关键词: 白刺, 乌兰布和沙漠, 地上生物量, 关系模型

Abstract: In the paper the aboveground part of Nitraria tangutorum was divided into four types, new branch, old branch Ⅰ, old branch Ⅱ and withered twig. The relationship model between the biomass and the branch height and(or) the ground diameter was established; the relationship between the total biomass and the individual biomass of aboveground parts or leaf area for different types was studied. The results showed that relationship between the total biomass (y) and the maximum branch height (H_m), the maximum ground diameter (D_m) of new branch could be expressed by equation y=a(D_m² H_m^b). The relationship between the total biomass (y) and H_m of old branchⅠor old branch Ⅱ could be expressed by y=aH_m^b. The relationship between the branch biomass and the total biomass could be expressed by y=aEXP(-bx^k). The relationship between the leaf biomass(or the leaf area) and the total biomass could be expressed by y=a+b(1-EXP(-kx)). Therefore, we have established the method of estimating and predicting the biomass of aboveground part of Nitraria tangutorum and leaf area for Wulan Buh desert.

Key words: Nitraria tangutorum, Wulan Buh desert, aboveground biomass, relationship model