 The study found that the upper layer of soil was significantly different from the lower layers due to the vegetation present. The upper layer was also more heavily fractionated than the lower layers, suggesting that it had been exposed to greater amounts of evaporative loss. Additionally, the study showed that the amount of evaporation varied depending on the type of vegetation present. This article was authored by M. Springer, D. Tetzlaff and C. Solzby.