Interannual Changes in the Distribution of Paddy Field in Sanjiang Plain, Northeast China by Satellite Remote Sensing

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  • 衛星リモートセンシングによる中国三江平原の水田面積の経年変化に関する研究
  • エイセイ リモートセンシング ニ ヨル チュウゴク サンコウ ヘイゲン ノ スイデン メンセキ ノ ケイ ネンヘンカ ニ カンスル ケンキュウ

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 The iron supplied by Amur River may keep productivity in Okhotsk Sea, however, recent land use/land cover changes (LUCC) in the Amur River Basin raise the concern to the reduction of iron content transported to the sea through the river. This paper first shows the basin scale land use/land cover changes by satellite imageries, and then try to demonstrate the land use/land cover changes among paddy crop field and wetland in Sanjiang plain, China, as important area of note.<BR> The study uses satellite remote sensing data and China's agricultural statistics, and analyses the spatial variation of paddy field area in Sanjiang Plain.<BR> This study shows the distribution and variation of paddy fields in Sanjiang Plain in the 1980s and in the 2000s using China 1km land use mesh maps. The verification through the calculation of NDWI of Landsat TM data.Compared with 1980s and in the 2000s, there are Jiamusi city and Baoqing county two areas with marked increase of paddy field area. It verified the accuracy of the information of land use in 2000.<BR> This study uses the SPOT / VEGETATION data from 1999 to 2007 to make the spatial distribution chart of paddy field in Sanjiang Plain. The verification is conducted comparing the area of paddy field deduced from the distribution chart with the area of that calculated according to agricultural statistics.

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