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Carbon sequestration and its controlling factors in the temperate wetland communities along the Bohai Sea, China
The carbon sequestration rate (CSR) in deltaic wetlands is associated with the nutrient balance, sediment (soil) accretion rate (SAR), and geological and climatic conditions. To explore these relationships, micronutrients; C, N, and P concentrations; and ages determined by using either paleosols or radiometric dating with 210Pb were analyzed from a total of 14 cores from the Yellow River Delta (YRD) and Liaohe Delta (LHD) wetlands collected in 2007 and 2012, respectively. With the exception of Ca, the concentrations of N, Corg, Cu, Zn, Fe, Mn, Mg, K, Al, and hydrogen ions (H+) were significantly higher in the wetland soils of the LHD, but the organic CSRs were virtually identical at the two sets of sites, about 140 g C m–2 y–1 at sites above mean sea level (MSL). SAR and organic CSR at LHD sites below MSL were about 2.8 times the corresponding rates at sites above MSL. SAR and total CSR were much higher in the YRD than the LHD because of the much greater accumulation rate of CaCO3 in the YRD. The organic CSRs were primary controlled by SAR in both detaic wetland systems. However, organic CSRs were much more sensitive to the changes of SARs in the LHD wetlands than in the YRD wetlands.
MF17120 Accepted 07 September 2017
© CSIRO 2017