Selection of alternative tree species for coastal protective forest in Hainan Island Based on the functional diversity of soil microbial community

Based on Biolog-ECO plate technology, the carbon source metabolism diversity of different vegetation types and soil microbial communities of different soil layers under 8 single species -dominated communities distributing in 3 coastal areas of Wanning were analyzed. The results showed that the utilization intensity of soil microbe to single carbon source increased with the increase of incubation time, and the utilization intensity of topsoil microbe to the carbon source was greater than that of subsoil. Shannon diversity indexes in two soil layers indicated that Terminalia catappa was the lowest, Mallotus paniculatus was the highest in the topsoil, and Dicranopteris + Melastoma+Rhodomyrtus tomentosa was the highest in the subsoil. The utilization ratio of soil microbial community to 4 kinds of carbon sources varied according to the different vegetation types, and the sugar was the sensitive carbon source to cause the differences of soil microbial metabolism in topsoil, sugars and amino acids were the sensitive carbon sources to cause the differences of soil microbial metabolism in subsoil. There was a positive correlation between the utilization intensity of soil microbial to a single carbon source and its diversity.