Abstract: To classify the nutrient dynamics of litter-soil system during litter decomposition, a 52-day laboratory experiment was conducted to simulate the litter decomposition process of Spartina alterniflora, Suaeda glauca, and Phragmites australis in coastal wetlands of Jiaozhou Bay. The contents of organic carbon (TOC), nitrogen (N) and phosphorus (P) in litter and soil were measured. The results showed that carbon loss of S.alterniflora, S. glauca, andP. australis litter after 52-day incubation accounted for 24.44%, 74.20%, and 49.75% of the initial total C contents, respectively. There was a net C accumulation in the soil. Nitrogen in the S. alterniflora litter had a net accumulation, but an opposite trend was found in the S. glauca litter. In addition, N in the P. australis litter accumulated first and then released. The N loss accounted for 37.93% and 4.81% of the initial litter N content of S. glauca and P. australis, respectively. Nevertheless, N in soil had a net accumulation during incubation. Phosphorus had a net release both in litter and soil. The P release from S.alterniflora, S. glauca, and P. australis litter accounted for42.37%, 59.27% and 28.48% of the initial total P content, respectively. The dynamics of C, N, and P in litter-soil system were closely related to litter and soil properties, which were mainly determined by microbial activity and nutrient demand.

Key words: PRCC, mutual information, meteorological factor, design drainage modulus, runoff yield model coupling of excess infiltration and excess saturation