A landscape approach to quantifying land cover changes in Yulin, Northwest China
A landscape approach to quantifying land cover changes in Yulin, Northwest China
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DOI：
10.1007/s10661-007-9751-x
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发表时间：
2008-03
影响因子：
3
通讯作者：
Y. Zha;Yan-sui Liu;Xiangzheng Deng
中科院分区：
文献类型：
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作者：
Y. Zha;Yan-sui Liu;Xiangzheng Deng
在这项研究中，我们量化的土地覆盖变化在干旱区的榆林市，中国西北地区1985年和2000年之间，利用遥感和地理信息系统结合景观建模。土地覆盖被映射成20个类别的多时相Landsat TM图像。五个景观指数计算从这些地图上的土地覆盖斑块水平。结果发现，休闲地减少了125 148公顷，而草地和林地分别增加了107 975和17 157公顷。景观异质性、优势度和分维数在15年内变化不大，但景观变得更加破碎，指数从0.56上升到0.58。造成这些变化的主要因素被确定为政府保护环境政策的变化，采矿业的持续增长和城市化。
In this study we quantified land cover changes in the arid region of Yulin City, Northwest China between 1985 and 2000 using remote sensing and GIS in conjunction with landscape modeling. Land covers were mapped into 20 categories from multitemporal Landsat TM images. Five landscape indices were calculated from these maps at the land cover patches level. It was found that fallow land decreased by 125,148 ha while grassland and woodland increased by 107,975 and 17,157 ha, respectively. Landscape heterogeneity, dominance and fractal dimension changed little during the 15-year period while landscape became more fragmented, with an index rising from 0.56 to 0.58. The major factors responsible for these changes are identified as the change in the government policy on preserving the environment, continued growth in mining, and urbanization.