| Abstract: |
Lake Champlain is experiencing elevated phosphorus levels that have a detrimental effect on water quality. Sediment from stream bank erosion is potentially a large source of this pollutant. We are currently characterizing P availability in some floodplain soils of major extent along two stream corridors in Vermont. This study quantifies the spatial variability of P levels vertically in the soil profile and horizontally across the landscape between soil series. Various GIS visualization techniques help to illustrate the range in values within and between soil map units. Additionally, GIS techniques can help pinpoint anomalies in the original soil mapping. Limited funds for stream-bank remediation necessitate targeting funds to those areas that contribute the most to surface water P contamination. Gaining a picture of the range P levels in both agricultural fields and areas unaffected by human fertilizer inputs can help direct management strategies to prevent further P impairment to surface waters. |