“…Spatial heterogeneity of soil organic carbon (SOC) storage and flux is a general characteristic of terrestrial ecosystems over large areas (horizontal variation) and within complex landscapes (vertical variation) (Burke et al, 1991;Raghubanshi, 1992;Schimel and Burke, 1993;Schimel et al, 1996;Kern et al, 1997). Maps of tropical soils, however, often fail to represent this variation, due, at least in part, to the limited availability of spatial data at fine spatial resolutions (Band et al, 1991;Mudrick et al, 1994;Silver et al, 1994;Kern et al, 1997).…”