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以三江源区玉树县和玛多县为研究区,利用实验室测定的As、Cu、Pb、Zn、Cr、Cd、Hg元素含量和室内采集的土壤原始光谱及其4种转换形式,建立了光谱指标与重金属含量的多元回归模型,利用决定系数(R2)、相对分析误差(RPD)及均方根误差(RMSE)评价模型的精度。研究结果表明,土壤As、Cu、Pb、Zn、Cr、Cd含量与SOM、Fe、Mn、Al、Mg等元素具有显著相关关系,Hg元素则未达到显著性水平。As、Cu、Pb、Zn、Cr和Cd元素估算模型回归方程R2达到了0.5以上,均通过了显著性检验,其中Pb、Zn和Cr元素验证样本RPD均达到了1.4以上,模型具备粗略估算能力;As、Cu和Cd元素验证样本RPD均低于1.4,模型不具备粗略估算能力。Hg元素估算模型回归方程的R2为0.28,未能通过显著性检验,无法用于对Hg含量的估算。
Taking the Yushu County and Maduo County as the research areas in the Three River Source Region, the contents of As, Cu, Pb, Zn, Cr, Cd and Hg in the laboratory and the original spectrum of soil collected in the laboratory and their four kinds of transformation were established (R2), relative analytical error (RPD) and root mean square error (RMSE) were used to evaluate the accuracy of the model. The results showed that the contents of As, Cu, Pb, Zn, Cr and Cd in soils had a significant correlation with SOM, Fe, Mn, Al, Mg and other elements, while Hg did not reach the significant level. The regression equation R2 of As, Cu, Pb, Zn, Cr and Cd estimated models reached 0.5 or above, both of which passed the significance test. The RPDs of Pb, Zn and Cr were all above 1.4, and the model had a rough estimation ability The RPDs for As, Cu and Cd were less than 1.4 and the model did not have the rough estimation ability. The R2 of regression equation of Hg element estimation model was 0.28, which failed to pass the significance test and could not be used to estimate Hg content.