Mangroves plays important roles on sustaining ecological systems and providing environmental protection from human societies. Various land-use changes in coastal areas are related to the changes of the mangrove ecosystem. To monitor the impacts from the changes. Northern Kaohsiung is one of the most important aquaculture areas. For a long time over sixty years development on the aquaculture, the mangroves and aquaculture have existed as a special cultural and ecological landscape. Using a case study approach with questionnaires, in-depth interviews, direct observation to investigate the status of mangrove growth and the mangrove habitat change historically in the study. We also analysed the sources of impacts to understand the causes of local mangrove diminishing, and assessing which impact will continue to increase.
The results have revealed that after filling and exploitation the coastal areas, the distribution of the Northern Kaohsiung mangroves has changed after Japanese-occupied period. The potential mangrove habitat changed from lagoon shore and claybank into five habitats categories, i.e., a big gutter, common ditch, pond ditch, salt pan wetland and unirrigated farmland. The habitat size changed from small and coherent into large and broken. The aquaculture methods changed over the last 30 years and the cooling-water from natural gas processing factories has been applied on the aquaculture recently, which have caused the mangroves in pond ditch habitat unresisting. At last, this study will divided the sources of impacts into two categories: water sources and non-water sources, then discussed trends of changes of impacts.
Keywords: mangrove, habitat, impact, aquaculture, cooling-water