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Biochar and hydrochar application influence soil ammonia volatilization and the dissolved organic matter in salt-affected soils

文献类型： 外文期刊

作者： Ma, Yaxin 2 ; Xie, Wenping 1 ; Yao, Rongjiang 1 ; Feng, Yanfang 1 ; Wang, Xiangping 1 ; Xie, Huifang 2 ; Feng, Yuanyuan 4 ; Yang, Jingsong 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

2.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources Re, Nanjing 210094, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Nanjing 210014, Peoples R China

4.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China

关键词： Saline soils; Biochar; Hydrochar; Ammonia volatilization; Dissolved organic matter (DOM)

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 926 卷

页码：

收录情况： SCI

摘要： Biochar, which including pyrochar (PBC) and hydrochar (HBC), has been tested as a soil enhancer to improve saline soils. However, the effects of PBC and HBC application on ammonia (NH 3 ) volatilization and dissolved organic matter (DOM) in saline paddy soils are poorly understood. In this research, marsh moss -derived PBC and HBC biochar types were applied to paddy saline soils at 0.5 % ( w/w ) and 1.5 % ( w/w ) rates to assess their impact on soil NH 3 volatilization and DOM using a soil column experiment. The results revealed that soil NH 3 volatilization significantly increased by 56.1 % in the treatment with 1.5 % ( w/w ) HBC compared to the control without PBC or HBC. Conversely, PBC and the lower application rate of HBC led to decrease in NH 3 volatilization ranging from 2.4 % to 12.1 %. Floodwater EC is a dominant factor in NH 3 emission. Furthermore, the fluorescence intensities of the four fractions (all humic substances) were found to be significantly higher in the 1.5 % ( w/w ) HBC treatment applied compared to the other treatments, as indicated by parallel factor analysis modeling. This study highlights the potential for soil NH 3 losses and DOM leaching in saline paddy soils due to the high application rate of HBC. These findings offer valuable insights into the effects of PBC and HBC on rice paddy saline soil ecosystems.

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