Assessment of heavy metal pollution and bearing capacity estimation of continuous biogas slurry application on cropland: A case study of the coastal rice-wheat rotated farmland in Jiangsu, China
TANG Yi-fan1,2, WANG Ling-yu1, WU Dan3, DAI Cheng3, HAN Jian-gang1,2
1. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China;
2. Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province, Nanjing Forestry University, Nanjing 210037, China;
3. COFCO Meat(Jiangsu) Co., Ltd, Dongtai 224200, China
In order to evaluate the pollution risk and estimate the bearing capacity, the coastal rice-wheat rotated farmland in Jiangsu Province was studied to investigate the effects of biogas slurry application for 0, 3, and 5years on heavy metal (Cu, Zn, Pb, Cd) contents in soil and crop grains. Cu, Zn, Pb, and Cd contents in soil and crop grains did not exceed the national standard limits after 3 and 5years of biogas slurry application, and the degree of heavy metal pollution in farmland met the requirements of cleaning according to Nemerow index and the Influence Index of Comprehensive Quality. The Cu and Zn contents in soil enriched significantly after 5years of application of biogas slurry and the contents of Cu and Zn in wheat and rice season were 22.59 and 63.08mg/kg (26.12 and 78.74mg/kg), which were 19.52% and 28.89% (27.73% and 31.80%) higher than those grains without application. As the increasing of application age of biogas slurry, the content of Zn in crop grains increased significantly (P<0.05) and the Zn contents in wheat and rice grains reached up to 25.07 and 30.98mg/kg after 5years of biogas slurry application, which was 23.50% and 16.29% higher than those grains without application. The accumulation rate of Cu and Zn in soil (0~15cm depth) was 0.74mg/(kg·a), 2.83mg/(kg·a) and 1.13mg/(kg·a), 3.80mg/(kg·a) for wheat and rice season, respectively. Based on the accumulation rate of heavy metals in soil, the safe application period of biogas slurry in coastal rice-wheat rotated farmland was 63years.
汤逸帆, 汪玲玉, 吴旦, 戴成, 韩建刚. 农田施用沼液的重金属污染评价及承载力估算——以江苏滨海稻麦轮作田为例[J]. 中国环境科学, 2019, 39(4): 1687-1695.
TANG Yi-fan, WANG Ling-yu, WU Dan, DAI Cheng, HAN Jian-gang. Assessment of heavy metal pollution and bearing capacity estimation of continuous biogas slurry application on cropland: A case study of the coastal rice-wheat rotated farmland in Jiangsu, China. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1687-1695.
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