期刊
CHEMOSPHERE
卷 186, 期 -, 页码 986-993出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.08.074
关键词
Biochar; Dissolved organic matter; Wheat-maize rotation; Loess Plateau
资金
- National Science Foundation of China (NSFC) [51508466, 41301305]
- Fundamental Research Funds for the Central Universities [2452016067]
Biochar amendment in soil has the potential to sequester carbon, improve soil quality and mitigate greenhouse gas (GHG) emission in agriculture, but the impact of biochar amendments on dissolved organic matter (DOM) properties of soils in the fertilized agro-ecosystem has received little research attention. This study performed a long-term field experiment to assess the influence of biochar amendments (different addition rate: 4 t ha(-1) and 8 t ha(-1)) on DOM characteristics in soils in wheat maize rotation system in Loess Plateau of China by exploiting fluorescence excitation-emission spectrophotometry and parallel factor analysis (EEM-PARAFAC). Our results showed that the content of soil DOM was significantly influenced by the addition of biochar, and the higher biochar addition markedly increased the mean concentration of dissolved organic carbon (DOC) (from 83.99 mg kg(-1), to 144.27 mg kg(-1)) in soils under the same fertilizer application. Three identified fluorescent components (fulvic acid-like, humic acid-like and tryptophan-like) were found, and fluorescence intensity of those components (especially humic-like material) was enhanced with the increasing DOC in the biochar treatments but the composition of DOM was not changed. These findings would be beneficial to understand the biochar's effects and processes in decreasing GHG emissions from soils. (C) 2017 Elsevier Ltd. All rights reserved.
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