Distribution of soil carbon stocks in Canada's wetland and upland forests simulated based on drainage class, topography and remote sensing.

摘要

A quasi three-dimensional hydrological model is integrated into the integrated terrestrial ecosystem carbon-budget model (InTEC) to simulate the impacts of hydrological process on C cycle in forests. Various spatial data including vegetation from remote sensing, climate, soil, Topography, and drainage class are used. Soil is separated into three layers, within which temperature and moisture dynamics were separately simulated. A TOPMODEL-based subsurface saturated flow was modelled to redistribute soil moisture spatially. The soil C and N dynamics were simulated using a modified CENTURY model suitable for forested uplands and wetlands. Compared with data in soil landscape of Canada (SLC) polygon by polygon, the newly developed pixel-based InTEC model can capture 58.9% of spatial variations in soil C. The difference between simulation and SLC data in over 56.3% area is less than 10.0 kg C m −2. It was found that poorly drained regions contribute significantly to current C sinks in Canada's forests.