泥炭池与当代的碳循环密切相关
Joshua F Dean1, Michael F Billett2, T Edward Turner3,4
1School of Geographical Sciences, University of Bristol, Bristol, UK.
Global change biology
|November 3, 2023
概括
泥炭池主要释放年轻碳,恢复工作有效地限制了旧碳出口. 甲泡是从这些重要生态系统中释放古老碳的潜在途径.
科学领域:
- 环境科学 环境科学
- 同位素地球化学 同位素地球化学
- 生态生态学 生态生态学
背景情况:
- 泥炭地是重要的全球碳汇,储存了数千年的碳.
- 泥炭池可以释放大量的碳,以溶解有机物,有机颗粒物,二氧化碳 (CO2) 和甲 (CH4) 的形式.
- 了解泥炭池释放的碳的年龄对于评估生态系统稳定性和气候反至关重要.
研究的目的:
- 通过放射性碳 (14C) 和稳定碳 (δ13C) 同位素,研究自然和恢复泥炭地池中的碳的年龄和来源.
- 为了比较天然泥炭地池和沟堵塞造成的恢复池之间的碳动员和温室气体排放.
- 评估泥炭地恢复在防止旧,深层碳排放方面的有效性.
主要方法:
- 从英国的六个泥炭地池区采集了97个水生样本.
- 使用14C和δ13C同位素技术分析溶解和颗粒有机碳,以及溶解的CO2.
- 区分来自初级生产的当代碳和来自深层泥炭层的古代碳.
主要成果:
- 泥炭池主要由当代碳 (年龄小于300年) 占据,约占所有碳形式的50%-75%.
- 自然和恢复池都积极转化和分解有机碳,排放二氧化碳,在自然池中观察到更高的大气混合.
- 在两种池类型的水生出口中发现的深层旧碳不稳定的证据很少,除了可能通过甲 (CH4) 沸.
结论:
- 通过堵塞沟创建的恢复池可以有效地防止从重新灌的泥炭地输出深厚的旧碳.
- 虽然大多数水生碳出口是当代的,但甲沸可能代表释放古代碳的途径.
- 泥炭地恢复策略,如沟封锁,似乎成功地保持了这些生态系统中储存的碳的完整性.
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