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Assessment of the selected trace metals in relation to long-term agricultural practices and landscape properties

机译:评估与长期农业实践和景观特性相关的选定微量金属

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Understanding of the landscape response to agricultural practices mainly in relation to soil trace metals requires particular attention. Consistent with this, the trend and possible pollution of total and DTPA fraction of Mn, Zn, Cu, and Cd in the agricultural soils developed on different landscape positions involving piedmont alluvial plain (PAP), river alluvial plain (RAP), plateau (PL), and lowland (LL) were investigated. The content of the metal in different soil profiles, grouped by landscape positions, varied in the following orders: total and DTPA-Mn as LL > PAP > RAP > PL, total Zn and Cu as PAP > RAP > LL > PL, total Cd as RAP > PAP > PL > LL, DTPA-Zn as RAP > PAP > PL > LL, and DTPA-Cu as RAP > LL > PL > PAP. A wide variation in the total fraction of Mn (89-985 mg kg(-1)), Zn (24-152 mg kg(-1)), Cu (8-27 mg kg(-1)), and Cd (0.6-1.7 mg kg(-1)) and in the DTPA fraction of Mn (1.2-11 mg kg(-1)), Zn (0.3-4.4 mg kg(-1)), Cu (0.3-3 mg kg(-1)), Cd (0.03-0.09 mg kg(-1)) observed as a result of the effects of agricultural practices and landscape properties. The values of both total and DTPA-extractable Mn, Zn, and Cu were enriched in the AP horizon probably due to anthropogenic activities particularly successive use of agrochemical compounds and manure during numerous years. Using soil pollution indices [single pollution (PI) and comprehensive pollution (PIN)], the study soils were categorized mainly as low to moderate pollution and Zn was identified as the major element affecting on the yield of these indices.
机译:需要特别关注对景观的响应(主要涉及土壤微量金属)对农业实践的响应。与此相一致的是,在涉及山前冲积平原(PAP),河冲积平原(RAP),高原(PL)的不同景观位置上发展的农业土壤中锰,锌,铜和镉的总量和DTPA分数的趋势以及可能的污染)和低地(LL)进行了调查。按景观位置分组的不同土壤剖面中的金属含量按以下顺序变化:总和DTPA-Mn为LL> PAP> RAP> PL,总锌和铜为PAP> RAP> LL> PL,总Cd如RAP> PAP> PL> LL,DTPA-Zn如RAP> PAP> PL> LL,而DTPA-Cu如RAP> LL> PL> PAP。 Mn(89-985 mg kg(-1)),Zn(24-152 mg kg(-1)),Cu(8-27 mg kg(-1))和Cd( 0.6-1.7 mg kg(-1))和DTPA中的Mn(1.2-11 mg kg(-1)),Zn(0.3-4.4 mg kg(-1)),Cu(0.3-3 mg kg( -1)),Cd(0.03-0.09 mg kg(-1))是由于农业实践和景观特性的影响而观察到的。在AP层中,总的和DTPA可提取的Mn,Zn和Cu的值均富集,这可能是由于人为活动引起的,尤其是多年来连续使用农药和肥料。使用土壤污染指数[单一污染(PI)和综合污染(PIN)],将研究土壤主要分类为中低污染,而锌被确定为影响这些指标产量的主要元素。

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