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Effects of warming and fertilization on paddy N2O emissions and ammonia volatilization

文献类型： 外文期刊

作者： Deng, Xuzhe 1 ; Xu, Tingting 1 ; Xue, Lixiang 1 ; Hou, Pengfu 1 ; Xue, Lihong 1 ; Yang, Linzhang 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Key Lab Agroenvironm Downstream Yangze Plain, Minist Agr & Rural Affairs China, Nanjing 210014, Peoples R China

2.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Peoples R China

3.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China

4.Jiangsu Acad Agr Sci, 50 Zhongling St, Nanjing 210014, Peoples R China

关键词： Simulated warming; Fertilization; N 2 O emission; NH 3 volatilization; Soil nitrogen transformation

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.6； 五年影响因子：6.7 ）

ISSN： 0167-8809

年卷期： 2023 年 347 卷

页码：

收录情况： SCI

摘要： Several studies have proved the influence of warming to N2O emissions and NH3 volatilization in paddies. However, it is not clear whether the performance is affected by fertilization. Here, we performed a field trial to evaluate the impacts of warming and fertilization on N2O emissions and NH3 volatilization from paddies. A free air temperature increase system was used for the experimental warming treatment (ET), while the control treatment used ambient temperature (AC). Both ET and AC treatments were combined with nitrogen (N) fertilizer (CF) or without fertilizer input (CK). The results showed insignificant interaction effects of warming and fertilization on seasonal cumulative N2O emissions and NH3 volatilization. Compared with AC, seasonal cumulative N2O emissions and ammonia volatilization in the ET treatment increased by 118.44% and 38.41%, respectively. Moreover, fertilization surprisingly stimulated seasonal cumulative N2O emissions and ammonia volatilization; values were 15.91 and 2.35 times higher than those in the CK treatment. These results imply that fertilization could intensify the increasing effect of warming on N2O emissions and ammonia volatilization. The variable importance for the projection (VIP) analysis revealed that soil N transformation (the rates of N mineralization, nitrification, and denitrification) was the key to affecting reactive N loss rather than soil fertility. Additionally, the ammonia volatilization rate increased with ambient temperature and NH4+-N solution concentration in the microsystem. Importantly, there was a "surge" inflection point of the ammonia volatilization rate under both high ambient temperature (30 degrees C) and NH4+-N concentration (15 mg/L) conditions. Our findings indicate that warming did promote N2O emissions and ammonia volatilization in paddies by accelerating soil N transformation, which might be aggravated by fertilization. Furthermore, the "surge" effect of high ambient temperature and NH4+-N concentration on ammonia volatilization deserves further attention.

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