密度对刺槐幼苗生物量及异速生长模式的影响  

Effects of Density on Biomass and Allometric Pattern of Robinia pseudoacacia Seedling

作　　者：安慧[1] 上官周平[1] 

机构地区：[1]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100

出　　处：《林业科学》2008年第3期151-155,共5页Scientia Silvae Sinicae

基　　金：国家科技支撑项目(2006BAD09B04);中国科学院西部行动计划项目(KZCX2-XB2-05);西北农林科技大学拔尖人才培养计划项目;创新团队项目资助

摘　　要：The aboveground and underground biomass and allometry relationship between plant height and stem diameter of Robinia pseudoacacia seedling under different planting density were studied. Experiments were designed for cultivated R. pseudoacacia seedling under different planting density (including row spacing 30 cm, and planting distance 15, 20, 25, 30 cm) in March 2005. The seedlings were watered and fertilized regularly to maintain growth under limited resources. At the beginning of September 2005, the seedling leaves, stems and roots were harvested and weighed separately to obtain the wet and dry biomass. The result showed that the biomass of roots, stems and leaves of R. pseudoacacia increased with planting distance increase under row spacing 30 cm. Ratio of root to shoot of R. pseudoacacia increased with planting distance increase, and was all less than 1 under different planting distance. Ratio of root to shoot of R. pseudoacacia was significant between planting distance 15 cm and other distances, but not significant among planting distance 20, 25 and 30 cm. The less effects of low density on aboveground biomass, underground biomass and resource utilization of R. pseudoacacia. The plant height and stem diameter of R. pseudoacacia seedling increased with planting distance increase (p<0.05). Under low density, there is no notable competition between individual plants, the relationship between height and stem diameter show simple allometry and form of its allometric equation is y=a+bx. However, under high density, there is strong intraspecific competition between individual plants, the relationship between height and diameter is nonlinear allometry and its allometric function can be expressed as y=ax^2+bx+c.The aboveground and underground biomass and allometry relationship between plant height and stem diameter of Robinia pseudoacacia seedling under different planting density were studied. Experiments were designed for cultivated R. pseudoacacia seedling under different planting density （including row spacing 30 cm, and planting distance 15, 20, 25, 30 cm） in March 2005. The seedlings were watered and fertilized regularly to maintain growth under limited resources. At the beginning of September 2005, the seedling leaves, stems and roots were harvested and weighed separately to obtain the wet and dry biomass. The result showed that the biomass of roots, stems and leaves of R. pseudoacacia increased with planting distance increase under row spacing 30 cm. Ratio of root to shoot of R. pseudoacacia increased with planting distance increase, and was all less than 1 under different planting distance. Ratio of root to shoot of R. pseudoacacia was significant between planting distance 15 cm and other distances, but not significant among planting distance 20, 25 and 30 cm. The less effects of low density on aboveground biomass, underground biomass and resource utilization of R. pseudoacacia. The plant height and stem diameter of R. pseudoacacia seedling increased with planting distance increase （p 〈 0.05）. Under low density, there is no notable 6ompetition between individual plants, the relationship between height and stem diameter show simple allometry and form of its allometric equation is y = a ＋ bx. However, under high density, there is strong intraspecific competition between individual plants, the relationship between height and diameter is nonlinear allometry and its allometric function can be expressed as y = ax^2 ＋ bx ＋ c.

关 键 词：密度 刺槐 生物量 简单异速生长 非线性异速生长 

分 类 号：Q948.12[生物学—植物学]