Analyzing Within-County Hydrogeomorphological Characteristics as a Precursor to Phosphorus Index Modifications
Autor: | D. B. Beegle, Sarah C. Goslee, Jennifer L. Weld, Peter J. A. Kleinman, Tamie L. Veith |
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Rok vydání: | 2018 |
Předmět: |
Environmental Engineering
Watershed Index (economics) Vulnerability 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Available water capacity Soil survey Set (abstract data type) Soil Rivers Range (statistics) Water Pollutants Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology business.industry Environmental resource management Agriculture Phosphorus 04 agricultural and veterinary sciences Pennsylvania Pollution Work (electrical) 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science business |
Zdroj: | Journal of environmental quality. 46(6) |
ISSN: | 0047-2425 |
Popis: | Phosphorus (P) site assessment is used nationally and internationally to assess the vulnerability of agricultural fields to P loss and identify high-risk areas controlling watershed P export. Current efforts to update P site assessment tools must ensure that these tools are representative of the range of conditions to which they will be applied. We sought to identify key parameters available in public GIS data that are descriptive of potential source areas in Pennsylvania and that ensure that modifications of the P Index span all feasible parameter combinations. Relevant soil and topographic variables were compiled for Pennsylvania at 30-m resolution, and areas within 90 m of permanent streams were extracted. Within each county, -means and classification trees were used to identify and create classification rules for topoedaphic groups. Within counties, two to five groups adequately represented near-stream complexity, with available water capacity, hydraulic conductivity, and organic matter being the most important environmental variables. Discontinuities across soil survey boundaries made it impossible to develop clusterings beyond the county level. For county-scale research and management efforts, these groupings provide a manageable approach to identifying representative sites for near-stream agricultural lands. The full set of representative sites across the state enables evaluation of the P Index throughout the full hydrogeomorphic diversity of Pennsylvania. In future work, we can then combine a set of reasonable management practices with each of the main hydrogeomorphological regions resulting from this study and verify the revised P Index against expert knowledge and simulation results. |
Databáze: | OpenAIRE |
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