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| Effects of Different Livestock Manures Combined with Chemical Fertilizers on Contents and Fractions of Zn in Black Soil |
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| KeyWord:livestock manure; Zn; transformation; black soil |
| Author Name | Affiliation | | YANG Zi-yi | College of Resources and Environment Sciences, Jilin Agricultural University, Changchun 130118, China | | WU Jing-gui | College of Resources and Environment Sciences, Jilin Agricultural University, Changchun 130118, China | | FENG Na-na | College of Resources and Environment Sciences, Jilin Agricultural University, Changchun 130118, China | | CHEN Chuang | College of Resources and Environment Sciences, Jilin Agricultural University, Changchun 130118, China |
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| Abstract: |
| Applying livestock manures has resulted in accumulation of heavy metals in soils. Impacts of heavy metals on the eco-environment are greatly dependent on their forms. Here a 3-year incubation experiment was conducted to study the effects of different livestock manures combined with chemical fertilizers on the dynamics of contents and forms of Zn in black soil. Modified BCR sequential extraction procedure was used to fractionate Zn forms. Combined applications of manures and chemical fertilizers increased the contents of total Zn and Zn fractions. Total Zn in the pig manure plus chemical fertilizer treatment was 1.69 times as much as that in the chemical fertilizers only, and each fraction of soil Zn was increased by an average of 238.9%. The combined application also led to a transformation of Zn from low bioavailability fractions（Organic matter fraction and Residual fraction） to high bioavailability fractions（Weak acid soluble and Reducible fractions）. The degree of Zn transformation was in order of pig manures>chicken manure>cow manure/fertilizers only. No mater fertilization or not, soil pH and organic matter contents were significantly negatively correlated with weak acid soluble and reducible fractions, but positively with organic and residual fractions of Zn. Combined applications enhanced the positive correlation between residual fraction and pH, but had no effects on the correlation between Zn fractions and organic matter contents. Therefore, the combined application of manures and chemical fertilizer caused accumulation of Zn and improved the bioavailability of Zn, thus increasing the risk of soil pollution, with pig manure having the greatest impact on Zn pollution. |
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