Advancement in Researches on Effect of Atmospheric Deposition on Heavy Metals Accumulation in Soils and Crops

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Supported by the National Natural Science Foundation of China (No.41877512) , the Environmental Protection Research Project of Department of Ecology and Environment of Jiangsu Province (No.2018013) and the Key Science and Technology Demonstration Project of Jiangsu Province (No.BE2016812)

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    Focusing on the farmland soil-crop-atmosphere system in China, a review is presented in this paper of sources and spatial-temporal distribution of heavy metals, impacts of heavy metals atmospheric deposition on heavy metals accumulation in soils and crops and advancement in the researches in this aspect in recent years. Once entering the atmosphere, heavy metals would start to go back to the land in the form of atmospheric deposition, in which the heavy metals display a clear feature of spatio-temporal variation as affected comprehensively by a variety of natural and anthropogenic factors and environmental protection policies. In terms of temporal variation, heavy metals concentrations in the atmosphere are higher in winter than in the other seasons, and in the heating period than in the non-heating period, while in terms of spatial variation, they are higher in well-developed industrial areas than in the other areas, in cities based mainly on coal as fuel than in the other cities and in urban areas than in suburbs. Atmospheric deposition not only increases the contents of heavy metals in the soil, but also have certain direct and indirect impacts on crops. Heavy metals in the atmosphere enter the plant cells through stomata and accumulate in cell walls and vacuoles. Once accumulating to a certain level, the heavy metals would affect normal growth of the crop and/or bring about the risk of heavy metals overproof in crops, which is a hazard to agricultural safety production. In future studies, it is advisable to integrate traditional analytic methords with modern technologies, like spatial and geostatistical analysis, multiple isotope tracing, mathematical modeling and so on, in exploring heavy metals recylcing processes in the soil-crop-atmospheric system on a reginal scale under natural field conditions so as to provide a scientific basis for regional prevention and control of heavy metal pollution of farmland soils, for environment mnagement and for decision-making in these fields.

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LIU Peng, HU Wenyou, HUANG Biao, LIU Benle, ZHOU Yi. Advancement in Researches on Effect of Atmospheric Deposition on Heavy Metals Accumulation in Soils and Crops[J]. Acta Pedologica Sinica,2019,56(5):1048-1059.

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  • Received:October 31,2018
  • Revised:January 27,2019
  • Adopted:February 20,2019
  • Online: July 03,2019
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