EFFECTS OF AGRICULTURE RECLAMATION ON THE HYDROLOGIC CHARACTERISTICS IN THE SANJIANG PLAIN, CHINA

1 THE NATURAL ENVIRONMENTAL CHARACTERISTICS The Sanjiang Plain is located in the northeast of Heilongjiang Province, China. Russia borders this region in the north and east. Its total area is 1.088×107ha. The area of plain occupies 61.21％of the total land area and that of hill and mountain amounts to 38.79％of the total land area. It is not only one of the most important regions with large area of fresh water wetlands and with varieties of rare migratory waterfowls, but a…

Effects of agriculture reclamation on the hydrologic characteristics in the Sanjiang Plain, China

The Sanjiang Plain is the largest and most concentrated wetland region in China, the total area is about 1.088 × 10⁷ha with rich marsh resources and biodiversity. Before 1949, the Sanjiang Plain was a large untravelled wild plant and waterfowl habitat, and there were some rare swans, red-crowned cranes and thousands of hydrophytes. From 1950, the local government began to reclaim the marsh in the Sanjiang Plain, built the commodity grain base of Northeast China, and developed the industry of grain processing, animal husbandry, etc. Up to now, there are 54 farms which control 3. 5087 × 10⁶ha agriculture field. The marsh areas are reduced by 1/2; many rare animals and plants are near extinction. The human activities and agriculture reclamation made a great change on the environment, especially made water balance change and regional climate change. So to study and protect the wetland ecosystem and marsh resource are extremely urgent. This paper focus on the hydrology change and climate change before and after marsh reclamation, including evapotranspiration, run off, soil character, micro-climate on both marsh and agriculture field, and the reason that cause seasonal drought, waterlogging and degeneration of marsh. Foundation item: Supported by the National Natural Science Foundation of China (No. 49771002) and the Foundation of the Laboratory of Wetland Process and Environment, Changchun Institute of Geography, the Chinese Academy of Sciences and Key Ninth Five-Year Plan Project of the Chinese Academy of Sciences(No. KZ951-B1-201-03). Biography: Wang Yi-yong (1966 —), male, a native of Gansu Province, associate professor. His research interest includes climate environment of wetland and agriculture meteorology.