Metabolic Characteristics of Soil Microbial Community in Different Stands of Subtropical Evergreen Broad-leaved Forest at Chaiwan Natural Reserve in Qimen, Anhui
In order to reveal the relationship between soil microbial function diversity and stand structure, two different stands of evergreen broad-leaved forest in Chaiwan Natural Reserve in Qimen County, Anhui Province, were selected. One stand (P1) was dominated by Castanopsis sclerophylla, and another (P2) dominated by Cyclobalanopsis glauca, Pinus massoniana and Castanea seguinii, and each set three repeating plots. The relationship between functional diversity of soil microbial community and stand structure was discussed by Biolog method. The results showed that the concentrations of soil NH4+-N, NO3--N, dissolved organic carbon (DOC) and nitrogen (DN) in P2 were higher than in P1 with no significant difference. The soil nutrients in 0~10 cm soil layer were significantly higher than in 10~20 cm. After 48 h of inoculation, the AWCD values of 0~10 cm and 10~20 cm soil layers were greater in P2 than in P1. The Shannon-Wiener (H), Simpson (D), Mclntosh (U) and richness (S) indices in 0~10 cm soil layer were higher in P2 than in P1, with significant differences in H' and D between P2 and P1 (P=0.03, P=0.02). There were no significant differences in those indices in 10~20 cm soil layers between P1 and P2. In 0~10 cm soil layer, the high utilization by soil microbes were alcohols and carbohydrates in P1, while were carbohydrates and esters in P2. In 10~20 cm soil layer, the high utilization by soil microbes was alcohols in P1, while amines and alcohols in P2. The results of redundancy analysis (RDA) showed that NH4+-N, stand basal area, richness index, soil water content, DOC, DN had great effect on soil microbial carbon-source utilization. The microbial carbon-source metabolism was positively correlated with NH4+-N, richness index, soil water content, DN. There were negative cor-relations between microbial carbon-source metabolism and stand structure parameters except for richness index. The result indicates that the soil microbial metabolism is controlled by stand structure in this subtropical evergreen broad-leaved forest.
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