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来自阿拉斯加低地北极泥炭地综合体的持续净二氧化碳和甲释放

Eugénie S Euskirchen^1,2, Colin W Edgar¹, Evan S Kane^3,4

¹Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska, USA.

Global change biology

|January 26, 2024

概括

阿拉斯加泥炭地上的永久土融化释放出大量的二氧化碳 (CO2) 和甲 (CH4). 丰富的,随着变暖变得越来越普遍,是最大的排放者,表明未来的碳排放将由这些生态系统驱动.

科学领域:

环境科学环境科学
气候科学气候科学
生态生态学生态生态学

背景情况:

泥炭地中的永久土退化改变了生态系统和碳储存.
永久土的解会影响植被,土壤特性和温室气体排放.
玻里亚泥炭地是全球碳循环的关键组成部分.

研究的目的:

调查不同永久土环境对阿拉斯加泥炭地二氧化碳 (CO2) 和甲 (CH4) 排放的影响.
量化不同生态系统类型 (永久结森林,崩的伤痕沼泽,丰富的) 的碳流.
确定碳排放的环境驱动因素,并预测未来的碳来源强度.

主要方法:

利用旋共变性来测量全年CO2和季节性CH4流量.
监控的环境变量包括降雨,降雪和活性层深度.
在四个相邻的地点进行碳排放的比较,这些地点具有不同的永久土条件.

主要成果:

所有研究的生态系统都是每年CO2和CH4的净来源.
净生态系统交换的年间变化很高 (±100 g C m−2 年−1).
没有永久土的丰富土是主要的二氧化碳和CH4排放者.

结论:

未来北极低地碳源强度可能取决于由于永久土融化而导致矿物质的扩张.
永久土融增加了水文连接,有利于的扩张.
长期测量对于了解气候变暖中的碳循环变化至关重要.

关键词:

内陆阿拉斯加内陆阿拉斯加北极低地生态系统碳循环循环的过程甲排放量甲排放量净生态系统交换交易所降水降水降水降水降水永久土的解.

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