OALib Journal期刊
ISSN: 2333-9721
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土地利用监测适宜尺度选择方法研究———以塔里木河流域为例
DOI: 10.11821/xb200706011, PP. 659-668
Keywords: 适宜尺度,土地利用监测,归一化尺度方差,景观指数,塔里木河流域
Abstract:
适宜尺度选择是生态学、地理学等学科的重要问题之一。在不同的研究目的下,尺度选择的方法和标准也随之变化。以塔里木河流域20世纪50年代土地利用数据为例,将面积作为尺度选择的参数,统计斑块面积分布直方图,然后计算9种比例尺(12000000,11000000,1500000,1250000,1100000,150000,125000,110000和15000)下的归一化尺度方差,最后结合Shannon-Weaver景观多样性指数、Simpson多样性指数和分维数补充归一化尺度方差的结果,探讨塔里木河流域土地利用的空间分布特征和尺度规律。结果如下①归一化尺度方差值显示塔里木河干流50年代土地利用监测适宜尺度为150000比例尺(约20km×20km网格大小),除沙地适宜尺度在1100000比例尺外,有林地、灌木林地和盐碱地的适宜比例尺均在150000比例尺上;②Shannon-Weaver多样性指数、Simpson多样性指数和分维数结果表明盐碱地的多样性指数的适宜尺度与归一化尺度方差结果相同,沙地的多样性指数与归一化尺度方差的适宜尺度域相同,有林地和灌木林地多样性指数最优尺度在110000比例尺与归一化尺度方差结果不同;③沙地和盐碱地的分维数在110000比例尺处有明显的上升,沙地达到最大值1.35,而在其他尺度分维数值接近,有林地和灌木林地则在各个尺度分维数值接近,且值不超过1.2。
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