[Distribution and transferring of carbon in kast soil system of peak forest depression in humid subtropical region].
Taking Guilin Yaji Karst Experiment Site as an exemple and with the methods of field monitoring and laboratory analysis, this paper studied the distribution and transferring of carbon in the karst soil system of peak forest depression in the humid subtropical region of China. The carbon pools in biomass, litters and soil organic matter(SOM) and their mobility as expressed by oxidizability and decomposition rate of SOM, the concentration of soil CO2 and the emission rate of CO2 from soil were investigated. The mobile carbon pool in the system supplied a rich source of CO2, which drived the karst process. When active karst process happened in Spring and Summer, over 60% of carbon in the output water was derived from soil CO2, as traced by delta 13 C distribution in the system. Therefore, owing to the carbon transfer in the pathway of air-plant-soil-water, karst process took place rather under soil-rock-water interface than under air-rock-water interface. Thus, the epigenetic karst process was driven and accelerated by soil as an interface of carbon environmental geochemistry.
Pan
G
G
College of Resources and Environment, Nanjing Agricultural University, Nanjing 210095. gxpan2@jlonline.com
Sun
Y
Y
Teng
Y
Y
Tao
Y
Y
Han
F
F
D002244:Carbon / Q000378:metabolism*; D002980:Climate; D012987:Soil / Q000032:analysis*; D014197:Trees / Q000502:physiology*
D012987:Soil; D002244:Carbon