基于地统计学和GIS的苜蓿斑蚜种群空间结构分析和分布模拟

运用地理信息系统(GIS)和地统计学方法对宁夏南部固原市原州区不同时期苜蓿斑蚜(Therioaphis trifolii)种群的空间结构进行了分析,并采用普通克立格插值法模拟了苜蓿斑蚜种群空间分布.结果表明:不同时期苜蓿斑蚜种群存在空间相关性,其半变异函数曲线均为指数型,空间格局呈聚集分布,空间变异成分的变化范围为34.13%~48.77%,空间相关范围为8.751~12.049km,聚集程度和方向有从西南向东北方向聚集的趋势.空间分布模拟图能较好地从时间、空间两个角度直观地分析不同时期苜蓿斑蚜种群的动态变化,易于确定同一时期苜蓿斑蚜的发生位置和发生程度.

Spatial structure analysis and distribution simulation of Therioaphis trifolii population based on geostatistics and GIS

Based on geographic information system and geostatistics,the spatial structure of Therioaphis trifolii population of different periods in Yuanzhou district of Guyuan City,the southern Ningxia Province,was analyzed.The spatial distribution of Therioaphis trifolii population was also simulated by ordinary Kriging interpretation.The results showed that Therioaphis trifolii population of different periods was correlated spatially in the study area.The semivariograms of Therioaphis trifolii could be described by exponential model,indicating an aggregated spatial arrangement.The spatial variance varied from 34.13%-48.77%,and the range varied from 8.751-12.049 km.The degree and direction of aggregation showed that the trend was increased gradually from southwest to northeast.The dynamic change of Therioaphis trifolii population in different periods could be analyzed intuitively on the simulated maps of the spatial distribution from the two aspects of time and space.The occurrence position and degree of Therioaphis trifolii to a state of certain time could be determined easily.