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Format:
Print
Author:
Ishee, Eulaila Rae
Dept./Program:
Plant and Soil Science
Year:
2011
Degree:
MS
Abstract:
Lake Champlain has persistent algal blooms associated with excess phosphorus (P) from the landscape. Streambank erosion is ubiquitous throughout the Champlain Basin with 74% ofVennont stream reaches classified as unstable. The P contribution of streambank erosion has not been well quantified, yet could be a significant source of nonpoint P. The objectives of this study were to 1) assess the variability in total P (TP) and soil test P (MM-P) for eroding riparian soils across a large study extent and to depth; 2) relate TP and MM-P with soil physical and chemical properties, including texture, AI, Ca, and Fe; 3) relate TP and MM-P to landscape parameters, including land use/land cover (LULC), landscape position, soil type and parent material; and 4) quantify the potential P load from eroding streambanks.
Soil samples were taken from 76 erosion features to a depth of 90 cm on 4 streams in Chittenden County, Vermont and analyzed for texture, total P, Modified-Morgan's P, and total aluminum, calcium, iron, and manganese. Landscape parameters were assessed using available spatial databases for LULC, parent material, soil type, landscape position. Mean concentrations of TP and MM-P were similar among the four streams and through depth. A strong relationship found between Ca and TP in excess of apatite ratios suggests apatite-P could be a common P form in these soils. Low MM-P concentrations indicate that eroded streambanks may act as sinks rather than a source of P. Soil test P (MM-P) concentrations were not related to TP. Specific landscape parameters including LULC, landscape position, and parent material correlated with TP and MM-P. Eroding streambank soil from four streams in Chittenden County contained a total of 12.7 MT (7.1 - 19.4) of TP and 39.8 kg (36.2 -43.1) of MM-P. Estimated potential P load from eroding streambanks from 1999-2004 averaged 54% of total non-point load for three stream corridors, ranging from 22 to 84% for individual streams.