Abstract: In order to clarify the recognition and biological response strategies of Stylosanthes guianensis ‘Reyan No. 2’ to different neighbor plants,this experiment was conducted to study the growth changes of S. guianensis ‘Reyan No.2’ when it was respectively grew adjacent to 10 plant species belonging to four genetic treatment groups:self,close relative,distant relative and non-relative. The results showed that the relative relationship had no significant effects on the mean plant height and branch number of S. guianensis ‘Reyan No.2’. Compared with the self-treatment group,the mean values of total biomass and aboveground biomass in the close-relative treatment group increased significantly,while the mean value of root-shoot ratio decreased significantly (P<0.05). The mean values of root length,root-shoot ratio and biomass of the distant relative treatment group and the non-relative treatment group significantly decreased (P<0.05),but the mean value of the number of lateral roots significantly increased (P<0.05). The changes of each growth index combined with the results of principal component analysis showed that when S. guianensis ‘Reyan No.2’ neighbored with S. guianensis ‘Reyan No.21’,S. guianensis ‘Reyan No. 24’,S. guianensis ‘Reyan No. 5’ and Bidens pilosa,respectively,the growth of the aboveground part significantly enhanced,and the degree of response weakened in order. When S. guianensis ‘Reyan No. 2’ neighbored with S. scabra,S. gracilis,Cenchrus echinatus,Tridax procumbens and S. grandifolia, respectively,the growth of aboveground and underground parts became worse,and the degree increased in order. These results indicated that the aboveground growth of S. guianensis ‘Reyan No. 2’ was relatively strong when its close relative was its neighbor,and the aboveground and underground growth was weak when its distant relatives and non-relatives were its neighbor.

Key words: Neighbor recognition, Response strategy, Number of lateral root, Number of branch, Biomass distribution

摘要： 为明确‘热研2号’柱花草(Stylosanthes guianensis ‘Reyan No. 2’)对邻近植物的识别与生物响应对策，研究了其分别与自我、近亲、远亲和非亲4个亲缘关系组的10种植物伴生时的生长情况。结果表明：亲缘关系对‘热研2号’柱花草的株高和分枝数均值无显著影响，但近亲组伴生使其总生物量和地上生物量均值显著增加而根冠比均值显著减小(P<0.05)，远亲和非亲组伴生使其根长、根冠比、生物量均值均显著降低而侧根数均值显著增加(P<0.05)。生长指标变化结合主成分分析表明：与‘热研21号’(S. guianensis ‘Reyan No. 21’)、‘热研24号’(S. guianensis ‘Reyan No. 24’)、‘热研5号’(S. guianensis ‘Reyan No. 5’)和鬼针草(Bidens pilosa)为邻株时，‘热研2号’柱花草的地上部生长显著增强，且程度依次减弱；与西卡柱花草(S. scabra)、细茎柱花草(S. gracilis)、蒺藜草(Cenchrus echinatus)、羽芒菊(Tridax procumbens)和大叶柱花草(S. grandifolia)为邻株时，其地上部和地下部生长均变差，且程度依次增强。说明‘热研2号’柱花草与近亲缘品种伴生时地上部生长相对较强，与远亲缘和非亲缘种伴生时地上、地下生长均减弱。

关键词: 邻居识别, 响应策略, 侧根数, 分枝数, 生物量分配