新疆雪岭杉生物量模型对比研究

A Comparative Study on Biomass Models for Picea schrenkianain Xinjiang

基于80株样木的实测数据,运用相关分析和回归分析方法构建了雪岭杉的地上部组织、地下部和各组分器官的生物量估测模型,并根据评价指标对比分析各种模型。结果表明:地上各部分生物量一元模型精度除树叶为77%,其他均在90%以上,可以满足大尺度森林生物量估计;地上各生物量二元模型拟合效果要优于一元模型,但是不同组分生物量模型适合的因子组合不同,地上生物量和树干生物量模型W=aDb Hc相对最优,预估精度97.38%和97.26%,树枝、树叶生物量模型W=a(D3/H)b最优,预估精度93.96%和90.37%;地下生物量模型以根茎比方程建立的一元模型最优,预估精度89.01%。建立的地上及各组分生物量模型和地下生物量模型可用于新疆天山山区雪岭杉生物量估计。

Based on the measured data of 80 sample trees, models that were used to estimate the biomass of the different parts of Picea schrenkiana were established and compared according to the evaluation index a-nalysis. The results showed that the precisions of the single-variable models for aboveground biomass esti- mation were over 900//00 except for that used for leaf biomass estimation （with a precision of 77%）, indicating that these models could be applied in large-scale-biomass estimation Binary models for aboveground bi- omass estimation were superior to single-variable models, however, optimum factor combinations were dif- ferent among the models. W= aDbHc was the best model for aboveground and trunk biomass estimation with estimation precisions of 97. 38% and 97.26%, respectively. For branch and leaf biomass, the best model was W= （Da/H）b, with estimation precisions of 93.96% and 90.37%, respectively. For the esti- mation of underground biomass, the single-variable model based on root-shoot ratio equation was the best, with a precision of 89.01%. The models established could be used for the biomass estimation of P. schren- kiana in Tianshan Mountain in Xinjiang.