Increased Mineral-Associated Organic Carbon and Persistent Molecules in Allochthonous Blue Carbon Ecosystems

Coastal wetlands contain very large carbon (C) stocks—termed as blue C—and their management has emerged as a promising nature-based solution for climate adaptation and mitigation. The interactions among sources, pools, and molecular compositions of soil organic C (SOC) within blue C ecosystems (BCEs) remain elusive. Here, we explore these interactions along an 18,000 km long coastal line of salt marshes, mangroves, and seagrasses in China. We found that mineral-associated organic C (MAOC) is enriched in BCEs dominated by allochthonous inputs and abundant active minerals, leading to an increased proportion of persistent organic molecules. Specifically, soils with large allochthonous inputs (> 50%) are characterized by a substantial contribution of MAOC (> 70%) to total SOC with a notable preservation of lipids (36%) across salt marshes, mangroves, and seagrasses. The burial of allochthonous particles, derived from external sources such as rivers or tidal influxes, facilitates the formation of stable MAOC through binding to mineral surfaces or occlusion within microaggregates. The proportions of particulate organic C (POC) and MAOC are important predictors for molecular compositions of soil organic matter. Lipid proportions within molecular composition decrease as POC and autochthonous C proportions increase. These findings provide new insights into the coupled control over SOC sequestration in BCEs, emphasizing the role of allochthonous inputs, proportions of carbon pools, and persistent organic components. © 2025 John Wiley & Sons Ltd.

Авторы
Li Y. , Fu C. , Ye C. , Song Z. , Kuzyakov Y. , Vancov T. , Guo L. , Luo Z. , Van Zwieten L. , Wang Y. , Luo Y. , Wang W. , Zeng L. , Han G. , Wang H. , Luo Y.
Журнал
Издательство
Blackwell Publishing Ltd
Номер выпуска
1
Язык
Английский
Статус
Опубликовано
Номер
e70019
Том
31
Год
2025
Организации
  • 1 CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, China
  • 2 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
  • 3 Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
  • 4 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China
  • 5 Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, China
  • 6 Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, Göttingen, Germany
  • 7 Peoples Friendship University of Russia (RUDN University), Moscow, Russian Federation
  • 8 NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, NSW, Australia
  • 9 School of Freshwater Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI, United States
  • 10 College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China
  • 11 Wollongbar Primary Industries Institute, NSW Department of Primary Industries, Wollongbar, NSW, Australia
  • 12 Tianjin Key Laboratory of Water Resources and Environment, Faculty of Geography, Tianjin Normal University, Tianjin, China
  • 13 Key Laboratory of Humid Subtropical eco-Geographical Process, Ministry of Education, Fujian Normal University, Fuzhou, China
  • 14 School of Resources and Environmental Engineering, Ludong University, Yantai, China
  • 15 School of Environment and Chemical Engineering, Foshan University, Foshan, China
Ключевые слова
climate change; SOC sources; soil organic carbon; SOM composition; wetland ecosystems
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