黄柳地上生物量估测模型的构建

Construction of Aboveground Biomass Estimation Models of Salix gordejevii

为筛选出与生物量相关性显著、精度最高且拟合度最好的最优地上生物量估测模型,以赤峰敖汉旗北部沙地典型灌木黄柳(Salix gordejevii)为研究对象,利用6种函数和不同自变量来构建黄柳个体的地上生物量估测模型。结果表明:DH(纵断面周长)复合变量与黄柳地上生物量的相关性最显著,经精度检验(RS<30%;RM.A<20%)得出生物量的最优估测模型也是以DH为自变量的幂函数模型y=2.193x1.291(R2=0.915,P<0.001),与灌木常用的自变量D2 H(纵断面面积)作为生物量模型相比,精度较高。实际的应用中,在保证黄柳估测模型精度的情况下,建议以D为自变量对黄柳地上生物量模型进行构建。

In order to screening out optimal aboveground biomass estimation model with biomass significantly correlated,the highest accuracy and the best fitting degree, taking typical shrubs Salix gordejevii in Chifeng Aohan as research object,the individual Salix gordejevii aboveground biomass estimation model was construc- ted using 6 kinds of functions and different independent variables. The results showed that there was the most significant correlation between DH （longitudinal section girth）complex variables and Salix gordejevii aboveground biomass. Testing of the accuracy （Rs 〈30 %; RM.A 〈 20 %） obtained the best biomass estimation model was also based on DH as the independent variable power function model y= 2. 193x1＂ 2al （Rz = 0. 915, P〈 0. 001） which hasd high accuracy compared to used independent variables D2 H （longitudinal section area） shrub biomass models. Ensuring the accuracy of Salix gordejevii estimation model,D was recommended as the independent variable to build Salix gordejevii aboveground biomass model in practical applications,.