作 者： Ma T#, Wang YY#, Dai GH, Jia J, Liu ZG, Jia YF, Wang SM, Zhu ER, Zhang XY, Haghipour N, Wacker L, Jia BR, He JS, Zhang HL, Zhao MX, Eglinton TI, Feng XJ*
期刊名称： Geophysical Research Letters
影响因子： 4.6
出版年份： 2025
卷 期 号： 52( 1)
页 码： e2024GL112491
论文摘要：
Protection by metal (hydr) oxides is one of the key mechanisms for the long-term stabilization of soil organic carbon (SOC). However, the source and turnover of (metal-) bound organic carbon (OC) in soils are poorly constrained. Here we present the first large-scale study on the 13C and 14C characteristics of bound OC in 15 wetland and upland soil profiles. We find that bound OC has similar δ13C as SOC, suggesting no preference for plant- or microbe-derived carbon. However, bound OC Δ14C is more negative than SOC in wetland but not upland mineral soils, and decreases with increasing reactive minerals. Hence, in contrast to the conventional assumption, bound OC is better preserved relative to SOC in wetlands with high contents of reactive metals. Our finding highlights the dynamic exchange of bound OC with SOC in upland soils and calls for a better recognition of reactive metals in stabilizing OC in wetlands.
原文链接：https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GL112491