1. Agricultural Ecology Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China
2. Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350003, China
3. Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada
4. Soil and Fertilizer Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China