【摘要】 以内蒙古鄂尔多斯毛乌素沙地优势灌从沙柳(Salix psammophila)为研究对象,利用其易测指标株高(H)和冠幅直径(D)作为变量,结合实地获取的沙柳地上生物量与地下根系生物量,进行回归分析构建沙柳生物量模型.通过综合对比分析各预测模型的判定系数(R2)、F检验和平均估算误差(AEE)等指标,筛选出沙柳最佳生物量估测模型.沙柳生物量的最优模型为:地上生物量WA=0.326(HD)1.831,地下(根系)生物量WR=0.343(HD)1.497,总生物量WT=0.72(HD)1.660.模型的建立为毛乌素沙地沙柳群落生物量的测定提供了一种简便、实用的方法.更多还原

【Abstract】 Salix psammophilais the dominant shrub in Maowusu sandland at Ordos.In current study,the plant height(H)and crown diameter(D)of Salix psammophila were measured,combined with above-ground biomass and root biomass,to conduct regression analysis and establish biomass estimating models.Then the determine coefficient(R2),F test results and average estimated error(AEE)of each estimating model were compared to get the optimum ones,which were:1)above-ground biomass WA=0.326(HD)1.831;2)under-ground biomass(root)biomass WR=0.343(HD)1.497;3)total biomass WT=0.72(HD)1.660.These models provide a simple but practicable method to measure the community biomass of Salix psammophilain Maowusu sandland.更多还原