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Título:
Potential for P Release in Streambank Soils of Different Land Uses in the Missisquoi River (Vermont, USA)
Autor/es:
PERILLO, V.L.; BALLING, C.; ROSS, D.S.; WEMPLE, B.C.
Lugar:
Phoenix, AZ
Reunión:
Congreso; 2016 Annual Meeting "Resilence Emerging from Abundance and Scarcity"; 2016
Institución organizadora:
American Society of Agronomy | Crop Science Society of America | Soil Science Society of America
Resumen:
The growth of algae blooms in Lake Champlain ?located in between the states of Vermont and New York in the United States and the province of Qu├ębec in Canada? during the summer months is limited mainly by phosphorus (P). Erosion of streambank soils has been found to be a large source of P inputs entering the Missisquoi River and its tributaries, ultimately discharging it into the lake. In this work, we characterized the P of soils from four different land uses along the Missisquoi River and their corresponding streambanks: silage corn, hay meadow, wetland and forest. We measured total phosphorus, plant-available phosphorus and the degree of phosphorus saturation (DPS). The latter two measurements are predictors of potential bioavailability. Forest soils were low in total phosphorus when compared to the average P content in Vermont soils; while soils in corn, hay and wetland were elevated in total P. With the exception of forest streambank soils, the total P of the corresponding streambanks of each land use was statistically significantly lower. Plant-available phosphorus was very low in forest, wetlands, and all the streambanks of the different land uses; while higher than the optimum plant available P recommended for soils in Vermont in corn and hay fields. The DPS averaged 36% in the corn fields, but was less than 21% in all of the streambanks. The combination of low plant available P and low saturation suggests that the streambank soils will not release significant amounts of P if eroded into the adjacent streams.
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