黄河三角洲居民点建成区对土地利用格局的时空影响

Temporal-Spatial Effects of Build-up Residential Area in Yellow River Delta on Land Use Pattern

取1986、1996和2001年3个时期覆盖近代黄河三角洲的TM影像为数据源,结合1980年地形图,经监督、非监督分类及人工目视解译,获得研究区各时相土地覆被类型图。运用地形图和TM影像人工目视解译勾画3个时期居民点图,通过3个时期的居民点分布图向外等距离扩展形成辐射状梯度圈,并以此剪裁相应时相的土地覆被类型图,形成不同距离辐射梯度土地覆被类型图,计算各土地覆被类型图的景观指数,分析研究区15年间土地覆被动态过程、居民点动态过程以及居民点变化对景观动态的影响。结果表明,随着居民点建成区面积的增大,其对周围地区影响的范围亦不断增大。

Using TM remote sensing images of yellow river delta in 1986,1996 and 2001 and relief maps in 1980 as data sources,land cover landscape of the studied zone in different years were obtained by supervised classification,non-supervised classification and artificial visual interpretation.The map of residential area in the different years was pictured using TM remote sensing images and relief maps.The radiation transects were set around the residential area by buffer zone techniques,according to which the land cover landscapes of different years were cut out to form land cover landscapes of different radiation distance.The landscape indices were calculated based on the land cover landscapes cut out.Based on these data,the dynamics of land cover landscape and residential area,and the effects of residential area change on landscape in the 15-year period were analyzed.The results showed that the influencing zone of residential area was increased with the increasing of its area.