对于叶多玛塔利克斯地区温室气体生产的氧化控制
Oded Bergman1,2, Katey Walter Anthony2, E Eliani-Russak1
1Department of Earth and Environmental Sciences, Ben Gurion University of the Negev, Beersheva, Israel.
Global change biology
|July 21, 2025
概括
北极永久土的融化会释放温室气体. 耶多马永久土中的微生物活动显示,全年都会产生甲,冬季甲消耗减少,导致大气排放增加.
科学领域:
- 环境微生物学 环境微生物学
- 地质化学 地质化学
- 永久土科学 永久土科学
背景情况:
- 北极耶多马永久土储存了大量的碳和池,易受融化影响.
- 永久土融化的微生物矿化会释放二氧化碳 (CO2),甲 (CH4) 和氧化 (N2O) 等温室气体.
研究的目的:
- 在现场调查季节性微生物功能,社区动态和阿拉斯加耶多马永久土中的温室气体生产.
- 量化甲 (CH4) 和氧化 (N2O) 在不同温度和的可用性下循环.
主要方法:
- 来自深 (7米) 塔利克土壤钻井的地化学数据的分析.
- 评估微生物群落的组成,多样性和功能.
- 测量微生物活动和基因表达的局部季节性变化.
主要成果:
- 在深深的塔利克中,全年发生甲生成;冬季甲变质是可以忽略不计的,增加了CH4排放.
- 接近地表的夏季有氧甲缩减了CH4排放,同时发生了古生物和细菌对甲的无氧氧化 (AOM).
- 夏季观察到更高的N2O生产潜力,与脱和介导的AOM有关,峰值度在10厘米和105厘米深处.
结论:
- 微生物过程的季节性变化显著控制了来自耶多马永久土的温室气体流.
- 降低冬季甲氧化增加了净CH4释放,而夏季脱和AOM有助于N2O生产.
- 未来的气候变暖可能会增加耶多马高原的温室气体净排放量,因为夏季更长,更温暖.
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