Quantification of Phosphorus Transport from a Karstic Agricultural Watershed to Emerging Spring Water
| العنوان: | Quantification of Phosphorus Transport from a Karstic Agricultural Watershed to Emerging Spring Water |
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| المؤلفون: | Ger Shortle, Philip Jordan, David P. Wall, Paul N. C. Murphy, O. Shine, Coran Kelly, Robert Meehan, S. Mechan, Alice R. Melland, Per-Erik Mellander |
| المصدر: | Environmental Science & Technology. 47:6111-6119 |
| بيانات النشر: | American Chemical Society (ACS), 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | Hydrology, geography, Agricultural watershed, Watershed, geography.geographical_feature_category, business.industry, Bedrock, Phosphorus, Aquifer, General Chemistry, Karst, Risk Assessment, Nutrient, Agriculture, Water Movements, Environmental Chemistry, Environmental science, High temporal resolution, business, Groundwater, Environmental Monitoring |
| الوصف: | The degree to which waters in a given watershed will be affected by nutrient export can be defined as that watershed's nutrient vulnerability. This study applied concepts of specific phosphorus (P) vulnerability to develop intrinsic groundwater vulnerability risk assessments in a 32 km(2) karst watershed (spring zone of contribution) in a relatively intensive agricultural landscape. To explain why emergent spring water was below an ecological impairment threshold, concepts of P attenuation potential were investigated along the nutrient transfer continuum based on soil P buffering, depth to bedrock, and retention within the aquifer. Surface karst features, such as enclosed depressions, were reclassified based on P attenuation potential in soil at the base. New techniques of high temporal resolution monitoring of P loads in the emergent spring made it possible to estimate P transfer pathways and retention within the aquifer and indicated small-medium fissure flows to be the dominant pathway, delivering 52-90% of P loads during storm events. Annual total P delivery to the main emerging spring was 92.7 and 138.4 kg total P (and 52.4 and 91.3 kg as total reactive P) for two monitored years, respectively. A revised groundwater vulnerability assessment was used to produce a specific P vulnerability map that used the soil and hydrogeological P buffering potential of the watershed as key assumptions in moderating P export to the emergent spring. Using this map and soil P data, the definition of critical source areas in karst landscapes was demonstrated. |
| تدمد: | 1520-5851 0013-936X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f989ffe9bb9d631b4accf34a3befe483 https://doi.org/10.1021/es304909y |
| رقم الأكسشن: | edsair.doi.dedup.....f989ffe9bb9d631b4accf34a3befe483 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 15205851 0013936X |
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