Patterns of ecoenzymatic stoichiometry on types of forest soils form different parent materials in subtropical areas

The stoichiometry of ecoenzymatic activity can be used as an important indicator to measure the energy of soil microbes and soil nutrient resource constraints, and is one of the hotspot issues in the field of ecology. However, the role and mechanism of soil parent material and forest types in regulating the stoichiometry of ecoenzymatic activity is uncertain.In this study, we investigated the variations in soil properties, microbial biomass carbon, nitrogen, phosphorus, and soil enzyme activity in the soils of a Castanopsis carlesii and Cunninghamia lanceolata forest developed from two kinds of parentmaterials(sandstone and granite). These study sites were expected to reveal the patterns of ecoenzymatic stoichiometry on two types of forest soils developed from different parent materials in subtropical areas. The results showed that soil acid phosphatase activity(AP) was significantly higher in granite plots than in sandstone plots, and the values of βG:AP and NAG:AP in granite plots were significant lower than that of sandstone plots. In granite plots, the values of βG: AP and NAG:AP were significantly higher in Castanopsis carlesii forest than Cunninghamia lanceolata forest, and in sandstone the values of βG:AP and NAG:AP were significant higher in Cunninghamia lanceolata forest than Castanopsis carlesii forest. In addition, the correlation analysis suggested that soil enzyme activity and the stoichiometry of ecoenzymatic activity were controlled by soil abiotic factors and biotic factors, and redundancy analysis(RDA) showed that soil pH, total phosphorus(TP), and microbial biomass carbon(MBC) accounted for the variation in soil enzyme activity and ecoenzymatic stoichiometry by 56.9%, 27.9%, and 12.3%, respectively. In summary, the ecoenzymatic stoichiometry could reflect the limitation of phosphorus in different forests, and they were more serious in granite than in sandstone. Thus, we suggested that the soil parent material and forest type should be considered as the important factors in forest management in the future.