Dynamic characteristics of the decomposition rate and carbon, nitrogen and phosphorus release of the dominant plants in Poyang Lake Wetland

Litter decomposition is an important ecological process in global carbon(C) and nutrient cycling. This process is mainly determined by three factors of interaction, namely, chemical(physical and chemical properties of litter), physical(climate and environment), and biological(microorganisms and invertebrates involved in the decomposition of litter) factor. Under the same climate and site environment, the quality of litter is the internal factor that restricts decomposition. This study aims to investigate the decomposition rate and dynamic characteristic difference of carbon, nitrogen, phosphorus release from the litter of Phragmite, Triarrhena lutarioriparia, Carex. cinerascens Kükenth in Poyang Lake wetland, using decomposition bag technique. The results showed that there were significant differences of the dry mass remaining rates, decomposition rates, and carbon relative return index(CRRI), nitrogen relative return index(NRRI), phosphorus relative return index(PRRI) between three types of plants litter wit