几种荒漠植物地上生物量估算的初步研究

Estimation of aboveground biomass of desert plants

在调查植物样方的基础上 ,利用植株冠幅特征如冠幅长与宽、株高、基径、新生枝条数、总枝条数等作为变量建立了估算典型荒漠植物地上生物量的模型 .利用植株冠幅长与宽所建拟合方程对估算琵琶柴灌丛生物量的精确度较高 ,经验证 ,预测值与实测值的相关系数为 0 .9989,相对误差在 4 .79%～10 .12 %之间 .利用植株株高、基径所建拟合方程对估算梭梭、多枝柽柳生物量计算值与实测值的相关系数在 0 .94 18以上 ,显著性检验表明相关系数均为极显著 .经验证 ,预测值与实测值的相关系数分别为 0 .990 2和 0 .9875 ,相对误差分别为 6 .87%～ 19.2 2 %和 7.4 9%～ 18.4 7% .研究表明 ,在大面积荒漠植物生物量研究中 ,利用植株冠幅特征作为变量来估算琵琶柴灌丛地上生物量方法简便可行 ,用来估算梭梭、多枝柽柳等灌木地上生物量时存在一定误差 .

Based on the research of plant quadrate in Sangong River Basin in Xinjiang, the fitted equations were given, which could be used to estimate the aboveground biomass of typical desert plant by using the thicket characteristics such as length of crown diameter, width of crown diameter, number of basal branch, length of new branch, basal diameter ( D ) abstract and plant height ( H ) abstract as parameters. Using the length of crown diameter and the width of crown diameter as parameters, the fitted equation was set up and tested for estimating the aboveground biomass of Reaumuria soongorica Maxim. It had a relatively high accuracy and a fine linear relationship between the predicted values and measured values. Its coefficient and relative standard deviation was 0.9989 and 4.79%～ 10.12 %, respectively. The results indicated that the fitted equation was easy and available for estimating the aboveground biomass of Reaumuria soongorica Maxim in large scale. The fitted equations were also set up and tested for estimating the aboveground biomass of Haloxylon ammodendron and Tamarix ramosissima by using the basal diameter and height of plant as the parameters. The coefficients and relative standard deviations of these equations were 0.9902, 0.9875 and 6.87% ～19.22%, 7.49%～18.47%, respectively. Therefore, estimating the biomass of Reaumuria soongorica in large scale through crown characteristics was available, and estimating the biomass of Haloxylon Ammodendron and Tamarix ramosissima through crown characteristics would produce certain error.