Analysis on land use in riparian zone of Bielahong River in Sanjiang Plain in 1986,1995,2000 and 2006

Supported by remote sensing and geography information systems, the land use patterns of riparian zones of Bielahong River in the Sanjiang Plain were analyzed using TM imageries in 1986, 1995, 2000 and 2006. The influence of human activities on the land use patterns of riparian zones of Bielahong River were investigated too. The results showed that in the riparian zone of Bielahong River, farmlands were mainly distributed beyond the distance of 2 km from the river, while marshes were within the riparian zone of 1 km from the river; forest lands were concentrated in the the riparian zones of 1-8 km from the river. From 1986 to 2006, within the riparian zone of 1 km from the river marshes were relatively remained intact, but in the riparian zones of Bielahong River of 1-8 km from the river, the impact of human activities turned to be intensive. During 2000-2006, the impact of human activities in the riparian zones was increasing and moving forwards to the river, by reclaiming marshes, grass lands and forest lands into farmlands. It harmed wetland ecosystem in the riparian zones of Bielahong River. More attention should be paid to the protection of riparian zones of Bielahong River of 1-2 km from the river.