Storage, patterns and influencing factors for soil organic carbon in coastal wetlands of China,Global Change Biology

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Storage, patterns and influencing factors for soil organic carbon in coastal wetlands of China
Global Change Biology ( IF 11.6 ) Pub Date : 2022-06-30 , DOI: 10.1111/gcb.16325
Shaopan Xia _{1,

2} , Zhaoliang Song _{2,

3} , Lukas Van Zwieten ₄ , Laodong Guo ₅ , Changxun Yu ₆ , Weiqi Wang ₇ , Qiang Li ₂ , Iain P Hartley ₈ , Yuanhe Yang ₉ , Hongyan Liu ₁₀ , Yidong Wang ₁₁ , Xiangbin Ran ₁₂ , Cong-Qiang Liu _{2,

3} , Hailong Wang _{13,

14}

Affiliation

Institute of Resource, Ecosystem and Environment of Agriculture, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China.
School of Earth System Science, Institute of Surface-Earth System Science, Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin, China.
Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, China.
Wollongbar Primary Industries Institute, NSW Department of Primary Industries, Wollongbar, NSW, Australia.
School of Freshwater Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA.
Department of Biology and Environmental Science, Linnaeus University, Kalmar, Sweden.
Key Laboratory of Humid Subtropical Eco-Geographical Process, Ministry of Education, Fujian Normal University, Fuzhou, China.
Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK.
State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
College of Urban and Environmental Sciences, Peking University, Peking, China.
Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, China.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China.
School of Environment and Chemical Engineering, Foshan University, Foshan, Guangdong, China.
School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou, Zhejiang, China.

Soil organic carbon (SOC) in coastal wetlands, also known as “blue C,” is an essential component of the global C cycles. To gain a detailed insight into blue C storage and controlling factors, we studied 142 sites across ca. 5000 km of coastal wetlands, covering temperate, subtropical, and tropical climates in China. The wetlands represented six vegetation types (Phragmites australis, mixed of P. australis and Suaeda, single Suaeda, Spartina alterniflora, mangrove [Kandelia obovata and Avicennia marina], tidal flat) and three vegetation types invaded by S. alterniflora (P. australis, K. obovata, A. marina). Our results revealed large spatial heterogeneity in SOC density of the top 1-m ranging 40–200 Mg C ha⁻¹, with higher values in mid-latitude regions (25–30° N) compared with those in both low- (20°N) and high-latitude (38–40°N) regions. Vegetation type influenced SOC density, with P. australis and S. alterniflora having the largest SOC density, followed by mangrove, mixed P. australis and Suaeda, single Suaeda and tidal flat. SOC density increased by 6.25 Mg ha⁻¹ following S. alterniflora invasion into P. australis community but decreased by 28.56 and 8.17 Mg ha⁻¹ following invasion into K. obovata and A. marina communities. Based on field measurements and published literature, we calculated a total inventory of 57 × 10⁶ Mg C in the top 1-m soil across China's coastal wetlands. Edaphic variables controlled SOC content, with soil chemical properties explaining the largest variance in SOC content. Climate did not control SOC content but had a strong interactive effect with edaphic variables. Plant biomass and quality traits were a minor contributor in regulating SOC content, highlighting the importance of quantity and quality of OC inputs and the balance between production and degradation within the coastal wetlands. These findings provide new insights into blue C stabilization mechanisms and sequestration capacity in coastal wetlands.

更新日期：2022-06-30

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