以古尔班通古特沙漠梭梭(Haloxylon ammodendron)为研究对象,采用基径(D)和株高(H)的组合D2H为变量,建立了沙质、盐土和石砾质3个生态类型梭梭地上生物量、基径≥3 cm的粗枝生物量及基径<3 cm细枝生物量的预测模型.结果表明:梭梭地上生物量、粗枝生物量及细枝生物量与基径平方乘高(D2H)之间存在极为显著的相关关系;地上生物量在3种生态类型上均表现出与乔木树种类似的相对生长规律,其估测模型以幂函数方程最优;粗枝和细枝生物量在沙质生态类型上以幂函数方程最好,而在盐土和石砾质生态类型上则以二次多项式方程最佳;各模型回检的拟合精度都在85%以上,预测精度较可靠.%The aboveground biomass and biomass of the stems with the diameter of≥3 cm and the stems with the diameter of ＜3 cm of Haloxylon ammodendron in 3 ecotypes of Gurbantunggut Desert were investigated by using the D2H as variable (basal diameter D and plant height H). The fitted estimation models were established. The results showed that the aboveground, thick branch and thin branch biomass of H. ammodendron were closely correlated with D2H. The aboveground biomass manifested the relative growth law similar to that of tree, and the power equation was suitable as the estimation model. To estimate the thick and thin branch biomass, the power equation was the best in sand ecotype, and the quadratic polynomial equation was the best in salt and gravel ecotypes. The simulating precision of these models exceeded 85 ％, and they had a relatively high assess accuracy.
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