Spatial and temporal patterns of China's cropland during 1990-2000: An analysis based on Landsat TM data
Spatial and temporal patterns of China's cropland during 1990-2000: An analysis based on Landsat TM data
复制标题
1990-2000年中国耕地时空格局：基于Landsat TM数据的分析
DOI：
10.1016/j.rse.2005.08.012
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发表时间：
2005-10-30
影响因子：
13.5
通讯作者：
Deng, XZ
中科院分区：
文献类型：
--
作者：
Liu, JY;Liu, ML;Deng, XZ
由于缺乏可靠数据，中国耕地面积的估算存在很大差异。在本研究中，我们使用空间分辨率为30米的陆地卫星TM/ETM数据，重建了1990 - 2000年期间中国耕地的时空格局。我们的估算表明，2000年中国耕地总面积为1.411亿公顷，其中包括0.356亿公顷水田和1.055亿公顷旱地。中国各地区耕地分布不均。中国东北地区人均耕地面积多于东南地区和华北地区。1990 - 2000年期间，耕地增加了279万公顷，其中水田增加25万公顷，旱地增加253万公顷。中国东北地区和西北地区耕地面积增加，而华北地区和东南地区耕地面积减少。城市化导致了超过一半的耕地向其他土地用途的转变，而耕地的增加主要是由于开垦草地和砍伐森林。大部分流失的耕地质量好、生产力高，但大部分新增耕地质量差，不太适合农作物生产。全球化以及中国环境的变化正在影响土地利用的变化。协调环境保护与粮食用地需求之间的矛盾，将继续是中国未来面临的首要挑战。（C）2005爱思唯尔公司。版权所有。
There are large discrepancies among estimates of the cropland area in China due to the lack of reliable data. In this study, we used Landsat TM/ ETM data at a spatial resolution of 30 in to reconstruct spatial and temporal patterns of cropland across China for the time period of 1990-2000. Our estimate has indicated that total cropland area in China in 2000 was 141.1 million hectares (ha), including 35.6 million ha paddy land and 105.5 million ha dry farming land. The distribution of cropland is uneven across the regions of China. The North-East region of China shows more cropland area per capita than the South-East and North regions of China. During 1990-2000, cropland increased by 2.79 million ha, including 0.25 million ha of paddy land and 2.53 million ha of dry farming land. The North-East and North-West regions of China gained cropland area, while the North and South-East regions showed a loss of cropland area. Urbanization accounted for more than half of the transformation from cropland to other land uses, and the increase in cropland was primarily due to reclamation of grassland and deforestation. Most of the lost cropland had good quality with high productivity, but most gained cropland was poor quality land with less suitability for crop production. The globalization as well as changing environment in China is affecting land-use change. Coordinating the conflict between environmental conservation and land demands for food will continue to be a primary challenge for China in the future. (C) 2005 Elsevier Inc. All rights reserved.