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| Effects of biochar application on content and characteristics of dissolved organic matter in arable land of purple soil |
| Received:December 01, 2016 |
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| KeyWord:purple soil;biochar;dissolved organic matter(DOM);fluorescence EEM;parallel factor analysis |
| Author Name | Affiliation | E-mail | | LIU Hui-yun | Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China
University of Chinese Academy of Science, Beijing 100049, China | | | XIAN Qing-song | Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China
University of Chinese Academy of Science, Beijing 100049, China | | | LIU Chen | Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China | chen1017@imde.ac.cn | | TANG Xiang-yu | Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China | |
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| Abstract: |
| This study characterized dissolved organic matter(DOM) in two typical arable lands of calcareous and neutral purple soil(dry land and vegetable field) that is abundantly distributed in Sichuan hilly area. Effects of biochar application(at rates of 0.5%~3.0%) on the concentration and composition of soil DOM was studied after three-months of dry-wet alternate aging process. The content and compositional characteristics of DOM were characterized by the concentration of dissolved organic carbon(DOC) and spectroscopic characteristics. Results show that concentrations of DOM extracted from calcareous and neutral purple soils are 43 and 65 mg DOC·kg-1 for dry land, and 110 and 105 mg DOC·kg-1 for vegetable field, respectively. Changes in DOM contents due to biochar application vary from soils. Aromaticity and the extent of humufication of DOM in the vegetable field soils are significantly higher than the dry land soils. Two humic-like components and one tryptophan-like component are identified using fluorescence excitation-emission matrix combined with parallel factor analysis(EEMs-PARAFAC). All of these components in vegetable field soils have higher intensities, aromaticity and humification degree than that of dry land soils. Biochar application pose no significant effects on the characteristics of soil DOM according to the results of spectroscopic analyses. |
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