Dynamic responses of ammonia volatilization to different rates of fresh and field-aged biochar in a rice-wheat rotation system
文献类型： 外文期刊
作者： Dong, Yubing 1 ; Wu, Zhen 1 ; Zhang, Xi 1 ; Feng, Lian 1 ; 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, Jiangsu, Peoples R China
2.Jiangsu Acad Agr Sci, Huaiyin Inst Agr Sci Xuhuai Reg Jiangsu, Huaian 223001, Peoples R China
关键词： Biochar; Field aged biochar; Ammonia volatilization; Nitrogen use efficiency; Rice-wheat rotation
期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）
ISSN： 0378-4290
年卷期： 2019 年 241 卷
页码：
收录情况： SCI
摘要： Biochar, as a soil conditioner to increase soil carbon storage and improve soil quality, has been widely applied to farmland to mitigate climate change and enhance crop productivity. However, many studies have focused on the short-term effects of biochar amendment, while few studies have traced the long-term effects on ammonia (NH3) volatilization. A two-year field experiment was conducted to investigate the effect of different rates of field-aged biochar (applied 3 years before) and fresh biochar reapplication (fresh biochar applied to aged biochar) on NH3 volatilization, crop yield and nitrogen use efficiency (NUE) in a typical rice-wheat rotation system. The results showed that the NH3 loss rate of applied nitrogen fertilizer ranged from 5.9% to 13.2% in the wheat season and from 9.9% to 19.2% in the rice season. The fresh biochar reapplication increased NH3 volatilization losses. However, the low rate of aged biochar decreased NH3 volatilization, but the high rate of aged biochar still increased NH3 volatilization. The NH4+-N concentration and pH were determinant factors for NH3 volatilization. Both field-aged and fresh biochar reapplication improved rice and wheat NUE, although there was no significant increase in rice and wheat yields. Thus, biochar amendment at a low rate of 20 t ha(-1) beneficially mitigated NH3 volatilization and enhanced crop NUE in rice-wheat rotation systems during field aging.
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