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Negative pressure irrigation as a potential technique for increasing vegetable yields and decreasing nitrous oxide emissions

文献类型： 外文期刊

作者： Li, Shengping 1 ; Jiao, Ling 1 ; Wu, Xueping 1 ; Song, Xiaojun 1 ; Liu, Xiaotong 1 ; Gao, Huizhou 1 ; Han, Zixuan 1 ; Lu, Jinjing 4 ; Liang, Guopeng 5 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing, Peoples R China

3.Univ Liege, Terra Res Ctr, GxABT, 2 Passage Deportes, B-5030 Gembloux, Belgium

4.Shanxi Agr Univ, Inst Ecoenvironm & Ind Technol, Taiyuan 030031, Peoples R China

5.Univ Minnesota Twin Cities, Dept Forest Resources, St Paul, MN 55108 USA

关键词： Negative pressure irrigation; Greenhouse; Soil physicochemical properties; Vegetable yield; N2O emissions

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.3； 五年影响因子：4.5 ）

ISSN： 0304-4238

年卷期： 2023 年 318 卷

页码：

收录情况： SCI

摘要： Irrigation is a common practice used to promote vegetable yields through high agricultural inputs, which potentially increases nitrous oxide (N2O) emissions. However, it is still unclear how an effective irrigation strategy could increase yield by regulating soil water conditions, ultimately mitigating N2O emissions. In this study, negative pressure irrigation (NPI) and furrow irrigation (FI) were applied to control two different soil conditions (i.e., the stable soil water content and the dry-wet cycles) in a vegetable greenhouse growing amaranth (Amaranthus hybridus L.) and lettuce (Lactuca sativa L.). The key objective was to assess the effect of irrigation on vegetable yields and N2O emissions and further reveal their controlling factors. Compared to FI, NPI increased the seasonal stability of soil moisture, NH4+-N, and NO3-N by 11.4%, 26.4%, and 21.2%, respectively. NPI also increased vegetable yields by 16.6%20.3%, whereas the average area-scaled and yield-scaled N2O emissions under NPI were 15.1% and 29.2% lower than FI, respectively. Notably, the N2O emissions could be affected by soil moisture, temperature, NH4+-N, NO3-N, and soil microbial biomass carbon and nitrogen, but the relative importance of these factors was different under the two irrigation systems due to different soil water conditions. The random forest (RF) model showed that soil moisture was the most crucial factor driving N2O flux under FI, whereas soil NO3-N and NH4+-N were the key governing factors under NPI. Overall, this study highlights the importance of increasing seasonal soil water stability for improving the sustainability of irrigation and NPI was a promising irrigation strategy to promote vegetable yields while mitigating N2O emissions.

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