Biowaste to treasure: Application of microbial-aged hydrochar in rice paddy could improve nitrogen use efficiency and rice grain free amino acids
文献类型： 外文期刊
作者： Yu, Shan 1 ; Feng, Yanfang 2 ; Xue, Lihong 2 ; Sun, Haijun 3 ; Han, Lanfang 4 ; Yang, Linzhang 2 ; Sun, Qingye 1 ; Chu, Q 1 ;
作者机构： 1.Anhui Univ, Sch Resources & Environm Engn, Hefei 230601, Anhui, Peoples R China
2.Jiangsu Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Agroenvironm Downstream Yangtze Plain, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China
3.Nanjing Forestry Univ, Coll Forestry, Nanjing 210037, Jiangsu, Peoples R China
4.Guangdong Univ Technol, Inst Environm & Ecol Engn, Guangzhou 510006, Guangdong, Peoples R China
5.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA
6.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Jiangsu, Peoples R China
关键词： Biowaste; Agro-environment; Biochar-derived dissolved organic matters; Crop yield; Hydrothermal carbonization; Modification of hydrochar
期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.297； 五年影响因子：9.444 ）
ISSN： 0959-6526
年卷期： 2019 年 240 卷
页码：
收录情况： SCI
摘要： Hydrochar is produced under hydrothermal carbonization, which can be considered as a cleaner process for black carbon production. Hydrochar shows good prospects in agro-environmental applications, but it is recommended to be ameliorated before application to improve its surface characteristics and reduce potential side-effects. This study, for the first time, proposed ameliorating poplar sawdust hydrochar via a microbial-aging process and applying it to rice paddy soil. In a soil-column experiment, sawdust hydrochar (SHC), microbial-aged SHC (M-SHC), and water-washed SHC (W-SHC) were added at different rates to examine their effects on rice growth and nitrogen usage efficiency (NUE). Additionally, the effects of hydrochar application on rice grain free amino acids (FAAs) were investigated. The study revealed that M-SHC had a positive effect on rice growth and increased the grain yield by 17.13%-22.99% compared with control. The NUE was also improved by M-SHC treatment. The positive effect of M-SHC on rice yield might be attributed to the reduced toxic biochar-derived dissolved organic matters, increased specific surface area, elevated hydrochar pH, and more nutrients released due to the microbial-aging process. Moreover, under M-SHC treatment, all 17 FAAs of grain were significantly higher than the control, by 46.26%. Both microbial-aging and water-washing amelioration of hydrochar had a positive effect on rice yield and FAAs, with the former exhibiting better prospects for application. This study will provide a new direction for cleaner recycling and utilization of biowaste. (C) 2019 Published by Elsevier Ltd.
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