Title：
The impact of sea embankment reclamation on soil organic carbonand nitrogen pools in invasive Spartina alterniflora and native Suaedasalsa salt marshes in eastern China
Authors：
Corresponding
Author：
Wen Yang, Ning Li, Xin Leng*, Yajun Qiao, Xiaoli Cheng*, Shuqing An
Pubyear：
2016
Title of
Journal：
Ecological Engineering
Paper
Code：
Volume：
97
Number：
Page：
582–592
Others：
Classification：
Source：
Abstract：
tThe construction of sea embankments is an increasingly common approach for controlling the spread ofthe exotic C4perennial grass Spartina alterniflora Loisel. in coastal wetlands of eastern China. However,the impact of sea embankment reclamation on the soil organic carbon (C) and nitrogen (N) dynamicsin salt marshes is not fully understood. In this study, we examined the stocks of the total, labile andrecalcitrant organic C and N, the recalcitrant indices of C and N, and the concentrations of water-solubleorganic carbon (WSOC), microbial biomass carbon (MBC) and cumulative CO2-C mineralization (MINC) insea embankment-reclaimed S. alterniflora and Suaeda salsa (Linn.) Pall. salt marshes through comparisonswith adjacent unreclaimed S. alterniflora and S. salsa salt marshes in a coastal wetland of eastern China.Sea embankment reclamation significantly decreased plant biomass by 55.34%, soil salinity by 81.71%,soil moisture by 43.16%, soil total organic C by 50.60% and total organic N by 49.99%, and also loweredlabile and recalcitrant organic C and N, WSOC, MBC and MINC in the invasive S. alterniflora salt marsh.However, sea embankment reclamation did not significantly affect the stocks of the soil organic totalC and N, recalcitrant organic C and N, and soil organic C dynamics in the native S. salsa salt marsh,possibly because the total quantity of S. salsa materials entering the soil, soil salinity, moisture and bulkdensity were not affected by sea embankment reclamation. Our results suggest that the impact of seaembankment reclamation on soil organic C and N pools is much more profound in S. alterniflora saltmarsh than in S. salsa salt marsh. Sea embankment reclamation could greatly weaken the C and N sinksof S. alterniflora salt marsh and potentially affect C and N sinks in the coastal wetlands of eastern China.
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