在小麦土壤N2O排放和回收下的C封存,高CO2度和高温之间的权衡
Jing Yang1, Guojun Liu2, Haiyan Tian2
1College of Agriculture, Shanxi Agricultural University, Taigu 030801, China; Maize Research Institute, Shanxi Agricultural University, Xinzhou 034000, China.
The Science of the total environment
|May 29, 2023
概括
在小麦系统中,回收增加了氧化 (N2O) 排放,但通过提高土壤碳和产量来减轻气候变化. 在气候效益方面,吸草的结合比堆肥更有效.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- 了解氧化 (N2O) 排放,管管理和气候变化之间的相互作用对小麦生态系统至关重要.
- 未来的气候场景,包括二氧化碳 (CO2) 和温度升高,显著影响农业温室气体动态.
研究的目的:
- 在未来的气候条件下,调查吸管回收 (纳入和堆积) 与去除对N2O排放,土壤特性和N循环基因的影响.
- 评估不同管管理实践的净全球变暖潜力 (NGWP) 和温室气体强度 (GHGI).
主要方法:
- 在环境和升高的二氧化碳和温度条件下对吸管回收 (纳入,覆盖) 和移除进行实验性操纵.
- 测量N2O排放,土壤物理化学性质,酶活动和参与循环的功能基因.
- 基于温室气体排放,作物产量和土壤有机碳 (C) 捕获的NGWP和GHGI的计算.
主要成果:
- 较高的二氧化碳和温度单独抑制了N2O排放的41-46%.
- 通过增强土壤的C和N基质和去化基因丰度,草回收显著增加了N2O排放 (31-109%),其影响比升高的CO2或温度更大.
- 草回报通过增加土壤有机C封存和谷物产量来降低NGWP和GHGI,并将其纳入土壤比堆肥更有效.
结论:
- 虽然草回收在未来的气候条件下刺激小麦系统中的N2O排放,但它更显著地提高了谷物产量和土壤有机C封存.
- 吸回收是农业气候变化缓解的一个有益的策略,特别是通过吸.
- 管理实践需要平衡N2O缓解与土壤碳增强和产量增加的好处.
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