The Spatial Differentiation Of Recent Organic Carbon Accumulation Rate In Hani Peatland:Links To Plant Supply Sources

Recent rate of carbon accumulation (RERCA) is an important parameter to study the change of Global Carbon Pool and the process of Carbon Cycling. The decomposition of the plants can reduce RERCA. The difference combination types and species of marsh plants has different effects on RERCA. This paper is used for explore the influence mechanism of marsh plants which include plant decomposition, plant community and plant species to RERCA.We choosed hummock, ridge margin and RMlow three types of habitats in Hani peatland in Liuhe county, Jilin province. We measured the radioactivity of 210Pb and 137Cs by non-destructive y-ray spectrometry (GHGe), and established the chronologies of the three cores. The recent chronologies respectively are 476 year,499 year and 233 year which were constructed using the constant rate of supply model (CRS).Then we calculated the RERCA based on the chronologies, dry bulk density and organic carbon content (OC) which were measured by physicochemical analysis. These three cores’ RERCA are 73.8 g C m-2yr-1,83.9 g C m-2yr-1 and 270.6 g C m-2yr-1 respectively.The Quadrat and Leaf Count Macrofossil Analyses is used to reveal vegetation assemblages in peat profiles,We have drawed the plant distribution atlas by the QLCMA methods then deduced the plant community succession process, and estimated the organic carbon loss of the same plant community because of plant decomposition. The effects of marsh plants’ difference combination types and species on RERCA were revealed that based on One-way ANOVA and Bivariate Correlation. We found a negative correlation between RERCA and Sphagnum fuscum, as the herb. A positive correlation between RERCA and Sphagnum palustre,as the Wood. The Polytrichum has no correlation with RERCA. We also compared the difference of same species in the different habitat.Decomposition of plant, plant community and plant species abundance is a new field in the study of global carbon pool change and the carbon cycle process. This research reveals the spatial differentiation of RERCA caused by supply sources, which provides a reference for the next step that we study the mechanism of organic carbon deposition rate.