基于空间分析的甘肃长城烽燧动物病害空间分布特征

Spatial distribution characteristics of beacon flint diseases in the Gansu section of the Great Wall based on a spatial analysis

基于ArcGIS平台,应用平均最近邻、热点分析等空间分析方法,研究甘肃省内受动物活动影响烽燧的空间分布特征及其影响因素.结果表明,烽燧病害在空间上表现为聚集型且有正的空间自相关,呈现山丹县、环县、高台县、永昌县、天祝县和肃南县局部聚集的热点区,病害呈多中心分布形态,高密度核心位于张掖山丹地区,与热点分析结果相印证.病害的分布特征受到区域自然环境和经济结构的双重影响,主要发生在植被指数0.2~0.7,地面坡度<15°的区域,河西走廊农牧业发达的几个县区病害更集中.

Based on the ArcGIS platform, spatial distribution characteristics and influencing factors of beacon towers affected by animal activities in Gansu Province were studied by means of a spatial analysis,employing the average nearest neighbor index and the Getis-Ord Gi* analysis method. The results showed that beacon diseases were spatially clustered and had a positive spatial autocorrelation. Shandan,Huanxian, Gaotai, Yongchang, Tianzhu and Su’nan counties were six hot spots. The diseases presented a polycentric distribution, with the high-density core located in Shandan area of Zhangye city, which was confirmed by the results of the Getis-Ord Gi* analysis. The distribution characteristics of the disease were influenced by the regional natural environment and economic structures that mainly occurred in there, with a normalized difference vegetation index 0.2-0.7 and ground slope less than 15°. The diseases were more concentrated in counties with developed agriculture and animal husbandry in the Hexi Corridor.