Status of the Riparian ecosystem in the upper San Pedro River, Arizona: application of an assessment model.

Environmental Monitoring and Assessment
Juliet C StrombergJoseph M Watts

Abstract

A portion of Arizona's San Pedro River is managed as a National Riparian Conservation Area but is potentially affected by ground-water withdrawals beyond the conservation area borders. We applied an assessment model to the Conservation Area as a basis for monitoring long-term changes in riparian ecosystem condition resulting from changes in river water availability, and collected multi-year data on a subset of the most sensitive bioindicators. The assessment model is based on nine vegetation bioindicators that are sensitive to changes in surface water or ground water. Site index scores allow for placement into one of three condition classes, each reflecting particular ranges for site hydrology and vegetation structure. We collected the bioindicator data at 26 sites distributed among 14 reaches that had similar stream flow hydrology (spatial flow intermittency) and geomorphology (channel sinuosity, flood-plain width). Overall, 39% of the riparian corridor fell within condition class 3 (the wettest condition), 55% in condition class 2, and 6% in the driest condition class. Condition class 3 reaches have high cover of herbaceous wetland plants (e.g., Juncus and Schoenoplectus spp.) along the perennial stream channel and dense, mul...Continue Reading

References

May 18, 1999·Environmental Management·M L SCOTTG T AUBLE
Dec 17, 2002·Environmental Management·Robert J NaimanLisa C Thompson
May 15, 2004·Environmental Monitoring and Assessment·William G KepnerDavid C Goodrich
Feb 1, 1991·Ecological Applications : a Publication of the Ecological Society of America·James R Karr

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Citations

Jan 12, 2012·Environmental Monitoring and Assessment·Yue CheWeining Xiang

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