The Effect Of Plant Process On Soil Organic Carbon Content In Shallow Soil Profile

Soil organic carbon plays an important role in terrestrial ecosystem carbon pool, and has profound effect on soil physical, chemical and biological properties. Identification of the let, absorbability and sequestration accurately of the terrestrial ecosystem for CO₂ in different plant processes has important sense to evaluate the source and sink mechanism of soil carbon.The paired plots with same elevation, slope direction and soil type of the plantation, grassland and upland in Ningxia Guyuan and Liaoning Dalian were chosen, and the organic carbon and water content in shallow soil profile and plant biomass of different plant processes were studied. The results showed that the organic carbon and water contents in shallow soil profile of plantation were higher than of which grassland and upland significantly, meanwhile the distribution of organic carbon and water content presented a depressed trend with soil depth, and it had a evident decrease of organic carbon and water content in different layers of plantation and shrubbery. The soil organic carbon and plant biomass will be accumulating in plant growth process. The carbon contents of branch and leaf were higher, and that of the forest floor and vegetation root were lower. The distribution of root carbon content in different layers had close correlation with soil carbon accordingly. It was figured out that the soil water content and plant biomass were the key factors to affect the soil organic carbon content.Set up mathematics models of soil organic carbon, taking soil carbon content as objective character, and soil water content, soil density, plant biomass and soil depth as effect factors. Assessed the effect of plant process on soil organic carbon synthetically, and supplied consults to estimate soil organic carbon content exactly.