秦岭独叶草种群个体和构件生物量动态研究

Individual and modular biomass dynamics of Kingdonia uninflora population in Qinling Mountain.

对秦岭地区独叶草种群个体和构件生物量动态进行了系统研究 .结果表明 ,独叶草种群个体生长发育过程中构件生物量与年龄关系可用Logistic方程表示 .种群叶和芽的生物量比率随年龄增长降低 ,而根系和根状茎的生物量比率增加 .不同海拔地域的种群个体生物量和各构件生物量显著不同 (P <0 .0 5 ) ,海拔 2 70 0～ 2 90 0m的种群个体生物量和各构件生物量较低海拔和高海拔地区大 .叶生物量比率随海拔升高降低 ,而根状茎的比率却增加 .在较适生地域 ,根系生物量比率较低 ,而芽的比率较高 .种群个体生长和各构件生物量动态与环境条件关系密切 .

The individual and modular biomass dynamics of Kingdonia uninflora populations in Qinling Mountain were studied systematically.They could be expressed by Logistic equation. The ratio of leaf to bud biomass of population decreased with its increasing age ,whereas the ratio of the root system to the subterranean stem biomass increased. The individual and each modular biomass of different populations at different altitudes were significant different (P<0.05), which were larger at altitude 2700～2900m than at the lower and higher altitudes. The rate of leaf biomass decreased as altitude rose, whereas that of the subterranean stem increased. In the favorable area, the rate of root system biomass was less, whereas the bud biomass was bigger compared with other habitats. The individual growth and modular biomass accumulation were closely related to habitat condition.