Performing Department
(N/A)
Non Technical Summary
Current forest riparian protection practices within California and Washington mandate continuous buffer zones of relatively uniform width along all fish-bearing streams and along the lower reaches of many headwater streams. The scientific basis for most of these rules is typically drawn from broad trends and average conditions that often do not reflect actual conditions and ecosystem functions at the site-scale. There is growing interest within the forestry sector toward (and substantial scientific support for) using more site-specific information in the design of riparian buffers that will lead to more ecological diversity and improved overall riparian function for aquatic communities (especially salmonids and other endangered species). However, accepted cost-effective methods for evaluating and designing more active riparian management practices are generally lacking, and thus the ability to obtain regulatory approvals for site-based planning is limited, and filled with uncertainty. The result is continued reliance on state-wide rules despite the recognition of unintended negative consequences from such practices. The Explicit Riparian Design (ERD) Method Project proposes to provide a standardized method by which ecologically and economically effective buffer zone management practices can be determined by specific reach- and watershed-scale site conditions. The ERD Method will establish methods for evaluation and forecasting likely responses in several key riparian ecosystem exchange functions (tree growth and wood debris supply, nutrient cycling, thermal regulation, sediment supply, etc.) given site-specific information about the existing stand conditions and growth potential. It will set desired resource objectives and provide guidance for the priorities among competing objectives. It will also facilitate dialog with key agency staff so that the methodology can be accepted as a functional equivalent to existing regulations (both states currently have rules allowing alternative planning processes that the ERD will be designed to support). Once the ERD is fully developed, landowners will have a vetted procedure for the design of site-specific riparian practices that can maintain, restore and/or enhance ecological functions (e.g. thermal regulation, habitat development, etc) while reducing risks that may harm these functions over time (e.g. catastrophic fire, windthrow, infestation, etc). This will allow landowners to more efficiently manage the timber resource value from their lands while improving overall watershed and riparian response for fish, wildlife and water quality objectives. The ERD will also establish functional controls that will provide agency staff with greater confidence that proposed riparian management actions will not ultimately impose harm to beneficial uses and other ecosystem functions. These benefits will provide the context that will support more ecologically-based riparian management practices that can be used by consultants, landowners and others interested in more effective forest stewardship.
Animal Health Component
(N/A)
Research Effort Categories
Basic
(N/A)
Applied
25%
Developmental
75%
Goals / Objectives
The purpose of this research is to develop a site-specific approach to riparian management (i.e., Explicit Riparian Design - ERD) that will allow landowners to move beyond simplistic environmental protection strategies toward dynamic management for ecosystem maintenance, restoration and enhancement. Our research objectives are to: 1) Develop standardized assessment methods to: a. Identify the relative importance and key factors that drive riparian functions at a given site, b. Establish the channel and stream ecological sensitivity to local (site) and upstream inputs for wood, heat, water, sediment, nutrients, and biotic/nutrient functions. c. Predict existing and potential future stand characteristics and growth potential of the site. 2) Combine the assessment tools into a coherent analysis procedure (ERD) that can be applied at a range of appropriate spatial scales and geographic regions, 3) Solicit peer review of the ERD conceptual approach and engage stakeholders in a dialog to gain agreement regarding its goals & objectives, key principles, standards for acceptance, general approach, appropriate tools and analytical techniques, and 4) Develop the process such that it can be a cost-attractive alternative to uniform, prescriptive rules that can be applied by landowners. As such, the process must be relatively straightforward, and the outcome must support proposed actions by generating sufficient confidence regarding the outcomes and risks.
Project Methods
Tasks and schedule for Phase I development of the ERD: 1. Supplemental Literature & Peer Review. This task will involve a supplemental review of information and resources to address questions and issues not addressed in Liquori et al (2008). We will identify and engage industry and agency stakeholders that are interested in collaboration with the ERD development process. 2. Develop a preliminary conceptual framework for the ERD - This task will identify the Key Exchange Functions that will be covered by the process, and will likely include tree growth & mortality, instream wood supply, sediment supply & routing, thermal regulation, nutrient cycling & biologic food webs. 2a. Compile and compare the existing set of available analytical tools for addressing key riparian exchange functions. Such tools may include known empirical relationships, computer models, maps, classification systems, existing assessment indices, etc. 2b. Characterize conceptual approaches for evaluating the relative importance and key factors that are driving riparian functions at a site. The methods will identify a) the physical/biological mechanisms, b) site sensitivity for each exchange function, c) the connectivity of each function to the aquatic ecosystem, and d) the potential of the stand conditions to achieve these functions. 2c. Characterize conceptual approaches for assessing existing and potential future stand characteristics, including ecological opportunities/consequences, potential timber yield, and costs provided by various design alternatives (including no-treatment options). 2d. Combine these tools into a coherent analysis procedure that can be applied at a range of appropriate spatial scales. - we will establish an approach for Setting Explicit, Site-Specific Resource Objectives for each key exchange function that is suitable to the site conditions. During Phase 1, we will evaluate the feasibility of different forms of resource objectives. 3. Reporting & Documentation. - Feedback from the review process will be used to asses ERD feasibility and to identify regulatory revisions necessary to accommodate ERD. This assessment will include an evaluation of cost effectiveness relative to uniform prescriptions. The final document will summarize the work done to date, and will be available on a website for access by stakeholders and/or others. Following the feasibility and feedback reviews, we will develop a detailed scope of work to develop the full ERD methodology documentation. The next phase scope will include policy staging activities, technical development, and facilitation tasks.