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《China Environmental Science》 1998-02
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The models of agro-ecological regulation and safe efficient utilization of farmland polluted by cadmium.

Wang Kairong,Chen Chaoming,Gong Huiqun,Wan Jiwu,Zhang Geli(Changsha Institute of Agricultural Modernization, Chinese Academy of Sciences,Changsha 410125)  
猅raditional controlling strategy of Cd pollution usually aims at improving and cleaning up the environment and restoring the soil quality. In this paper, an agro-ecological regulation strategy is put forward in view of efficient utilization of polluted farmland, i.e., taking the polluted farmland soil as a special resource and put it into a safe high efficient utilization again in agriculture domain by finding and using Cd-tolerant species.The amelioration and cleaning up of the farmland are made in the process of soil utilization. A case study of successful amelioration and utilization of a 40 hm~2 Cd-polluted farmland in a uranium mining area is introduced. It cut off further pollution of soil by irrigation and got rid of Cd pollution in food chain and finally restored the farmland productivity by selecting a mulberry-silkworm production model instead of the cereal cropping system. The mean annual output value of the farmland increased 2880 yuan/hm~2 than the rice cropping system and 8880 yuan/hm~2 higher than the maize cropping, while the profit and tax increased 1980 yuan/hm~2 and Cd level in the ploughed horizon decreased 1.33mg/kg annually. Moreover, Cd distribution in mulberry and its effects on mulberry growth and cocoon and silk quality are also reported.
【Fund】: 中科院“八五”重点课题及湖南省环境工程研究项目
【CateGory Index】: X171
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