微生物的耐药性和对干旱的适应性,以及重新湿的土壤调节了不同肥料的N2O排放
Xiaoya Xu1, Yaowei Liu2, Caixian Tang3
1Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China; College of Geography and Environment, Shandong Normal University, Jinan 250014, China.
干旱和重新湿事件显著改变土壤的氧化 (N2O) 排放. 微生物的耐药性和弹性,特别是氨氧化细菌和特定的无化细菌,对于在不断变化的气候条件下理解和减轻这些N2O排放至关重要.
科学领域:
- 土壤科学 土壤科学
- 环境微生物学环境微生物学
- 气候变化研究研究 气候变化研究
背景情况:
- 预计气候变化将增加干旱和重新湿事件,影响土壤循环和氧化 (N2O) 排放.
- 在不同的土壤湿度条件下,驱动这些N2O排放变化的微生物机制尚不清楚.
研究的目的:
- 调查土壤湿度状况 (湿,干旱,重新湿) 和化抑制剂 (DCD) 对N2O排放的影响.
- 为了检查N2O产生和N2O减少微生物群落在不同水分制度下对尿素和堆肥猪应用的作用.
主要方法:
- 进行了化研究,使用酸性土壤进行了三次水分处理:100%的WHC (湿),40%的WHC (干旱) 和从40%到100%的WHC (重新湿) 的过渡.
- 尿素和堆肥猪被应用,有或没有DCD,以评估对土壤微生物群落和N2O排放的影响.
主要成果:
- 在干旱期间,N2O排放量减少,在重新湿时显著增加.
- 微生物耐药性 (氨氧化细菌,nosZII) 和弹性 (氨氧化细菌,nirS型脱剂,nosZI) 在调节N2O排放中起到了至关重要的作用.
- 在N2O排放和 nosZII在湿时,和 nosZI在重新湿后之间发现了负相关性.
结论:
- 土壤微生物的抗性和弹性是影响N2O排放在波动的湿度条件下的关键因素.
- 了解这些微生物动态对于在气候变化中制定有效的减轻N2O排放战略至关重要.
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