Water-washed hydrochar in rice paddy soil reduces N2O and CH4 emissions: A whole growth period investigation

文献类型： 外文期刊

第一作者： Chen, Danyan

作者： Chen, Danyan;Zhou, Yibo;Xu, Cong;Lu, Xinyu;Yu, Shan;Feng, Yanfang;Lu, Xinyu;Liu, Yang;Yu, Shan;Feng, Yanfang

作者机构：

关键词： Water-washed hydrochar; Global warming potential (GWP); Greenhouse gases (GHGs); Soil functional genes; Paddy soil

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2021 年 274 卷

页码：

收录情况： SCI

摘要： Hydrochar (HC), an environment-friendly material, enhances soil carbon sequestration and mitigate greenhouse gases (GHGs) emissions in croplands. In this study, the water-washed HC (WW-HC) was applied to paddy soil to investigate effects on nitrous oxide (N2O) and methane (CH4) emissions during rice growth period. Four treatments, namely control (without N fertilizer andWW-HC), N fertilizer (WW-HC00), N fertilizer with 0.5 wt% WW-HC (WW-HC05) and N fertilizer with 1.5 wt% WW-HC (WW-HC15), were established. Results showed theWW-HC addition reduced N2O and CH4 emissions, global warming potential (GWP) and greenhouse gas intensity (GHGI) during the growing season. Moreover, theWW-HC application reduced N2O cumulative emission (P < 0.05) (by 28.6% and 23.8% for WW-HC05 and WWHC15, respectively). It was mainly due to the reduced ratio of (nirK thorn nirS) to nosZ under WW-HC15 (P < 0.05). Compared with WW-HC00, the WW-HC05 reduced CH4 cumulative emissions by 14.8%, while the WW-HC15 increased by 9.7%. This might be ascribed to the significantly reduced expression of the methanogenic mcrA gene and ratio of mcrA to pmoA by WW-HC (P < 0.05). The WW-HC05 amendment decreased GWP and GHGI by 18.6% and 32.5%, respectively. Furthermore, the WW-HC application greatly improved nitrogen use efficiency by 116e145% compared with the control. Our study indicates the WW-HC application is a promising GHGs mitigation practice in paddy fields. (C) 2021 Elsevier Ltd. All rights reserved.

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