大针茅草原生物量动态与土壤贮水量关系模型的研究

Study on Relationship of Biomass Dynamic of plants and the Soil Water Capacity on Stipa grandis Grassland

根据植物生长规律,提出了1个适于半干旱地区的草原植物生长与水分关系的模型。模型中植物的生长动态与生长进程及水分条件呈指数关系,以中国科学院内蒙古草原生态系统定位研究站的资料为基础。对模型进行了验证,并给出了效果较好而又比较简单的可用于植物与土壤水分关系分析及估测植物现存生物量的具体模型。

Based on the analysis of plant growth, we suggest a plant growth model on the arid grassland: y=A+Bexp(F(t,w)) where A and B are constants, t is time, w is soil water capacity, F(t,w) represents functions about t and w with log(y). The results of regression analysis show: the dynamic of plant above—ground standing—biomass correlates well with exp(tw) or exp(tw,t^2w) on arid grassland, The following two forms of equation can be used in the analysis of plant growth dynamic and the relationship of plant growth with soil water: y=A+Bexp(C+D(tw)+E(t^2w)) and y=A+Bexp(F(t,w)) where A,B,C,D and E are constants, F(t,w) is a ploynomal of t and w, the power shows the highest power of the variable.