中文摘要：

间苗试验结果表明，黑麦草、鸭茅、鸭茅＋ 黑麦草３ 组禾草种群对白三叶种间竞争力及构型影响显著。用Ｗｉｌｓｏｎ的竞争指数及竞争平衡指数进行分析发现，黑麦草、鸭茅、鸭茅＋黑麦草３组禾草种群对白三叶的竞争指数分别为０．３２，０．４７和０．７１，禾草种群与白三叶之间的竞争指数及竞争平衡指数大小顺序均为鸭茅＋黑麦草＞鸭茅＞黑麦草。随着种间竞争指数的增加，白三叶构件密度、分枝密度、分枝强度、分枝角度及构件能量减少，节间长度明显增加，根及单位长度茎的能量分配及生殖分配下降。

英文摘要：

The result of experiment of plant thinning showed that the competition between three groups of grasses （Loliurn perenne , Dactylis glomerata , D. glomerata＋L, perenne）and Tri folium repens was significant, so was the effect of the competition on the architecture of T. repens. The order of competitive balance index were, D. glomerata＋L, perenne〉D, glomerata〉L, perenne so was the competitive index with the value of 0.32, 0.47, 0.71, respectively. With the increase of competitive index of grasses and T. repens, either density of architecture and branch, or branching intensity,branching angle and caloric content of T. repens decreased while the internode length increased significantly. The trend of change of energy allocation of root and stem of certain length was the same of that of the density of architecture.