期刊
ACS EARTH AND SPACE CHEMISTRY
卷 5, 期 5, 页码 1094-1101出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsearthspacechem.1c00019
关键词
DOM; biodegradation; molecular fractionation; selective adsorption; mineral
资金
- National Natural Science Foundation of China [21537005, 41773119]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2020044]
Minerals play a protective role in preserving organic carbon in soils by preventing biodegradation of dissolved organic matter, but not all components are equally protected due to selective adsorption. Molecular fractionation at the ferrihydrite-water interface affects the biodegradation of plant-derived DOM. Compounds with lower affinities to ferrihydrite are more easily degraded, while those with higher affinities are more stable.
Minerals are known to protect dissolved organic matter (DOM) against biodegradation and thus play an important role in the long-term persistence of organic carbon (OC) in soils. However, as a super-mixture of organic compounds, it is expected that not all components in DOM can be protected by minerals due to selective adsorption. The present study examined how molecular fractionation of plant-derived DOM at ferrihydrite-water interface Leach e affects their biodegradation. The results of Fourier transform ion cyclotron resonance mass spectrometry analysis showed that highly unsaturated and oxygenated moieties in DOM displayed high affinities, while highly saturated compounds rich in aliphatic groups exhibited low affinities to ferrihydrite, resulting in the molecular fractionation of DOM at the water-mineral interface. Comparison of the biodegradation of DOM extracted from different phases after adsorption on ferrihydrite indicated that compounds with lower affinities to ferrihydrite had higher degradation MAOM degrees, while compounds with higher affinities to ferrihydrite had lower degradation degrees. Considering the protective role of minerals on adsorbed OC, molecular fractionation at the ferrihydrite-water interface leads to inherently refractory OC being more stable, while labile OC is more easily degraded in soils.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据