内蒙古敖汉旗北部风沙土区两种灌木地上生物量估算模型

Aboveground Biomass Estimation Model of Two Shrubs to Aohan Banner Northern Wind-sandy Area in Inner Mongolia

以内蒙古赤峰敖汉旗北部风沙土区两种主要灌木(黄柳、小叶锦鸡儿)为研究对象,利用不同函数和自变量来构建植株个体的地上生物量估测模型,筛选出与生物量相关性最显著、拟合度最好的地上生物量估测模型。研究结果表明:两种典型灌木的最优生物量回归方程均为幂函数方程。判定系数R^2为0.626~0.915,SEE值为0.179~0.508,F检验达到显著性水平,黄柳以断面周长(DH)为自变量的模型最优,模型为y=2.193x^(1.291)(R^2=0.915,p<0.01);小叶锦鸡儿则以冠幅(S)为自变量建立的幂函数模型最佳,为y=0.008x^(2.349),(R^2=0.878,p<0.01)。由于灌木的生长状况具有空间异质性,在其他研究区使用该模型时需要精度的检验和校正。

Taking two main shrubs （Salix gordejevii, C. microphylla） in Aohan, Chifeng as the research object. To construct the plant individual aboveground biomass estimation model using different functions and different independent variables. Screening out optimal aboveground biomass estimation model, which was biomass significantly correlated, and the best fitting degree. Results showed that, optimal biomass regression equation for the two typical shrubs was a power function equation. Determination coefficient R2 range was 0. 626 - 0. 915, SEE value range was 0. 179 - 0. 508, F test to achieve significant level, Salix gordejevii to DH as optimal model of independent variable, model was y = 2. 193x1..91 , （ R2 = 0.915, p 〈0.01） ; C. microphylla to S as optimal model of independent variable, model was y = 0. 008x2.349 , （ R2 =0. 878, p 〈0. 01）. As the growth condition of shrubs with a spatial heterogeneity, using the model required accuracy testing and calibration in any other study areas.