Abstract:In order to understand the temporal and spatial distribution pattern and stoichiometry characteristics of carbon, nitrogen, phosphorus in litter and soil of Eucalyptus plantation, the contents of carbon, nitrogen, phosphorus in litter and soil of E. urophylla×E. grandis plantation under five forest ages were analyzed. The results showed that the C content in litter was significantly higher than that in soil, and had no significant difference among forest ages. The C content in surface soil (0-20 cm) at 1-year-old forest was the lowest, and that in other soil layers had no significant difference among forest ages. The N content of litter was higher significantly than that in soil, and which at 1-year-old forest was the highest. The N content of surface soil in 7-year-old forest was the highest, which in 1-year-old forest was the smallest. The P content of litter had no significant difference among forest ages except 1-year-old forest was obviously bigger than 3-year-old forest. The P content in soil had no significant difference among forest ages. The C:N in litter increased with forest ages, which was significantly higher than that in soil. The C:N, N:P in litter had no significant difference among forest ages, which were higher than soil. The N content in litter was negatively correlated with C and N contents in soil, and there were significant relation between C:N in litter and C:P, N:P in surface soil. The C and N accumulation in surface soil was restricted by N content in litter. Therefore, it was important in sustainable management of Eucalyptus plantation for reduce N limitation in litter, increase nutrient transfer efficiency and rational application of fertilizer.
