 页码：779~783

关键词：白三叶；放牧；斑块质量；密度；分枝格局；

Keywords:Trifolium repens, grazing, patch quality, density, branching pattern,

摘 要 ：对白三叶长期禁牧草地及土壤斑块质量不同的春季休牧草地的研究结果显示 ,4月份 ,在中等放牧强度草地上 ,约有 76.5%～ 80 .4 %的白三叶植株为茎部出现断折的残株 ,放牧草地植株密度明显高于对照草地。放牧草地较好的土壤营养条件使白三叶单株构件数量明显上升 ,但使分枝强度略有下降。白三叶各构件密度之间存在显著正相关。不同样地上白三叶的分枝均以 2、3级分枝为主。放牧草地的分枝角度大小顺序为 :1级分枝角 >2级分枝角 >3级分枝角 ;对照草地为 :2级分枝角 >3级分枝角 >1级分枝角。放牧及对照草地白三叶平均分枝角分别为 73 .0°、4 6.5°。

Abstract:Population density and branching pattern of T.repens was studied on ungrazed and grazed swards with different soil conditions.The percentage of the stem severed plants of T.repens was 76.5%～80.4%.Compared with the sward ungrazed,the swards moderately grazed keeped a higher densities of plant,leaf and stem,and lower number of leaf and the length of stem.The number of modules per plant increased while the branching intensity of T.repens decreased on the sward under better soil conditions.There w...

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