Soil in midwestern US is eroding 10 to 1,000 times faster than it forms, study finds umassamherst
Erosion degrades soils and undermines agricultural productivity. For agriculture to be sustainable, soil erosion rates must be low enough to maintain fertile soil. Hence, quantifying both pre-agricultural and agricultural erosion rates is vital for determining whether farming practices are sustainable. However, there have been few measurements of pre-agricultural erosion rates in major farming areas where soils form from Pleistocene deposits.
The median pre-agricultural erosion rate of 0.04 mm yris orders of magnitude lower than agricultural values previously measured in adjacent fields, as is a site-averaged diffusion coefficient calculated from erosion rate and topographic curvature data. The long-term erosion rates are also one to four orders of magnitude lower than the assumed 1 mm yrsoil loss tolerance value assigned to these locations by the U.S. Department of Agriculture.
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