Hydrochar reduced NH3 volatilization from rice paddy soil: Microbial-aging rather than water-washing is recommended before application

JOURNAL OF CLEANER PRODUCTION

卷:268

Article

Yu, Shan^1,2  Xue, Lihong^1,6  Feng, Yanfang^1,5,6  Liu, Yang³  Song, Zhizhong⁴  Mandal, Sanchita^7,8  Yang, Linzhang¹  Sun, Qingye²  Xing, Baoshan⁵ 

[1] Jiangsu Acad Agr Sci, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

[2] Anhui Univ, Sch Resources & Environm Engn, Hefei 230601, Peoples R China

[3] Jiangsu Acad Agr Sci, Inst Agr Informat, Nanjing 210014, Peoples R China

[4] Ludong Univ, Coll Agr, Yantai 264025, 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

[7] Univ South Australia, Future Ind Inst, Mawson Lakes, SA 5095, Australia

[8] Univ Sheffield, Dept Anim & Plant Sci, Western Bank, Sheffield S10 2TN, S Yorkshire, England

关键词: Hydrochar;    Rice paddy soil;    NH3 volatilization;    Aging process;    Soil amoA genes;    Soil urease activity;   

DOI  :  10.1016/j.jclepro.2020.122233

来源: Elsevier

【 摘 要 】

Soil amendments (e.g., hydrochar) have recently gained increasing research interest because of their potential application in agricultural soils to reduce nutrient loss to the environment. In order to improve the surface properties of hydrochar, we herein used the microbial-aging approach to produce microbially-aged hydrochar (M-SHC), which was applied in rice paddy soil columns to investigate nitrogen transformation processes and gaseous nitrogen losses by NH3 volatilization. The aim of this research was mainly to explore and understand the mechanisms by which sawdust hydrochar (SHC), MSHC, and water-washed hydrochar (W-SHC) influence NH3 volatilization in rice paddy fields. Compared with the control, M-SHC treatment considerably reduced both cumulative NH3 and yield-scale NH3 volatilization by 11.52% and 24.40% (p<0.05), respectively. This reduction could be attributed to a decrease in NH4+-N concentrations and an alteration of floodwater pH, following the application of MSHC. The results showed that changes in floodwater pH could considerably affect the NH3 volatilization rate. When floodwater was slightly alkaline (pH > 7.25), even a minor alteration of pH following the application of hydrochar could increase NH3 volatilization rapidly. The application of hydrochar substantially inhibited the soil urease activity and increased the soil amoA gene abundance, which, in turn, decreased the floodwater NH4+-N concentrations. These results offer strong theoretical support for the application of hydrochar in agricultural systems to decrease NH3 volatilization in rice paddy fields. (c) 2020 Elsevier Ltd. All rights reserved.

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