Regional Soil Organic Carbon Storage Estimates for Western Oregon by Multiple Approaches

Soil is an important factor in regional and global C budgets because it serves as a reservoir of large amounts of organic C. In our study, we compared six approaches of estimating soil organic C (kg C m −2 , not including the surface organic horizon, hereafter called soil C ) and its spatial pattern in the mountainous, largely forested western Oregon region. The approaches were (i) USDA NRCS pedons, (ii) other pedons, (iii) the State Soil...