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通径分析是区分相关和因果关系的一种统计方法,已被应用于土壤对重金属吸附的研究上.作者通过萨瑟兰和卡诺瓦两地的轮作试验,建立了通径分析模型,以评价土壤pH、CEC、OC和粘粒含量等对Cd、Cu、Ni、Pb和Zn吸附的影响.结果表明,土壤性质对金属吸附的直接影响为pH>OC>CEC.高尔瓦(Galva)萨瑟兰试验田土壤为细粉砂质弱发育潮湿软土,土壤pH对Cd(0.83)、Cu(0.93)、Pb(0.96)的直接影响达到十分显著的程度(P<0.01).威伯特(Webster)卡诺瓦试验田土壤为细粘壤弱发育湿润软土,其结果也证实了pH对吸咐Cd(0.93)、Cu(0.95)、Pb(0.85)有着显著影响.高尔瓦试验分析认为,土壤吸附的重金属与土壤的pH值之间存在着简单相关关系,其相关系数为Cd(0.64)、Cu(0.84)、Pb(0.84).威伯特试验中土壤吸附的重金属与土壤pH值的相关系数为Cd(0.82)、Cu(0.74)、Pb(0.62).通径分析和相关分析都说明土壤pH是影响土壤吸附Cd、Pb、Cu的首要因子.通径分析能够揭示高尔瓦土壤CEC对Ni的吸附(0.72)、OC对Pb的吸附(0.35)和威伯特土壤OC对Cd吸附(0.59)的三种关系,在相关分析中则受到掩盖.根据有机碳对Pb和Cd吸附的直接和 间接影响,提出了这种吸附以络合反应为主,其次为有机质的CEC位点吸附.
Path analysis is a statistical method to distinguish between related and causal relationships and has been applied to the study of soil adsorption of heavy metals.According to the rotation test in Sutherland and Canova, the path analysis model The effects of soil pH, CEC, OC and clay content on the adsorption of Cd, Cu, Ni, Pb and Zn were studied.The results showed that the direct effect of soil properties on the metal adsorption was pH> OC> CEC, The soil in Sutherland experimental soil was weak soft sandy soil with fine silty sandy soil, and the direct effect of soil pH on Cd (0.83), Cu (0.93), Pb (0.96) reached a very significant level (P <0.01) (Webster) Canova experimental soil is a soft clay with weakly developed weakly developed soils, and the results also confirm that pH has a significant effect on the adsorption of Cd (0.93), Cu (0.95) and Pb (0.85) It is considered that there is a simple correlation between soil heavy metals and soil pH, and the correlation coefficient is Cd (0.64), Cu (0.84), Pb (0.84) The correlation coefficients of the values were Cd (0.82), Cu (0.74), Pb (0.62). Both path analysis and correlation analysis showed that soil pH was affected by soil suction Cd, Pb and Cu. Path analysis showed that the adsorption of Ni by CEC (0.72), the adsorption of OC by Pb (0.35) and the OC by Cd adsorption (0.59) The correlation was obscured in the correlation analysis.According to the direct and indirect effects of organic carbon on the adsorption of Pb and Cd, it was proposed that the adsorption was dominated by the complexation reaction followed by the adsorption of the CEC site of the organic matter.