Cadmium Accumulation in Farmlands Through Deposition or Irrigation: Evidence from Multimedia Fate Modelling and Scenario Simulations

作     者：Liu, Yang Shi, Lin Zhang, Di Wang, Jing He, Liping Niu, Xuekui Pan, Bo 

作者机构：Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection College of Resources and Environment Linyi University Linyi276005 China Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China Yunnan Academy of Ecological Environment Sciences Kunming650034 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Irrigation 

摘      要：The evaluation of heavy metal pollution in farmland soil is of great significance for sustainable agriculture management. However, debate on the primary pollution migration pathways to crops has greatly retarded remediation strategies. Hence, the flux of heavy metals should be identified with precision for targeted pollution control. In this study, a catchment downstream of a metal mining area in Yunnan Province was selected for investigation of Cd pollution in the topsoil of farmlands, including the input and output fluxes in different environmental media. The results showed that Cd concentrations exceeded the risk screening value in 67.8% of the farmland soil samples. Irrigation was the main input source of Cd to soil, accounting for more than 75% of the total input fluxes, in which the contribution of dissolved Cd in water was 1–2 orders of magnitude higher than that of Cd adsorbed on suspension particles. Crop harvesting, surface runoff, and leaching were the main Cd output pathways from this area. Cd concentration in the studied area was also dynamically predicted in 2050 under different scenarios. The prediction showed that Cd in farmland soil in the study area would be in a cumulative state in the following years. Straw removing could significantly reduce Cd accumulation in farmland soil. Thus, the substantial increase of crop yield in the future would benefit Cd output flux through crop harvesting. This work will guide decision-making for the establishment of targeted remediation strategies for Cd pollution in farmland soil. © 2022, The Authors. All rights reserved.