
Agricultural and Biosystems Engineering Publications
Document Type
Article
Publication Date
2008
Journal or Book Title
Agroforestry Systems
Volume
75
Issue
1
First Page
17
Last Page
25
DOI
10.1007/s10457-008-9134-5
Abstract
Agroforestry buffers in riparian zones can improve stream water quality, provided they intercept and remove contaminants from surface runoff and/or shallow groundwater. Soils, topography, surficial geology, and hydrology determine the capability of forest buffers to intercept and treat these flows. This paper describes two landscape analysis techniques for identifying and mapping locations where agroforestry buffers can effectively improve water quality. One technique employs soil survey information to rank soil map units for how effectively a buffer, when sited on them, would trap sediment from adjacent cropped fields. Results allow soil map units to be compared for relative effectiveness of buffers for improving water quality and, thereby, to prioritize locations for buffer establishment. A second technique uses topographic and streamflow information to help identify locations where buffers are most likely to intercept water moving towards streams. For example, the topographic wetness index, an indicator of potential soil saturation on given terrain, identifies where buffers can readily intercept surface runoff and/or shallow groundwater flows. Maps based on this index can be useful for site-specific buffer placement at farm and small-watershed scales. A case study utilizing this technique shows that riparian forests likely have the greatest potential to improve water quality along first-order streams, rather than larger streams. The two methods are complementary and could be combined, pending the outcome of future research. Both approaches also use data that are publicly available in the US. The information can guide projects and programs at scales ranging from farm-scale planning to regional policy implementation.
Access
Open
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Tomer, Mark D.; Dosskey, Michael G.; Burkart, Michael R.; James, David E.; Helmers, Matthew J.; and Eisenhauer, Dean E., "Methods to prioritize placement of riparian buffers for improved water quality" (2008). Agricultural and Biosystems Engineering Publications. 314.
https://lib.dr.iastate.edu/abe_eng_pubs/314
Comments
This article is from Agroforestry Systems 75, no. 1 (2009): 17–25, doi:10.1007/s10457-008-9134-5.