Soil Fungal Biomass And Diversity Of Community Structure For The Typical Subtropical Forests

The soil fungal biomass seasonal dynamics changes, microbial community structure characteristics were investigated for four types of forests, including one natural forest dominated by Castanpsis carlesii (W-UC) located at Wuyi Mont Nature Reserve and two natural forests dominated by Castanpsis carlesii (J-UC) or by Castanopsis fabri (J-LC) and a plantatin of Cunninghamia lanceolata (J-LP) located at Jianou Wanmulin Nature Reserve, Northern Fujian province, China, using combined analysis mehtods of fungal biomarker ergosterol, phospholipid fatty acid (PLFA) and18S rRNA gene denaturing gradient gel electrophoresis (DGGE), aimed at providing fundmental data and scientific base for understanding fungal functions in the regional soil material cycle. The main results are as follows:(1)The fungal biomass of0-10cm soil depth was higher than that in10-20cm depth in general for the four forests and changed significantly between different seasons, according to the order of autumn>summer>spring>winter. The soil fungal biomass in nature broadleaved forests of Castanopsis fabri was higher than that in Cunninghamia lanceolata plantation forest. At Jian’ou location,the natural broadleaved forest of Castanopsis carlesii fungal biomass was higher than that in forest of Castanopsis fabri. The main soil factors affecting the fungal biomass changed with the soil layers and the seasons.(2)The soil bacteria biomass, fungi biomass and the tatol PLFAs in nature broadleaved forest of Castanopsis fabri (J-LC) and Cunninghamia lanceolata (J-LP) were characterized by J-LC0-10cm>J-LC10-20cm>J-LP0-10cm>J-LP10-20cm, and fungi/bacteria ratio ranged0.14-0.16, and fungal biomass accounted for only6%-8%of the total PLFAs, suggesting that the bacteria were dominant species in two kinds of forest soil. Differences in soil microbial community structure was mainly affected by the vegetation types, while the soil depth showed little effect.(3)The results showed that the structure of fungi community in subtropical forests was abundant, Basidiomycota had the highest proportion, followed by Ascomycota and Zygomycota, Deuteromycota was lowest, relatively. soil fungi diversity index,richness index and evenness index were no significant difference, The structure of fungi community was determined by region and soil depth, both ammonium nitrogen and C/N ratio were important factors.