无生物的细胞外催化在地球生态系统的土壤碳分解中扮演着被低估的角色
Yunpeng Zhao1,2, Chengzhu Liu1,2, Wenhui Zhang1,2,3
1State Key Laboratory of Forage Breeding-by-Design and Utilization, and Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
Environmental science & technology
|January 17, 2026
概括
由土壤矿物质驱动的非生物催化,对土壤有机物分解有显著的贡献. 这个以前被低估的过程对于理解土壤碳循环和气候反至关重要.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 细胞外催化对于土壤有机物分解和碳气候反至关重要.
- 目前的理解主要将这种催化归因于生物酶,忽视了非生物的贡献.
- 这种监督导致土壤碳降解潜力和全球变化应对评估的不准确性.
研究的目的:
- 量化非生物过程对陆地生态系统中细胞外催化作用的贡献.
- 研究土壤矿物质,特别是含铁和矿物质在非生物催化中的作用.
- 为了比较非生物与生物催化剂的稳定性和环境反应.
主要方法:
- 跨越多样化的生态系统进行大规模现场调查.
- 使用普通土壤矿物质进行验证实验和实验室模拟.
- 对土壤有机物分解和细胞外催化活动的分析.
主要成果:
- 生物催化剂对土壤的氧化 (平均为43%) 和水解 (平均为54%) 活动有显著的贡献.
- 含铁和的矿物质是无生物催化的主要驱动因素.
- 与酶驱动的过程不同的是,非生物催化在不同的温度,pH值,微生物活动和水分水平上保持稳定.
- 生物催化在深层土壤和湿地中尤为重要.
结论:
- 由土壤矿物质驱动的非生物催化作用在土壤碳分解中起着重要的,以前被低估的作用.
- 这些发现挑战了以酶为中心的范式,强调了矿物驱动反应的重要性.
- 准确评估土壤碳循环和气候反需要整合非生物催化剂.
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