基于地理信息系统的耕地苜蓿斑蚜种群发生的适宜生境

基于地理信息系统（GIS）技术，将宁夏固原市原州区不同时期耕地苜蓿斑蚜种群分布插值图与生态气候图、数字高程图进行叠加，分析了苜蓿斑蚜密度与生态环境和地理分布之间的关系.结果表明：研究区苜蓿斑蚜的分布和发生程度与气候、地貌和海拔密切相关，苜蓿斑蚜在研究区的适宜生境为海拔1440～2000 m的半干旱平原区和半干旱丘陵区，最易暴发成灾的区域为海拔1600～1800 m的半干旱平原区.苜蓿斑蚜的适宜生境与不同时期的空间分布插值图相结合，可定量分析各生态区苜蓿斑蚜种群的空间动态.

Suitable habitat of Therioaphis trifolii population on arable lands of Southern Ningxia based on GIS

Based on GIS techniques, the interpolation maps of Therioaphis trifolii popu
lation on the arable lands in Yuanzhou District of Guyuan City in differen
t periods were overlapped with the ecological regionalization map and digital al
titude map, aimed to analyze the relations of T. trifolii population density
 with its ecological environment and geographical distribution. In the study are
a, the occurrence and distribution of T. trifolii had close relations with c
limate, geomorphology, and altitude. The suitable habitat of T. trifolii in
the District was located in the semi-arid plain area and semi-arid holly area
at the altitude 1440〖KG-*2〗-〖KG-*7〗2000 m, while the most possible occurrenc
e area was the semi-arid plain at the altitude 1600〖KG-*2〗-〖KG-*7〗1800 m. B
y combining the suitable habitat with the interpolation maps of T. trifolii
population in different periods, the spatial dynamics of T. trifolii populati
on in variety of ecological areas could be analyzed quantitatively.