Distribution, source and degradation characteristics of surface soil organic carbon in typical habitats of the Yellow River Estuary wetland
Received date: 2025-07-15
Revised date: 2025-11-21
Online published: 2026-02-09
Coastal wetlands have a strong capacity for carbon capture and storage, playing a significant role in mitigating climate warming. Vegetation type is an important factor influencing the carbon storage. In this study, we measured the soil organic carbon (SOC), lignin, stable carbon isotope (δ13C), grain size, and iron content in the surface soil of three typical vegetation habitats (Phragmites australis, Phragmites australis-Tamarix chinensis, and Suaeda salsa) in the Yellow River Estuary wetland, and analyzed the content, source, and degradation characteristics of organic carbon. The results showed that the SOC content in the three vegetation habitats of the Yellow River estuary wetland ranged from 0.34% to 1.85%, with the highest in P. australis, which had an average value of 0.94%. The SOC content was jointly affected by vegetation type and clay content. The three-end-member Monte Carlo model calculation found that the soil organic carbon in the three vegetation habitats was mainly from terrestrial (47.7%±13.2%) and plant sources (36.3%±15.0%), with a relatively low marine source (16.0%±14.2%) (S. salsa>P. australis-T. chinensis>P. australis). The soil lignin in the three vegetation habitats all showed a mixture or single source of woody and herbaceous tissues, indicating that part of the soil organic carbon in the P. australis and S. salsa habitats originated from the upstream Loess Plateau. Iron oxides and water in the soil might reduce the degradation of lignin due to their protective effect on organic carbon and their inhibitory effect on aerobic respiration of microorganisms. This study showed that there were significant differences in the distribution, source, and degradation characteristics of soil organic carbon among different vegetation habitats.
NI Xin , ZHAO Guangming , ZHANG Yao , WANG Weihua , SU Dapeng , LU Feng , KANG Zhiqiang , KANG Fei . Distribution, source and degradation characteristics of surface soil organic carbon in typical habitats of the Yellow River Estuary wetland[J]. Journal of Marine Sciences, 2025 , 43(4) : 71 -78 . DOI: 10.3969/j.issn.1001-909X.2025.04.005
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