Cadmium bioavailability in surface soils receiving long-term applications of inorganic fertilizers and pig manure
文献类型： 外文期刊
作者： Wu, Longhua 1 ; Tan, Changyin 2 ; Liu, Ling 1 ; Zhu, Ping 3 ; Peng, Chang 3 ; Luo, Yongming 1 ; Christie, Peter 4 ;
作者机构： 1.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China
2.Hunan Normal Univ, Coll Resources & Environm Sci, Changsha 410081, Hunan, Peoples R China
3.Jilin Acad Agr Sci, Res Ctr Agr Environm & Resources, Gongzhuling 130124, Peoples R China
4.Agri Food & Biosci Inst, Agri Environm Branch, Belfast BT9 5PX, Antrim, North Ireland
关键词： Long-term field experiments;Pig manure;Mineral fertilizers;Soil cadmium;Feed additives
期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）
ISSN：
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收录情况： SCI
摘要： Long-term field experiments were established in 1990 at two sites, one in northeast (17 years) and the other in south China (16 years) to better understand the effects of pig manure and inorganic fertilizers on heavy metal accumulation in soil. Experimental treatments were NPK and SNPK (Straw + NPK) fertilizers and two application rates of pig manure plus NPK at the site in northeast China and NK, NP, NK and PK fertilizers and pig manure with and without PK in the south. Unamended control plots were included at both sites. Both application rates of pig manure with NPK in the northeast for 17 years increased concentrations of aqua regia extractable Cd in the topsoil by about 17.0- and 18.9-fold but repeated applications of straw for 17 years did not result in a marked accumulation of Cd in the surface soil. Similar results were found in the southern plots treated with pig manure (with or without NPK). The distribution patterns of DTPA-extractable Cd in the northeast (BSES) were similar to that of aqua regia-Cd. HCI-extractable Cd in the topsoil treated with pig manure (with or without NPK) in the south exceeded that in the control soil by about 4.5- and 5.4-fold (RSES). Sequential extraction results show that in the northeast pig manure from intensively managed pig farms led to accumulation of Cd in both exchangeable and reducible soil fractions. (C) 2011 Elsevier B.V. All rights reserved.
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