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| Effects of long-term fertilization on the accumulation and availability of heavy metals in soil |
| Received:July 31, 2016 |
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| KeyWord:long-term fertilization;red paddy;accumulation of heavy metals;availability |
| Author Name | Affiliation | E-mail | | WANG Teng-fei | College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China | | | TAN Chang-yin | College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China | chytan@hunnu.edu.cn | | CAO Xue-ying | College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China | | | OUYANG Da | College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China | | | NIE Jun | Hunan Research Institute of Soil and Fertilizer, Changsha 410125 | | | WANG Bo-ren | Hengyang Red Soil Experimental Station of Chinese Academy of Agricultural Sciences, Qiyang 426100, China | | | HE Qi-hui | College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China | | | LIANG Yu-feng | College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China | |
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| Abstract: |
| In this study, the accumulation and availability of copper(Cu), zinc(Zn), lead(Pb) and cadmium(Cd) in the paddy soils and upland red soils from a long-term fertilization experimental station were analyzed systematically. The purpose of this study was to provide reliable and useful information for heavy metal pollution in agricultural soils under routine agricultural management. According to the present results,the concentration range of Cu,Zn and Pb in red paddy soil of different fertilizer treatments did not exceed the secondary value of Chinese soil environmental quality standards, while the range of Cd level in different fertilization treatments ranged from 0.49 to 1.04 mg·kg-1,all of which were over the secondary value. In the upland soil, Cu(34.6~88.3 mg·kg-1),Zn(79.4~173.7 mg·kg-1) and Pb(56.7~81.1 mg·kg-1) concentrations were determined, Cu concentrations in the organic fertilizer treatment higher than the secondary value. Cd concentrations ranged from 0.14 to 1.35 mg·kg-1,exceeding standard rate was 42.9%. Cd bioavailability in the upland soil with pig manure was(33.8%) higher than that in the pig-manure amended paddy soil(23.9%),while the highest Cd bioavailability was determined in the upland soil with chemical fertilizers(NP 14.8%). Taken together, long-term application of chemical fertilizer and straw incorporation had no obvious effect on the accumulation of heavy metals in paddy and upland soils, and decreased Cd bioavailability was attained with Ca fertilization. However, significant Cd accumulation and a higher Cd bioavailability has occurred as a result of the incorporation of pig manure into soils. |
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