Stoichiometric Characteristics of Soil Carbon, Nitrogen and Phosphorus Under 12 Tree Species Forests in Sanming City

In order to understand the stoichiometric characteristics of carbon (C), nitrogen (N) and phosphorus (P) of soil under different tree species forests in Sanming City, the surface soil (0-20 cm) under 12 tree species forests planted for 8.5 years in the experimental field of common garden in Sanming Forest Ecosystem and Global Change Field Research Station of Fujian Province was taken as the research object, the contents of soil pH, organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) were determined and their ecological stoichiometric characteristics were analyzed. The results showed that there were significant differences in pH, SOC and TN of soil among different tree species forests (P<0.05), but no significant differences in TP. The variation ranges of C∶N, C∶P and N∶P of soil under different tree species forests were 8.57-12.43, 25.53-47.21 and 2.78-4.36, respectively. Among them, the C∶N and C∶P of soil under Sapindus mukorossi Gaertn. and Cunninghamia lanceolata forests were significantly lower than those of other afforestation species, indicating a faster decomposition rate of organic matter (P<0.05). And the correlation analysis showed that there was an extremely significant correlation between the carbon and nitrogen contents of soil under 12 tree species forests (P<0.01). The total nitrogen of soil mainly affected the N∶P of soil, while the organic carbon mainly affected the C∶N and C∶P of soil.