Biochar protects hydrophilic dissolved organic matter against mineralization and enhances its microbial carbon use efficiency

文献类型： 外文期刊

第一作者： Zheng, Xiaodong

作者： Zheng, Xiaodong;Li, Xiang;Wei, Lan;Huang, Lianxi;Huang, Yufen;Huang, Qing;Liu, Zhongzhen;Singh, Bhupinder Pal;Singh, Bhupinder Pal;Chen, Xiangbi;Su, Yirong;Wang, Hailong;Wang, Hailong

作者机构：

关键词： C-13-labelled dissolved organic matter; Hydrophilia; Microbial incorporation; Biochar; Soil pH

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 795 卷

页码：

收录情况： SCI

摘要： A combination of biochar with exogenous organic material in soils is often used in practical farmland management. The objective of this study was to determine how biochar affects organic matter decomposition by studying the decomposition of C-13-labelled hydrophilic (Hi-) and hydrophobic (Ho-) dissolved organic matter (DOM) in acid and neutral soils during a 60-day incubation experiment. The proportions of carbon (C) mineralization in Hi-DOM with or without biochar addition were 32.6% or 34.5% in acid soil (P > 0.05) and 15.4% or 22.3% in neutral soil (P < 0.05), respectively. In contrast, those proportions of Ho-DOM-C mineralization with or without biochar addition were 20.0% or 21.4% in acid soil and 19.0% or 20.5% in neutral soil (P > 0.05), respectively. These results showed that biochar could protect Hi-DOM against mineralization in neutral soil but exhibited less effect on Ho-DOM mineralization in both acid and neutral soils. Additionally, biochar did not affect microbial incorporation of Hi- or Ho-DOM in acid and neutral soils. However, biochar notably improved the microbial carbon use efficiency (CUE) of Hi-DOM while it significantly reduced the CUE of Ho-DOM in neutral soil (P < 0.05), indicating that the effect of biochar on microbial CUE was related to organic matter type and soil pH. This study suggests that Hi-DOM can outperform Ho-DOM to decrease C loss and improve microbial CUE in neutral soil with biochar addition. This phenomenon could be due mainly to the different chemical compositions of Hi-DOM and Ho-DOM and their distinct microbial preference. These findings can provide references for biochar's ability to regulate the decomposition of organic matter. (C) 2021 Elsevier B.V. All rights reserved.

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