Concurrent Response of Greenhouse Soil NO<sub>3</sub><sup>−</sup> Concentration and N<sub>2</sub>O Emissions to Nitrogen and Irrigation Management in China: A Meta-Analysis

oleh: Guiliang Wang, Haojie Xu, Kaiyuan Huang, Jinchuang Wang, Haitao Zhao, Xiaoqing Qian, Juanjuan Wang

Format: Article
Diterbitkan: MDPI AG 2024-06-01

Deskripsi

The soil NO<sub>3</sub><sup>−</sup> concentration and N<sub>2</sub>O emissions plays a crucial role in mitigating greenhouse gas emissions and minimizing greenhouse soil degradation concurrently. However, it is essential to understand the extent to which management practices and environmental factors influence the reduction in NO<sub>3</sub><sup>−</sup> concentration and N<sub>2</sub>O emissions in greenhouse soils. Here, we conducted a meta-analysis, compiling a database of NO<sub>3</sub><sup>−</sup> concentration and N<sub>2</sub>O emissions in response to either nitrogen or irrigation management in greenhouse vegetable-based systems in China. In summary, controlling the amount of total nitrogen application and irrigation water within specific ranges can effectively reduce both the greenhouse NO<sub>3</sub><sup>−</sup> concentration and N<sub>2</sub>O emissions. Compared to chemical nitrogen management, the application of slow-release fertilizer could concurrently reduce the soil NO<sub>3</sub><sup>−</sup> concentration and N<sub>2</sub>O emissions by 0.20 and 0.36 times, respectively. Positive relationships were observed between soil NO<sub>3</sub><sup>−</sup> concentration and N<sub>2</sub>O emissions under conditions of higher soil organic carbon (OC), total nitrogen (TN), alkali-hydrolyzed nitrogen (AN), and pH, as well as a lower soil temperature (ST) and bulk weight (BW). Under conditions with a higher OC and pH, an appropriate nitrogen application rate is more effective in reducing N<sub>2</sub>O emissions. While increasing irrigation can reduce soil NO<sub>3</sub><sup>−</sup> concentrations, it also raises the risk of significant NO<sub>3</sub><sup>−</sup> leaching. Overall, nitrogen and irrigation management should be tailored to local soil physicochemical properties to concurrently regulate soil NO<sub>3</sub><sup>−</sup> concentrations and N<sub>2</sub>O emissions in greenhouse environments.