Litterfall, nutrient return, and leaf-litter decomposition in four plantations compared with a natural forest in subtropical China Yu Sheng Yang, Jian Fen Guo, Guang Shui Chen, Jin Sheng Xie, Li Ping Cai and Peng Lin Ann. For. Sci., 61 5 (2004) 465-476 DOI: 10.1051/forest:2004040