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Enhanced Lateral Exchange of Carbon and Nitrogen in a Coastal Wetland With Invasive Spartina alterniflora

文献类型： 外文期刊

作者： Gao, Yu 1 ; Peng, Rong-Hao 3 ; Ouyang, Zu-Tao 7 ; Shao, Chang-Liang 9 ; Chen, Ji-Quan 8 ; Zhang, Ting-Ting 1 ; Guo, Ha 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Key Lab East China Sea & Ocean Fishery Resources, East China Sea Fisheries Res Inst, Minist Agr & Rural Affairs, Shanghai, Peoples R China

2.Chinese Acad Fishery Sci, Sci Observing & Expt Stn Fisheries Resources & En, East China Sea Fisheries Res Inst, Minist Agr & Rural Affairs, Shanghai, Peoples R China

3.Fudan Univ, Minist Educ, Key Lab Biodivers Sci & Ecol Engn, Coastal Ecosyst Res Stn Yangtze River Estuary, Shanghai, Peoples R China

4.Fudan Univ, Minist Educ, Inst EcoChongming IEC, Shanghai, Peoples R China

5.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China

6.East China Normal Univ, Inst EcoChongming IEC, Shanghai, Peoples R China

7.Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA

8.Michigan State Univ, Dept Geog Environm & Spatial Sci, E Lansing, MI 48824 USA

9.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing, Peoples R China

关键词： lateral exchange; sediment accretion; coastal wetlands; invasion; Spartina alterniflora; Phragmites australis

期刊名称：JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES （ 影响因子：3.822； 五年影响因子：4.566 ）

ISSN： 2169-8953

年卷期： 2020 年 125 卷 5 期

页码：

收录情况： SCI

摘要： Lateral movements of materials and energy in coastal wetlands, due mainly to tidal activities, have been recognized as key processes in understanding the biogeochemical cycles of ecosystems. However, our understanding of the roles of lateral movement in shaping ecosystem functions remains limited. Here we quantified the effects of lateral sediment transport on total carbon (C, inorganic + organic) and nitrogen (N) pools in plants and soils in two dominant wetland types: invasive Spartina alterniflora (Spartina) marshes and native Phragmites australis (Phragmites) marshes in coastal Shanghai of the Yangtze Estuary. We found that the accreted sediments across the water-marsh gradients caused by lateral movement resulted in contrasting C and N contents between the two communities. The sediment load and C and N pools in the plants and soils of the Spartina marshes were significantly higher than those in the adjacent Phragmites marshes. The shifts in species composition and community structure not only altered the C and N balance but also enhanced the ecosystem net primary productivity. Our findings highlight the importance of lateral transport in altering ecosystem structure after Spartina invasion. The ecosystem C and N pools were significantly higher in the invaded ecosystems than in the native community. Our study also reveals that the plant density and structures can alter tidal hydrodynamics and the lateral transportations of sediments, which in turn influence ecosystem C and N cycle. The C accumulation processes of the native and invaded marshes were further complicated by the contrasting productivities of the ecosystems.

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