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模拟未来气候对N2O排放和土壤碳储存的影响在控制释放尿素和草的合并下在玉米田中

Jingrong Song¹, Shushang Bao¹, Ju Bai²

¹College of Natural Resource and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 12100, China.

Journal of environmental management

|December 21, 2023

概括

在干地玉米种植中,将控制释放尿素与草的结合相结合,为增加产量,改善土壤有机碳,并在未来气候变化情景下减少温室气体排放提供了最佳策略.

科学领域:

农业科学农业科学
环境科学环境科学
适应气候变化适应气候变化

背景情况:

可持续的农业实践,如控制释放尿素和草的结合正在获得引力.
这些做法对干旱地区玉米产量,土壤健康和未来气候下的环境的长期影响尚未完全理解.

研究的目的:

评估控制释放尿素和草的长期影响,对干旱地区的玉米生产.
根据未来的气候变化情景 (SSP245和SSP585) 评估这些影响.

主要方法:

进行了一项为期六年的实地实验,以校准和验证脱-分解 (DNDC) 模型.
测试了四种治疗方法:非 (CK),常规尿素 (UR),控制释放尿素 (CU) 和控制释放尿素与草 (CUS).
经过验证的DNDC模型与未来的气候数据相结合,以模拟农业实践.

主要成果:

模型验证显示,与温室气体排放,土壤有机碳 (SOC) 和玉米产量的观测数据有很好的一致性.
未来的气候情景预测,UR,CU和CUS处理的玉米产量增加,尽管在SSP585.5下,CU产量利益可能在2050年后下降.
CUS处理显著降低了N2O排放,并逐渐增加了SOC储存,抵消了CO2相当的排放.

结论:

与常规尿素相比,控制释放尿素的应用有效降低了N2O排放.
结合控制释放尿素与草合并 (CUS),为干旱地区的玉米提供了最全面的益处.
在预测的未来气候条件下,CUS战略提高了玉米产量,改善了SOC储存,并减轻了温室气体排放.

关键词:

控制释放尿素的应用在 DNDC 模型中,温室气体排放的温室气体排放量长期变化长期变化有机碳的储存有机碳的储存.吸草的结合吸草的结合

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