密度对小叶锦鸡儿播种苗生长的影响

对小叶锦鸡儿1年生播种苗密度效应的研究，目的在于揭示由各种密度所形成的种群个体之间相互作用的规律．对不同密度条件下的小叶锦鸡儿个体和群体的物候特性、生长状况、生物量积累和分配等方面做了研究.结果表明:密度对小叶锦鸡儿播种苗的物候特性及生长状况有一定的影响，随着密度增大，播种苗侧枝萌发的时间向后推移，侧枝数量逐渐减少．地上部分和地下部分的生长指标均随密度的增大而呈减小的趋势，多数生长指标各密度处理间的差异达到极显著水平．播种苗个体生物量随着密度的增大而减少，群体生物量则随着密度的增大而增加．播种苗单株根、茎、叶生物量分配比例为40％、35％和25％，单株根和茎的生物量分配比例随着密度的增大而减小，而叶的生物量分配比例则随着密度的增大而增加． 

Effects of density on seedling growth of Caragana microphylla Lam

Density effects of one year old Caragana microphylla seedlings were studied to reveal the interaction law among population's individuals formed in varied density. In the individuals and populations of C.microphylla,traits such as phonological traits,growing status,accumulation and allocation of biomass were studied under different density.Results showed that density had a certain effect on phenological traits and growing status of C.microphylla seedlings.The development of lateral branch germination retarded and the number of lateral branch decreased with the increase of density,and also,growth indicators above ground and underground all decreased,most of them reached an obvious level of the differences among different density treatments.Individual biomass decreased and population biomass increased with the increase of density.Individual biomass proportions of root, stem and leaf were 40%,35% and 25% respectively,and biomass proportions of root and stem decreased and that of leaf increased with the increase of density.