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《Journal of Northeast Forestry University》 2011-01
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Influence Factors of Wetland Cultivation in Naoli River Watershed of Sanjiang Plain

Yao Yunlong,Lü Xianguo(Key Laboratory of Wetland Ecology and Environment,Chinese Academy of Sciences,Changchun 130012,P.R.China);Yu Hongxian(Northeast Forestry University);Wang Lei(Key Laboratory of Wetland Ecology and Environment,Chinese Academy of Sciences)  
Wetland cultivation and its influence factors in Naoli River watershed,a typical region in Sanjiang Plain,were analyzed by DEM data,relief data and data of land use and land cover for five periods of time from 1954 to 2000 obtained by RS/GIS technology.Results showed that the area of wetland in 2000 reduced to 36.7% of the original size in 1954,and nearly 80% of the area was turned into cropland.Natural environmental factors and the construction of farms had important impacts on the wetland cultivation process.The wetland distributed at different altitudes and different slope gradients were cultivated to different land use types.Forest land was distributed on the slope with highest slope gradients,followed by residential land,cultivated land,grassland and water body.As viewed from geomorphological features,wetland cultivation abided by a process from high alluvial flat to river terrace,and then to low alluvial flat.From the perspective of the farm construction,the distance between the cultivated wetlands and the farms gradually increased over the period of 1954-1995,and wetland encroachment focused on the surrounding of farms over the period of 1995-2000.
【Fund】: 国家自然科学基金重点资助项目(40830535);; 中国科学院湿地生态与环境重点实验室开放基金资助项目(WELF-2009-B-001);; 中央高校基本科研业务费专项资金资助项目(DL10BA01)
【CateGory Index】: P951
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