Toward conditions favourable to mobility of trace elements in soils

摘要

These new results show clearly that in the absence of waterlogging, increasing the occurrence of high water contents, might be enough to deeply change trace-element mobility in soils. This might happen in newly intensively irrigated soils. In the long term, among potential impacts that are discussed as consequences of climate change, an increase in precipitation is often considered in many areas. This should also result in an increase in the occurrence and duration of high water contents in soils. In these different situations, increasing occurrence of high water contents will lead to new conditions that are favourable to mobility of trace elements. Thus, toxic trace elements immobilised in oxides and oxi-hydroxides should be released, with dramatic consequences for the surface water quality.