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Acta Scientiae Circumstantiae. 2014, (11) Core

In-situ remediation of Cd-polluted paddy soil by clay minerals and their effects on nitrogen,phosphorus and enzymatic activitiesChinese Full Text

HAN Jun;LIANG Xuefeng;XU Yingming;XU Yuanjian;LEI Yong;JIANG Ronghui;Key Laboratory of Reservoir Aquatic Environment,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences;Key Laboratory of Original Environmental Quality of MOA,Agro-Environmental Protection Institute,Ministry of Agriculture;Guiyang Agricultural Bureau;

Abstract: In-situ immobilization field demonstration of Cd-polluted paddy soil by palygorskite and sepiolite was conducted to investigate the immobilization effects according to a set of variables（grain yields and Cd concentration in brown rice;soil available Cd content,pH,hydrolyzable nitrogen,available phosphorus and soil enzymatic activities）.Results showed that the application of palygorskite and sepiolite could increase soil pH,reduce the bioavailability of Cd in soil and Cd concentration in brown rice.The addition of palygorskite（2.00 kg·m-2） and sepiolite（2.25 kg·m-2） significantly decreased Cd accumulation in brown rice by contents of 54.6% and 73.5%,and Cd contents in brown rice were reduced to 0.32 and 0.18 mg·kg-1,respectively.The changes in soil enzymatic activities proved that certain metabolic recovery occurred after immobilization.Palygorskite and sepiolite had no obvious effects on hydrolyzable nitrogen contents,but reduced soil available phosphorus contents.According to the overall performance,palygorskite and sepiolite can be applied as immobilization agents for Cd polluted acid paddy soil.
Keywords：

palygorskite; sepiolite; cadmium pollution; immobilization; hydrolyzable nitrogen; available phosphorus; enzymatic activity;

  • DOI：

    10.13671/j.hjkxxb.2014.0756

  • Series：

  • Subject：

  • Classification Code：

    X53

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