Effects of Land Use on Ecosystem Service Function of the Songhua River basin in Harbin Region

Rapid land use pattern change has taken place in Songhua River basin of old industry base in northeast region of China over the past decades in Harbin region. In this paper, changes in land use pattern in this region were analysed by using Landsat TM data in 1989 and 2007, to quantitatively explore the spatiotemporal LUCC (land use and cover change) characteristics, and based on this information, the regional ecosystem service value was estimated. Cropland and unused land decreased, while built-up land increased greatly. The greatest change rate occurred in water bodies but the least occurred in cropland. The ecosystem service value increased 4.8496×10⁸ yuan, with increasing range of 8.3285%, cropland turned into forestland occurred the greatest positive contribution rate, accounted for 18.9437%, while forestland turned into cropland occurred the greatest negative contribution rate, accounted for 10.2426%. The increase of built-up land impacted the ecosystem service value and ecological environment negatively, and the increase of forestland and water body and the decrease of unused land improved the ecological environment and its ecosystem service values. Those improving the ecological environment were from other types of land use to forestland and water body, however, those worsening the ecological environment were from forest and grassland to cropland and built-up land.