在Fen-Bog比较中,从铁对土壤碳保存的控制转向酶主导的控制
Xinya Huang1,2, Xinwei Liu1,2, Jianliang Liu1,2
1Mountain Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610213, China.
Environmental science & technology
|November 29, 2025
概括
全球变暖对泥炭地土壤碳 (SOC) 的影响在和沼泽地不同. 在中,铁限制了碳的释放,而变暖增加了酶的活性,增加了二氧化碳的排放. 沼泽地碳释放主要是由酶活性驱动的.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 湿地中的土壤有机碳 (SOC) 循环由"酶锁"和"铁门"机制控制.
- 泥炭地SOC对地下水位下降和变暖的反应尚未完全理解.
研究的目的:
- 在模拟水表下降和变暖的条件下,研究铁和酶活性对土和沼泽土壤二氧化碳排放的贡献.
- 量化空气和变暖对SOC矿化的影响.
主要方法:
- 模拟氧气暴露和暖化在草地和沼泽土壤中.
- 量化二氧化碳排放量和测量铁结合有机碳 (OC) 和氧化酶活性.
主要成果:
- 在土中,铁 (II) 氧化抑制了氧化酶活性,减缓了碳矿化. 变暖增强了酶活性,增加了二氧化碳排放.
- 在沼泽土壤中,有氧条件和变暖增加了酶活性和所有层的二氧化碳排放.
- 铁结合的OC水平不受变暖的影响,但酶活性显著增加.
结论:
- 铁保护在没有变暖的情况下主导SOC矿化,而在变暖的情况下主导酶刺激.
- 酶活性是沼泽土壤中OC矿化的主要驱动因素.
- 在变暖的环境中",酶锁"机制可能会主导泥炭 SOC 的命运.
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