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Effects of heavy metals on organic matter decomposition in inundated soils: Microcosm experiment and field examination.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-25 , DOI: 10.1016/j.scitotenv.2020.138223 Osim Enya 1 , Natalie Heaney 1 , Grace Iniama 2 , Chuxia Lin 3
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-25 , DOI: 10.1016/j.scitotenv.2020.138223 Osim Enya 1 , Natalie Heaney 1 , Grace Iniama 2 , Chuxia Lin 3
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Microcosm and field investigation were conducted to examine the effects of heavy metals on the decomposition and accumulation of organic carbon in contaminated Mersey estuarine floodplain, northwest England. The results show that inhibition of microbially mediated decomposition of organic matter occurred in the water-inundated soils. However, individual heavy metals had differential effects on the inhibition of soil organic matter decomposition with arsenic and copper being much stronger, as compared to other investigated heavy metals. The weak inhibitory effects of chromium on organic matter decomposition was due to the conversion of highly toxic Cr(VI) to less toxic Cr(III) under reducing conditions. Lead also had a weaker capacity to inhibit organic matter decomposition due to its low solubility. It was surprising that the same phenomenon was not clearly observed during the field examination. The inhibitory effects of heavy metals on soil organic matter decomposition could be curtained under field conditions. pH, Eh and EC played more important roles, as compared to soil-borne heavy metals, in affecting the soil carbon dynamics in the contaminated Mersey estuarine floodplain.
中文翻译：
重金属对淹没土壤中有机物分解的影响：微观实验和现场检查。
进行了微观和现场调查，以研究重金属对英格兰西北部受污染的默西河口洪泛区中有机碳的分解和积累的影响。结果表明，水淹没土壤中微生物介导的有机物分解受到抑制。但是，与其他研究过的重金属相比，单个重金属对土壤有机物分解的抑制作用不同，其中砷和铜要强得多。铬对有机物分解的抑制作用弱是由于在还原条件下高毒性的Cr（VI）转化为毒性较低的Cr（III）。铅由于其溶解度低而抑制有机物分解的能力也较弱。令人惊讶的是，在现场检查期间没有清楚地观察到相同的现象。在田间条件下，可以抑制重金属对土壤有机质分解的抑制作用。与受土壤污染的重金属相比，pH，Eh和EC在影响受污染的默西河口洪泛区的土壤碳动力学方面起着更重要的作用。
更新日期：2020-03-26
中文翻译：
重金属对淹没土壤中有机物分解的影响：微观实验和现场检查。
进行了微观和现场调查，以研究重金属对英格兰西北部受污染的默西河口洪泛区中有机碳的分解和积累的影响。结果表明，水淹没土壤中微生物介导的有机物分解受到抑制。但是，与其他研究过的重金属相比，单个重金属对土壤有机物分解的抑制作用不同，其中砷和铜要强得多。铬对有机物分解的抑制作用弱是由于在还原条件下高毒性的Cr（VI）转化为毒性较低的Cr（III）。铅由于其溶解度低而抑制有机物分解的能力也较弱。令人惊讶的是，在现场检查期间没有清楚地观察到相同的现象。在田间条件下，可以抑制重金属对土壤有机质分解的抑制作用。与受土壤污染的重金属相比，pH，Eh和EC在影响受污染的默西河口洪泛区的土壤碳动力学方面起着更重要的作用。
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