Stock characteristics of soil organic carbon pools under three subtropical forests in South China

[摘要] Vegetation biomass and soil organic carbon (SOC) pools for the three representative forest types, i.e. conifer forest (CF), mixed conifer and broad-leaf forest (CBF), evergreen broad-leaf forest (EBF) in South China were investigated. We found that SOC stock of the three chief forest ranged from 55.54 to 151.16 MgC•ha-1, and it increased with increasing vegetation biomass under the same type forest within 100cm depth. The organic carbon contents at an equivalent level of forest maturity tended to be in the following decreasing order: EBF > CBF > CF, various active organic carbon (AOC) fractions in the 0-20cm topsoil layer tended to be in the following decreasing order: light fraction carbon (LFC) ≈ particulate organic carbon (POC) > easily oxidisable carbon (EOC) > microbial biomass carbon (MBC) > water-soluble carbon (WSC). At an equivalent level of forest maturity, there was a trend that each of these five AOC fractions increased from CF to CBF to the EBF.

[发布机构] South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou; 510655, China^1;School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou; 510275, China^2

[效力级别] 生物科学

[关键词] Conifer forests;Microbial biomass carbon;Organic carbon contents;Particulate organic carbon;Soil organic carbon pools;Subtropical forests;Vegetation biomass;Water-soluble carbons