Research and Cumulative Watershed Effects
نویسنده
چکیده
The mandate for land managers to address cumulative watershed effects (CWEs) requires that planners evaluate the potential impacts of their activities on multiple beneficial uses within the context of other coexisting activities in a watershed. Types of CWEs vary with the types of land-use activities and their modes of interaction, but published studies illustrate both descriptive and predictive evaluations of many of these types. Successful evaluations have generally used geomor-phological and ecological approaches based on the understanding of the processes involved. In contrast, most generalized " cookbook " analysis procedures are shown to be unable to assess accumulations of impacts through time, usually cannot evaluate the range of activities and uses that are necessary, and are rarely validated. A general approach to evaluation is proposed, and the types of information available for assessments are reviewed. This version differs from the final report to the Department primarily in editing details, omission of two appendices, addition of two figures, revisions to tables, and inclusion of more detail about cited studies. Trade names and commercial enterprises are mentioned solely for information and do not imply the endorsement of those products or organizations. This publication neither recommends any pesticide uses reported nor implies that they have been registered by appropriate government agencies. Costick provided extremely helpful reviews of the manuscript, and innumerable scientists and land managers (listed, in part, in the Appendix) gave freely of their time for lengthy discussions of ideas, research, and the challenges confronting conscientious land management. Note: This publication was reprinted December, 1998 from a reconstructed layout. It closely resembles the original printing, but a difference in text style has caused a slight shift in pagination. The Table of Contents has been revised to reflect the changes. Also, Figure 4, (previously on page 29) now appears on page 28, and Tables 5 (previously on page 28) appears on page 29.
منابع مشابه
Cumulative Watershed Effects: Caspar Creek and Beyond1
2 Research Geologist, USDA Forest Service Pacific Southwest Research Station, Redwood Sciences Laboratory, 1700 Bayview Dr., Arcata, CA 95521 Abstract: Cumulative effects are the combined effects of multiple activities, and watershed effects are those which involve processes of water transport. Almost all impacts are influenced by multiple activities, so almost all impacts must be evaluated as ...
متن کاملCumulative Watershed Effects of Fuel Management in the Western United States
Fire suppression in the last century has resulted in forests with excessive amounts of biomass, leading to more severe wildfires, covering greater areas, requiring more resources for suppression and mitigation, and causing increased onsite and offsite damage to forests and watersheds. Forest managers are now attempting to reduce this accumulated biomass by thinning, prescribed fire, and other m...
متن کاملCumulative Watershed Effects of Fuel Management in the Western United States
Fire suppression in the last century has resulted in forests with excessive amounts of biomass, leading to more severe wildfires, covering greater areas, requiring more resources for suppression and mitigation, and causing increased onsite and offsite damage to forests and watersheds. Forest managers are now attempting to reduce this accumulated biomass by thinning, prescribed fire, and other m...
متن کاملCumulative Watershed Effects: Then and Now
Cumulative effects are the combined effects of multiple activities, and watershed effects are those which involve processes of water transport. Almost all impacts are influenced by multiple activities, so almost all impacts must be evaluated as cumulative impacts rather than as individual impacts. Existing definitions suggest that to be significant, an impact must be reasonably expected to have...
متن کاملWatershed Analysis in the Federal Arena
The context for watershed analysis Lands to be analyzed Prioritization of watersheds for analysis Relation of the interagency approach to other watershed analysis methods The concept of interagency watershed analysis Goals of watershed analysis Watersheds as analysis units The issue focus Time required for a watershed analysis Consistency and standardization Interagency participation Federal wa...
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تاریخ انتشار 1999