Abstract:

It is important to research on the distribution rule of the regional soil carbon

pool for the study of global change, soil fertility and ecosystem function appraisal. The

domestic and foreign scientists do the research by using models and the second soil survey

data for lack of longterm actual material. This article studies several factors affecting

soil carbon distribution by using ecologicalgeochemistry investigation data in Dongting

lake district. The study revealed that the regional soil carbon quantity is in the high

intermediate level of our country, and that the geological landform is the most important

factor  affecting the distribution of soil inorganic carbon quantity, and the soil type is

also an influential factor. The soil erosion has little effect on TOC in the surface layer.

The utilization of land by forestation, and the prevention and control of soil dives

nurtures are advantageous to the soil carbon storage. The temporalspatial distribution

rules of the deposition of TOC and so on indicate that the regional environmental variation

is the response to the global environmental variation. This research provided a basis for

the study of regional land utilization, soil carbon fixation and global environment

variation.

Key words:

Key words: SOC; Ecogeochemistry; Land use; temporalspatial distribution; Carbon density;