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Biochar stimulates NH4+ turnover while decreasing NO3- production and N2O emissions in soils under long-term vegetable cultivation

文献类型: 外文期刊

作者: Xie, Yu 1 ; Tan, Hao 1 ; Yang, Cheng 2 ; Ma, Erdeng 3 ; Zhu, Tongbin 4 ; Mueller, Christoph 5 , 6 ;

作者机构: 1.Hainan Acad Agr Sci, Inst Agr Environm & Soil, Haikou 571100, Hainan, Peoples R China

2.Geol Survey Jiangsu Prov, Nanjing 210018, Peoples R China

3.Yunnan Acad Tobacco Agr Sci, Kunming 650021, Yunnan, Peoples R China

4.Chinese Acad Geol Sci, Inst Karst Geol, Karst Dynam Lab, MLR & Guangxi, Guilin 541004, Peoples R China

5.Justus Liebig Univ Giessen, Inst Plant Ecol, Heinrich Buff Ring 26, D-35392 Giessen, Germany

6.Univ Coll Dublin, Sch Biol & Environm Sci & Earth Inst, Dublin 4, Ireland

关键词: Biochar; Vegetable soils; N-15 tracer; N transformation rate; N2O emission

期刊名称:SCIENCE OF THE TOTAL ENVIRONMENT ( 影响因子:6.551; 五年影响因子:6.419 )

ISSN: 0048-9697

年卷期: 2020 年 737 卷

页码:

收录情况: SCI

摘要: A N-15-tracer incubation experiment was conducted to investigate the short-term effects of biochar on gross N transformation rates and nitrous oxide (N2O) emissions in soils under 1-year and 10-year vegetable cultivations. Biochar was applied at three rates: 0 (control), 10, and 30 t ha(-1). Gross N transformation rates in the two vegetable soils varied in response to biochar application.Specifically, organic N oxidation into NO3- (O-Norg) was almost negligible in the biochar-amended soils, and biochar application at 10 t ha(-1) did not change either the rate of mineralization of organic N into NH4+ (M-Norg) nor the inorganic N supply capacity (INS, O-Norg + M-Norg) in both soils, when compared to the control. However, 30 t ha(-1) biochar decreased INS significantly, by inhibiting M-Norg, in the 1-year vegetable soil but increased INS, by stimulating M-Norg, in the 10-year vegetable soil. The rates of NH4+ oxidation into NO3- (O-NH4), NO3- immobilization into organic N, and dissimilatory NO3- reduction into NH4+ were not influenced significantly by biochar application in the 1-year vegetable soil, resulting in no significant differences in NO3- production potential. Conversely, biochar decreased NO3- production potential significantly in the 10-year vegetable soil, by inhibiting O-NH4 and increasing NH4+ immobilization into organic N (I-NH4), with more obvious effects under higher biochar application rates. Overall, the results demonstrate the capacity of biochar to stimulate NH4+ turnover and to decrease NO3- production potential in soil under long-term vegetable cultivation; however, the effect is limited under short-term vegetable cultivation. In addition, N2O emissions decreased significantly in biochar-amended vegetable soils. (C) 2020 Elsevier B.V. All rights reserved.

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