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This issue's cover: Kurt Johnsen of the USDA Forest Service, Southern Research Station employs an air-knife to remove soil from a Pinus taeda root system. Destructive sampling is time-consuming, but necessary to assess belowground allocation and distribution of carbon in woody roots. Ground-penetrating radar can be used to augment traditional belowground biomass harvests noninvasively. See "Utility of Ground-Penetrating Radar as a Root Biomass Survey Tool in Forest Systems" by J. Butnor, J.A. Doolittle, K.H. Johnsen, L. Samuelson, T. Stokes, and L. Kress, p. 1607-1615. The article is part of a symposium entitled, "Approaches and Technologies for Detecting Changes in Forest Soil Carbon Pools." Photo credit: John Butnor, USDA Forest Service, Southern Research Station.