title: [Profile nutrient distribution and sedimentary characteristics in typical marshes of Sanjiang Plain].
abstract: Profile distribution characteristics of organic carbon (C), total nitrogen (N), total phosphorus (P) and total sulfur (S) were studied in two typical marshes including Carex lasiocarpa marsh and Phragmites australis marsh in the Sanjiang Plain. Sedimentary characteristics of typical mashes were analyzed. The results showed that vertically these soil chemical elements also varied, showing obvious stratification and enrichment. In a soil profile, soil organic C under both vegetation communities gradually decreased; soil total N first increased and then decreased under both; total P under Carex lasiocarpa first decreased and then increased, whereas it decreased with the increasing depth under Carex lasiocarpa; total S was reduced with increasing depth under both marshes. Total N, total P and total S were all strongly correlated with soil organic C (P < 0.01); soil organic C was strongly correlated with bulk density (P < 0.01). Our study also illustrated that the vegetation types had different influences for organic C, total N, total P and total S of the marsh profiles. Environmental 137Cs and 210Pb dating techniques were applied to determine recent sedimentation rates, and the constant rate of supply (CRS) was applied to deduce the age of sediment core, and the results showed that the mean sedimentation rate was 0.33 cm x a(-1), and the sedimentation fluxes ranged 0.03-0.48 g x (cm2 x a)(-1) [Mean = 0.29 g x (cm2 x a) -1].
authors.forename: Rui-Li
authors.initials: RL
authors.lastname: Li
authors.forename: Min-Wei
authors.initials: MW
authors.lastname: Chai
authors.forename: Guo-Yu
authors.initials: GY
authors.lastname: Qiu
authors.forename: Fu-Chen
authors.initials: FC
authors.lastname: Shi
authors.forename: Kaichiro
authors.initials: K
authors.lastname: Sasa
mesh_terms: D031255:Carex Plant; D002681:China; D019015:Geologic Sediments / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D006109:Poaceae; D012987:Soil / Q000737:chemistry; D013455:Sulfur / Q000032:analysis*; D053833:Wetlands
chemical_list: D012987:Soil; D010758:Phosphorus; D013455:Sulfur; D009584:Nitrogen