Modelling mass balance of cadmium in paddy soils under long term control scenarios

Environmental Science. Processes & Impacts
Wenli FengHongzhen Ran

Abstract

A simple mathematical model on the basis of the mass balance principle was developed to simulate the long-term changes of Cd in paddy soils. The model predicted the dynamics of cadmium concentration in soils under six alternative control scenarios, including rice straw incorporation into fields (A), removing straw from fields (B), irrigating paddies with groundwater (C), reducing atmospheric Cd deposition (D), liming (E), and integrating measures (F), which were used for Cd contaminated paddy fields in the central subtropical areas of China. The uncertainty of parameters was analyzed using Monte Carlo methods. Scenario simulation results showed that atmospheric deposition was the main external source of Cd, contributing 70% of the total inputs, and plant uptake was an important output pathway, responsible for 92% of the total outputs. Removing straw from fields was more effective than other single control scenarios, and integrating measures were more effective in lowering Cd concentration in contaminated paddy soils. The Cd concentration in soils can meet the critical value (0.3 mg kg-1) in a low-level Cd contaminated paddy field (0.68 mg kg-1) with integrating measures through 40 years of cultivation. In the same case, a high-...Continue Reading

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Citations

Aug 9, 2019·Environmental Science and Pollution Research International·Kun LiuBing Chen
May 12, 2019·Environmental Science and Pollution Research International·Liqing XinWenxuan Xu
Aug 3, 2019·Environmental Science and Pollution Research International·Yuqin LiangZhenfen Xian
Apr 14, 2020·Environmental Science and Pollution Research International·Yun-He XieXiong-Hui Ji
Aug 17, 2021·Environmental Science and Pollution Research International·Xueqian ZhongThibault Sterckeman
Apr 19, 2020·Ecotoxicology and Environmental Safety·Wenli FengWenxuan Xu

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