氧化排放是由环境条件驱动的,而不是在多年草场的应用方法
Sarah Brickman1,2,3, Heather Darby2,4, Lindsey Ruhl4
1Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, Vermont, USA.
Journal of environmental quality
|December 21, 2023
概括
肥料注入等农业实践可以增加温室气体排放. 在佛蒙特的禾场研究中,土壤水分,而不是施肥类型,是氧化 (N2O) 排放的主要驱动因素.
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:
- 农业最佳管理实践 (BMP) 可能会产生意想不到的气候影响.
- 肥料注入可以减少排放,但会增加氧化 (N2O) 排放.
- 尿酶抑制剂减少氨损失,但对N2O有混合作用.
研究的目的:
- 评估受精处理对多年草场N2O排放的影响.
- 确定农业系统中N2O流动的关键驱动因素.
主要方法:
- 在Alburgh,VT进行了为期2年的多年性禾场试验.
- 应用了四种受精治疗方法 (注射便,便广播,合成尿素,控制) 有或没有尿酶抑制剂.
- 测量了N2O,CO2,土壤矿物N,土壤水分,土壤温度和产量.
主要成果:
- 施肥类型显著影响了N2O流量,但解释了很小的变化 (R2 = 0.042).
- 酶抑制剂的应用对N2O排放没有显著影响.
- 土壤湿度是每日N2O流量的主要驱动因素 (39.7%的影响),其次是CO2流量,土壤无机N和温度.
结论:
- 土壤湿度和温度相互作用,最大限度地提高N2O排放.
- 将肥料注入时间调整为干燥或凉爽的时期,可以减轻气候影响.
- 需要进一步的研究来了解BMPs复杂的气候影响.
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