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Biochar and organic substitution improved net ecosystem economic benefit in intensive vegetable production

文献类型： 外文期刊

作者： Bi, Ruiyu 1 ; Zhang, Qianqian 1 ; Zhan, Liping 1 ; Xu, Xintong 1 ; Zhang, Xi 1 ; Dong, Yubing 1 ; Yan, Xiaoyuan 4 ; Xiong, Zhengqin 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Jiangsu Key Lab Low Carbon Agr & GHGs Mitigat, Nanjing 210095, Peoples R China

2.Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China

3.Jiangsu Acad Agr Sci, Huaiyin Inst Agr Sci, Huaian 223001, Peoples R China

4.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

关键词： Biochar amendment; Organic substitution; Crop production; Reactive nitrogen; Nitrogen footprint; Net ecosystem economic benefit

期刊名称：BIOCHAR （ 影响因子：11.452； 五年影响因子：11.452 ）

ISSN： 2524-7972

年卷期： 2022 年 4 卷 1 期

页码：

收录情况： SCI

摘要： Biochar amendment and substituting chemical fertilizers with organic manure (organic substitution) have been widely reported to increase crop production and decrease reactive nitrogen (Nr) loss including nitrous oxide (N2O), nitric oxide (NO), and ammonia (NH3) emissions, and N runoff and leaching. However, few comprehensive evaluations have been performed on the environmental and economic aspects of biochar amendment or organic substitution. Here, we studied the comprehensive effects of biochar amendment, organic substitution, and biochar amendment combined with organic substitution on crop production, Nr loss, and net ecosystem economic benefit (NEEB) in intensive vegetable production by integrating life-cycle assessment for Nr footprints, empirical models for NH3 volatilization and N runoff and leaching derived from peer-reviewed publications and validated by the current measurements and direct field measurement for N2O and NO emissions during 5 consecutive years of vegetable crop rotations. Five fertilization treatments were applied (SN: synthetic fertilizer application; SNB: SN plus 20 t ha(-1) biochar amendment; SNM: substituting 50% of chemical N fertilizer with organic manure; SNMB: SNM plus 20 t ha(-1) biochar amendment; and CK: no fertilizer or biochar addition). Compared with the SN, the SNB increased vegetable yield (28.4%, p < 0.05; interannually varying from - 10 to 74.9%) and nitrogen use efficiency (29.2%, interannually varying from - 39.7 to 150.4%), and decreased field Nr loss (45.4%, p < 0.01; interannually varying from - 40.3 to 78.4%), and thus improved NEEB by 7.1%; meanwhile, the SNM increased vegetable yield (11.6%, interannually varying from - 5.4 to 27.1%) and nitrogen use efficiency (45.7%, p < 0.05; interannually varying from 2.3 to 154%), reduced field Nr loss (34.9%, p < 0.01; interannually varying from 8.4-39.0%), and thus improved NEEB by 17.8% (p < 0.05) compared to the SN, being 56.0 x 10(3) Chinese Yuan (CNY) ha(-1) crop(-1). Due to the high foreground Nr loss during organic manure production and high input costs of biochar production, the SNMB decreased the NEEB by 8.0% as compared to the SN. Moreover, the SNB and SNM improved vegetable qualities by increasing protein, soluble sugar, and vitamin C contents while decreasing nitrate content (p < 0.05). Therefore, single application of biochar amendment or organic substitution would achieve better NEEB and product quality in vegetable production.

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