Seasonl changs in microbial biomass, activity and community structure in soil under three subtropical plantion forest.

• 1、State Key Laboratory of Subtropical Mountain Ecology(Funded by Ministry of Science and Technology and Fujian Province)，College of Geographical Science，Fujian Normal University，fuzhou 350007
• 2、Tingxi State Forest Farm of Fujian Province,Xiamen 361199

Abstract：By using fumigation extraction , phospholipid fatty acid (PLFA) and microwell plate methods，this research studied the quantities of soil microbia biomass, community structure and enzyme activity under plantations of three-different tree species in subtropical China. The effects of tree species and seasonal variation on soil microbial biomass, community structure and enzyme activity were analyzed. The results showed that tree species and seasonal variation had significant effects on soil microbial biomass, community structure and enzyme activity. In winter and spring, Total PLFAs, Fungi, GP, GN, AMF and ACT in Acacia confusa Merr were significantly higher than those in Cunninghamia lanceolata and Schima superba, while the differences in summer and autumn were not significant. The highest levels of soil hydrolytic enzyme activity in 3 plantations were observed in autumn and winter. Redundant analysis shows that soil dossolved organic carbon (DOC) content, temperature, and carbon content of litters were significantly correlated with the content of fatty acid. Relevant analysis shows that soil total nitrogen, nitrate nitrogen, mineral nitrogen, dissolved organic carbon (DOC), nitrogen (DON), and the content of available phosphorus were significantly correlated with soil microbial biomass, as well as the activity of β G, NAG and AP.

Keywords： plantation microbial phospholipid fatty acid enzyme activity Seasonal dynamic key