Clay-hydrochar composites mitigated CH4 and N2O emissions from paddy soil: A whole rice growth period investigation
文献类型： 外文期刊
作者： Li, Detian 1 ; Li, Huiting 3 ; Chen, Danyan 1 ; Xue, Lihong 1 ; He, Huayong 1 ; Feng, Yanfang 1 ; Ji, Yang 7 ; Yang, Linz 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Minist Agr & Rural Affairs Peoples Republ China, Key Lab Agroenvironm Downstream Yangtze Plain, Nanjing 210014, Peoples R China
2.Jiangsu Acad Agr Sci, Key Lab Crop & Anim Integrated Farming, Minist Agr & Rural Affairs,Inst Agr Resources & E, Minist Agr & Rural Affairs Peoples Republ China, Nanjing 210014, Peoples R China
3.Anhui Univ Sci & Technol, Sch Earth & Environm, Huainan 232001, Peoples R China
4.Jinling Inst Technol, Coll Horticulure, Nanjing 210038, Peoples R China
5.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China
6.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Jiangsu, Peoples R China
7.Nanjing Univ Informat Sci & Technol, Coll Appl Meteorol, Nanjing 210044, Peoples R China
8.Univ Tokyo, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
关键词： Greenhouse gas; Hydrothermal carbonization; Kaolinite-hydrochar composite; Functional gene
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 780 卷
页码：
收录情况： SCI
摘要： With the favorable microporous structure and excellent adsorption capacity, clay-hydrochar composites (CHCs) serve as promising materials to mitigate greenhouse gas emissions (GHG) from the paddy fields. Three clays were co-pyrolyzed with hydrochar derived from poplar sawdust to obtain CHCs, which were applied to the paddy fields to investigate the effects on methane (CH4) and nitrous oxide (N2O) emissions. Three CHCs were labeled as bentonite-hydrochar composite (BTHC), montmorillonite-hydrochar composite (MTHC), and kaolinitehydrochar composite (KTHC), respectively. The effects of these three CHCs on GHG emissions were determined by monitoring the dynamic CH4 and N2O emissions in the paddy soil column ecosystem during the rice-growing season. The results showed that compared with the control group, three CHCs significantly mitigated CH4 and N2O emissions by 21.4%-47.5% and 5.2%-36.8%, respectively. Furthermore, the fluorescent components result displayed CHCs increased humic-like content by 29.62%-59.72%. A structural equation model was used to assess the hypothesis mitigation mechanism, which exemplified that GHG emissions negatively correlated with pmoA and nosZ genes, possibly resulting in the CH4 and N2O mitigation. Among the three CHCs, the KTHC amendment mitigated the CH4 and N2O emissions by 47.5% and 36.8%, respectively, which was superior to BTHC and MTHC.
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