Varieties of active soil organic carbon of four forest types with varying incubation temperatures in Fengyang Mountain.

Abstract

As an important part of the active soil organic carbon (SOC) pool, microbial biomass carbon (MBC) is the impetus and key to nutrient and energy cycling in the soil ecosystem. To provide important scientific references for forest soil carbon sequestration and greenhouse gas emission in this region, the warming effect on forest soil MBC and dissolved organic carbon (DOC) were determined using an incubation experiment. The content dynamics of MBC and DOC of an evergreen broadleaf forest, a Cunninghamia lanceolata forest, a mixed coniferous and broadleaf forest, and a Cryptomeria fortunei forest in the National Nature Reserve of Fengyang Mountain were studied using an incubation experiment at 10℃, 20℃, and 30℃. Results showed that SOC and DOC in the Cryptomeria fortunei forest were significantly higher (P 20℃ > 10℃; whereas, DOC was 10℃ > 20℃ > 30℃. For the same temperature, MBC and DOC in the evergreen broadleaf forest as well as the mixed coniferous and broadleaf forest declined larger on the whole than in the C. lanceolata forest and the C. fortunei forest after the 56 days of incubation experiment.