Abstract:

Soils under three types of vegetation were selected for this study, and samples were analyzed for different fractions of carbon and soil nutrients. It can be found that broad-leaved evergreen forest contained more microbial biomass (MBC) and the ease of oxidation of carbon (EOC) compared with Chinese Fir and Masson Pine stands. Soil water-soluble organic carbon (WSOC) were measured relative lower abundance for Chinese Fir compared with broad-leaved evergreen and Masson Pine forest. The profile distribution of MBC and EOC appeared a decline trend with depth. The percentages that total organic carbon (TOC)presented as WSOC, MBC and EOC were ranged in 0.31%～1.18%, 0.9%～2.51% and 7.03%～29.52% respectively. Soil under Masson Pine forest was the richest abundance in WSOC%, followed by broad-leaved evergreen forest and Chinese Fir was the poorest. EOC% of soil under broad-leaved evergreen was much more than those under the other two forests. Distribution of WSOC of soil from surface to the deep as percentage of TOC was increased greatly, but as for EOC%, the reserve appeared to be true. Soil active carbon were not only significantly correlated to TOC but also interrelated themselves.

Key words: broad-leaved evergreen forest, Masson Pine, Chinese Fir, water-soluble organic carbon(WSOC), microbial biomass(MBC), ease of oxidation of carbon (EOC)