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| Accumulation and potential ecological risk assessment of heavy metals in greenhouse soils from coastal area of Jiangsu Province |
| Received:January 24, 2016 |
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| KeyWord:coastal area;greenhouse soil;heavy metal;bioavailability;ecological risk |
| Author Name | Affiliation | E-mail | | YAO Rong-jiang | State Key Laboratory of Soil and Sustainable Agriculture(Institute of Soil Science, Chinese Academy of Sciences), Nanjing 210008, China
Dongtai Institute of Tidal Flat Research, Nanjing Branch of the Chinese Academy of Sciences, Dongtai 224200, China | | | YANG Jin-song | State Key Laboratory of Soil and Sustainable Agriculture(Institute of Soil Science, Chinese Academy of Sciences), Nanjing 210008, China
Dongtai Institute of Tidal Flat Research, Nanjing Branch of the Chinese Academy of Sciences, Dongtai 224200, China | jsyang@issas.ac.cn | | XIE Wen-ping | State Key Laboratory of Soil and Sustainable Agriculture(Institute of Soil Science, Chinese Academy of Sciences), Nanjing 210008, China | | | WU Dan-hua | Dongtai Institute of Tidal Flat Research, Nanjing Branch of the Chinese Academy of Sciences, Dongtai 224200, China | | | YU Shi-peng | State Key Laboratory of Soil and Sustainable Agriculture(Institute of Soil Science, Chinese Academy of Sciences), Nanjing 210008, China
Dongtai Institute of Tidal Flat Research, Nanjing Branch of the Chinese Academy of Sciences, Dongtai 224200, China | | | ZHANG Xin | State Key Laboratory of Soil and Sustainable Agriculture(Institute of Soil Science, Chinese Academy of Sciences), Nanjing 210008, China
Dongtai Institute of Tidal Flat Research, Nanjing Branch of the Chinese Academy of Sciences, Dongtai 224200, China | |
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| Abstract: |
| Greenhouse soils have different biogeochemical characteristics from natural soils. Therefore, it is important to reveal the accumulation and ecological risks of soil heavy metals for sustainable production of greenhouse soil. This study was carried out to examine the effects of cropping methods and greenhouse ages on the total and bioavailable content of soil heavy metals(Pb, Cr, Cd, As), in a coastal greenhouse area in Jiangsu Province, China, a rapid development area of high-efficiency agriculture. Results indicated that soil environmental quality across the greenhouse area was generally in good condition. Except Pb whose content exceeded the environmental quality standard for farmland of greenhouse vegetables production(HJ/T 333-2006), the content of Cr, Cd and As was lower than the environmental quality standards. Cropping methods and greenhouse ages affected the total and bioavailable content of soil heavy metals to a different extent. Total and bioavailable concentrations of Pb, Cr and Cd in greenhouse soil was significantly higher than those in conventional field. The total and bioavailable content of Cd exhibited the trend of accumulation with increasing greenhouse ages. The bioavailable Pb, Cr, and Cd in soil showed significant negative correlations with soil clay particle content, cation exchange capacity, and pH, but positive correlations with soil organic matter. The bioavailable As was merely positively correlated with soil pH. The comprehensive potential ecological risks of heavy metals were currently at a low level across the whole greenhouse area. The indexes of the comprehensive potential ecological risks in different crop greenhouses were in order of green pepper > watermelon > Chinese chives, increased with increasing greenhouse ages. The research findings could provide scientific reference for pollution source reduction, ecological activity control and risk prevention of soil heavy metals in the coastal greenhouse area. |
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