Resource evolution pattern, land use change and related ecological effect in Hailun City
海伦市资源演化格局与土地利用变化及其生态效应分析

Using Hailun City as a case study site, land use data were collected for 1980, 1995 and 2000, evolution process of land use was analyzed via GIS and field investigations. Theory and method of ecosystem service value was used to evaluate the ecological impact of land use change in the region. The results showed that while farm, urban and traffic land areas increased, those of forest, grassland and wetland decreased. Based on ecosystem service value, ecological effects varied with land use type. Contribution rates to the ecological effects were highest for farmland (43.67% in 2000), followed by wetland (26.32% in 2000) and then forestland (14.69% in 2000). Residential and industrial land had negative contribution rates. Whereas the ecological service functions of gas and climate regulation, waste disposal, soil formation, erosion control, raw material production, recreation and culture declined, those of food production increased from 1980 through 2000. This indicated rapid development of city and grain productivity in the region, on some extent, resulting in the decrease of ecological effect.