城市郊区耕地细碎化及其空间自相关性分析——以河北省保定市新市区为例

Analysis of Fragmentation and Spatial Correlation of Suburban Cultivated Land:A Case Study of the New Urban Area of Baoding City

为研究城市郊区耕地细碎化程度及其空间相关关系,以保定市新市区为例,选取斑块面积指数、斑块形状指数、斑块分散指数3个指标综合反映耕地细碎化程度,并通过全局和局部莫兰指数分析其空间相关性。结果显示:1斑块面积指数空间分异与形状指数类似,总体特征是西部高于东部,斑块分散指数的分布则与之相反;2新市区3个耕地细碎化指数的空间聚集程度顺序为:分散指数>面积指数>形状指数;3斑块面积指数和斑块形状指数的H-H型分布规律相似,主要集中在市区西部,而斑块分散指数H-H型则集中分布于市区周围。结果表明:掌握新市区耕地细碎化空间格局及其空间相关关系可以为耕地集约化利用提供决策支持。

To explore the fragmentation and spatial correlation of suburban cultivated land ,a case study of the new urban area of Baoding City was conducted ,adopting as indexes of cultivated land fragmentation were calculated on the basis of land use change survey .Spatial patterns of cultivated land patch indexes of area ,shape and dispersion were assessed .The correlation among them was described by the Moran＇s I and the Local Moran＇s I .The conclusions are：（1） the regularity of patch area index is that general characteristics of the west is higher than the east ,which is similar to the patch shape index .The patch dispersion index is on the contrary ;（2） the spatial autocorrelation indicated that the accumulation order of three land fragmentation indexes was：patch dispersion index per unit〈patch area index per unit〈 patch shape index per unit ;（3） the regularity of the H-H （high spatialautocorrelations） of patch area index was similar to the patch shape index .The patch dispersion index was on the other side .Results show that mastering the spatial patterns of the cultivated land and the autocorrelations among them can be useful to the intensive utilization of cultivated land .