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灌强度驱动土壤N2O滴灌棉田的排放减少
Honghong Ma1,2, Qi Wu3, Xianglin Wu1,2
1Institute of Agricultural Resources and Environment, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China.
Plants (Basel, Switzerland)
|April 12, 2025
概括
在新疆棉花田用塑料棉灌强度的增加显著增加了氧化 (N2O) 排放,尽管农作物产量下降. 这突显了干旱农业的用水和温室气体排放之间的关键权衡.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 用塑料土灌滴灌在新疆很常见,以提高水和肥料的效率.
- 过度灌以提高棉花产量可能会增加温室气体排放,但影响尚不清楚.
- 了解灌对氧化 (N2O) 的影响对于干旱地区的可持续农业至关重要.
研究的目的:
- 研究不同灌强度对滴灌棉花中氧化 (N2O) 排放的影响.
- 在不同的土壤水分水平下 (80%,90%,100%的田间容量) 量化N2O排放.
- 确定影响该农业系统N2O排放的因素.
主要方法:
- 在中国新疆进行的实地实验,使用滴灌棉花 (Gossypium hirsutum L.).
- 三种灌处理:保持土壤湿度在80% (Q80),90% (Q90) 和100% (Q100) 的田间容量.
- 在整个生长季节监测N2O排放,土壤特性,微生物群落和棉花产量.
主要成果:
- 棉花产量随着灌强度的增加而下降.
- 随着灌的增加,累积的N2O排放量显著增加:1.15 (Q80),1.48 (Q90) 和2.63公斤Nha-1 (Q100).
- 排放在灌后1-3天达到峰值,特别是在湿到干的过渡期间. 土壤真菌,菌,可用的,C:N比率和土壤温度影响的排放.
结论:
- 在干旱地区塑料灌下灌强度的增加增加了氧化 (N2O) 温室气体排放的风险.
- 优化灌对于平衡作物产量和减轻环境影响至关重要.
- 为了制定有效的缓解策略,需要对微生物动力学和土壤因素进行进一步的研究.
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