Determination of Trade-offs between Wetland Ecosystem Services in an Agricultural Landscape Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/js956k86w

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  • Wetland restoration mitigates effects of agricultural development on water quality, flooding, and habitat loss. Multi-objective optimization for wetland locations and sizes has not included objective functions for water quality, hydrology, and habitat in unison, limiting analysis of trade-offs among these ecosystem services. This study establishes two methods to improve the accuracy of simulating wetland restoration with an optimization-simulation framework for analysis of trade-offs: identification of wetland type and constraining wetland and drainage area configurations to potential field-scale wetlands in the study area. Determination of a wetland habitat type used characteristics of the Hydrogeomorphic Method, and this type was utilized in a land-use/land-cover simulation linked to a species-habitat model. Multi-objective optimization identified optimal wetlands and drainage areas. These wetlands demonstrated redundancy among treatment ecosystem services. Modifying wetlands and drainage areas from the optimally-identified values caused shifts to the trade-off relationships. The habitat objective function conflicted with the treatment objective functions, but at low levels of confidence, demonstrating the necessity to incorporate all the objective function types together into a multi-objective optimization. The methods to increase accurate representation from this study can be incorporated into future studies to improve understanding of wetland ecosystem service processes for land-use planning.
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