微生物驱动的铁循环促进了几十年来生物炭修改土壤中的有机碳积累
Haohua He1, Jie Liu2, Zhipeng Shu1
1Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
Environmental science & technology
|July 5, 2024
概括
生物炭修正案通过增强微生物铁循环和矿物相互作用,增加了土壤有机碳 (SOC) 并减少了二氧化碳 (CO2) 排放. 这项研究揭示了长期用生物炭处理的土壤中复杂的机制.
科学领域:
- 土壤科学 土壤科学
- 环境科学 环境科学
- 微生物学 微生物学
- 生物地质化学生物地质化学
背景情况:
- 土壤有机碳 (SOC) 对农业和气候变化减缓至关重要.
- 生物炭是增加SOC和减少土壤二氧化碳排放的潜在工具.
- 在SOC动态中,生物炭与土壤微生物,铁矿物和新鲜有机物 (FOM) 的相互作用尚未完全理解,尤其是在长期应用后.
研究的目的:
- 研究生物炭在土壤有机碳 (SOC) 动态中的作用.
- 探索生物炭,土壤微生物,铁矿物质和新鲜有机物 (FOM) 之间的相互作用.
- 了解长期用生物炭修改的农业土壤中控制碳和铁动态的机制.
主要方法:
- 微宇宙化与土壤和没有十年长的生物炭修订历史.
- 引入新鲜有机物质 (FOM) 以评估其命运.
- 评估碳和铁的动态,微生物特性和基生成,使用对照的土壤泥实验.
主要成果:
- 生物炭修正案导致SOC在十年内增加了两倍.
- 在56天的潜伏期内,生物炭减弱了FOM诱导的二氧化碳排放量约11%.
- 生物炭促进了微生物驱动的铁减少和芬顿式反应,可能提高微生物细胞外电子转移和碳使用效率.
- 矿物保护和生物炭吸附/封闭有助于碳积累和FOM保存.
结论:
- 生物炭显著提高SOC积累,并减轻FOM的二氧化碳排放.
- 微生物铁循环和相关的芬顿式反应在生物炭修改土壤中发挥着关键作用.
- 矿物质和生物炭本身的物理保护是碳稳定和FOM保存的重要机制.
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