Journal of Food, Agriculture and Environment

Degradation risk evaluation of cultivated land in Jianghan Plain based on ecological risk analysis and GIS

Author(s):

Yan Nie ¹, Yi Luo ¹, Yuhao Qian ¹, Fang Chen ², Muxing Liu ¹, Jing Yu ²*

Recieved Date: 2012-02-10, Accepted Date: 2012-05-02

Abstract:

This paper aimed to use ecological risk analysis method to assess ecological degradation risk of cultivated land in Houhu Farm of Jianghan Plain in China. The results indicated that the pollution degrees of single factor followed the order of Cd>As>Cu>Zn>Dichlorodiphenyl-trichloroethane (DDT)>Hg>Cr>Pb>Hexachlorocyclohexane (HCH). Eight plots were slightly polluted by these pollutants, especially Cd was the primary heavy metal pollutant and DDT was the primary organic pesticide in this area. Of cultivated land 3.81% was slightly polluted and 15.59% was at the warning level. Based on the degradation risk evaluation models, the degree of degradation risk for cultivated land was classified into 4 levels, where small risk and average risk were predominant portions with their areas accounting for 83.1% of the total. Three evaluation plots of study area with high risk accounted for 5.01% of the total. The available phosphorus, accessibility of road and composite pollution index were the primary degradation risk factors and important issues of risk management for agriculture. The results can be used as a quantitative basis in evaluation of cultivated land quality and resolution of the soil degradation risk in this region. 

Keywords:

Land degradation, agriculture, environment pollution, heavy metal, risk model

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 1231-1236

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