| Summary: | 碩士 === 國立臺北大學 === 自然資源與環境管理研究所 === 104 === This study combines the stated and revealed preference data to evaluate recreational benefit for mangrove wetlands in the Tamsui river watershed. There are two hypothetical scenarios in contingent behavior (CB), including the travel cost increase 10% and the wetland quality improves. Trip model is estimated with the travel cost data and CB data, and then the willingness to pay (WTP) model is also constructed with the contingent valuation method (CVM) data. Finally, simultaneous equations are estimated to slove preference parameters for trip and WTP models.
In addition, the study uses the choice experiment method to calculate the utilities for various combinations of wetland biodiversity attributes for each individual. On the contrast of the status quo wetland quality, the most and least favored combinations are then treated as the improved and deteriorated wetland quality, respectvely.
Empirical results show that the data-combining model roposed in this study relaxes the restriction of weak complementarity (WC) in TCM and CB, and can thus estimate the use value (UV) and non-use value (NUV). In addition, it also relaxes the restriction of Willig condition imposed in TCM and CB, and can thus estimate the exact welfare measurement-the Hicksian compensating variation rather than the consumer surplus. It is shown that in total respondents are willing to pay NT$ 468 dollars annually to maintain the current quality of mangrove wetlands in the Tamsui river watershed; NT$ 227 dollars for UV and NT$ 241 dollars for NUV.
Wetlands contain lots of ecosystem functions, such as provisioning, regulating, supporting and culture. The empirical results show it is very important to preserving mangrove wetlands in the Tamsui river watershed becasuse wetlands bring people UV and NUV.
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