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根据塔里木河下游英苏至阿拉干断面各个监测井附近柽柳(Tamarix chinensis)标准枝生物量实测数据,采用数理统计方法构建柽柳单枝和单丛地上生物量估测模型,在精确度检验的基础上筛选出最佳模型,并对模型估测值与实测值进行卡方检验。结果表明:以柽柳枝基径d和枝长h派生因子d2 h为自变量建立的估测模型Ma=0.123(d2 h)1.241(R2=0.844)最优,估测精度为76.93%;分别以冠幅面积S和丛高H双变量SH、冠幅面积单变量S为自变量建立的柽柳地上生物量估测最优模型为Mb=1.335(SH)0.806(R2=0.788)、Mc=0.924S1.289(R2=0.771),估测精度分别为76.04%、72.83%。对上述模型估测值和实测值进行卡方检验,结果表明两者无显著差异,模型可用于塔里木河下游柽柳地上生物量估算。
Based on the measured data of standard shoot biomass of Tamarix chinensis near the monitoring wells in the lower reaches of the Tarim River from the Yingsu-Alashan section of the Tarim River, the mathematical model was established to estimate the aboveground biomass of Tamarix andronga, The best model was screened and chi square test was performed on the estimated and measured values of the model. The results showed that the optimal model was Ma = 0.123 (d2h) 1.241 (R2 = 0.844), and the estimation accuracy was 76.93%. The estimation accuracy was 76.93% with crown d and branch length h, The optimal model of tamarix was established by multivariate SH, breadth S and plexity H bivariate S, and crown area S as independent variable. The optimal models of aboveground biomass estimation of Tamarix was Mb = 1.335 (SH) 0.806 (R2 = 0.788) and Mc = 0.924S1. 289 (R2 = 0.771), the estimation accuracy is 76.04% and 72.83% respectively. The results of chi-square test on the estimated and measured values show that there is no significant difference between the two models. The model can be used to estimate the aboveground biomass of Tamarix elongatus in the lower Tarim River.