Abstract:

Objective To explore the relationships between mosquito density and land cover types. Methods Mosquito data in Guangzhou city were extracted from 1^st-30^th September 2014. Land cover types in towns of Guangzhou city were extracted based on geographical information system and remote sensing. The relationships between mosquito density and land cover types were explored based on epidemiological statistical method. The differences of mosquito density among towns were explored. Results Coverage ratios of irrigated croplands, water bodies and closed to open (>15%) grassland or woody vegetation on regularly flooded or waterlogged soil-fresh, brackish or saline water in towns with Breteau index (BI)>20, were 1.4%-35.7%, 0.1%-23.1% and 0-3.4%, respectively. These coverage ratios were higher than those in towns with BI≤5, amounting to 0-0.7%, 0-5.1% and 0, for the coverage types described previously. Compared with land cover types in adjacent towns with BI≤5, coverage ratios of irrigated croplands, water bodies and cropland/vegetation were higher and coverage ratio of rainfed croplands was even higher in towns with BI>20. Conclusion Mosquito density was closely related to irrigated croplands, water bodies and closed to open (>15%) grassland or woody vegetation on regularly flooded or waterlogged soil-Fresh, brackish or saline water.

Key words: Mosquito density, Breteau index, Land cover, Spatial relationship

摘要：

目的 探索蚊虫密度与土地覆盖类型之间的关系。方法 采用广州市2014年9月1-30日期间的蚊虫调查数据,用遥感和地理信息系统技术提取广州市街道的土地覆盖因子;采用流行病学统计分析蚊虫密度与土地覆盖类型之间的关系;比较街道蚊虫密度空间分布差异。结果 布雷图指数(BI)>20的街道水浇地、水体和被水淹没或浸湿植被的覆盖比率取值范围分别为1.4%~35.7%、0.1%~23.1%和0~3.4%,而BI≤5的街道水浇地、水体和被水淹没或浸湿植被的覆盖比率取值范围分别为0~0.7%、0~5.1%和0,总体而言,BI>20的街道水浇地、水体和被水淹没或浸湿植被的覆盖比率要高于BI≤5的街道。与邻近的BI≤5的街道比较,BI>20的街道水浇地、水体、耕地和植被的覆盖比率高,旱地的覆盖比率低。结论 蚊虫密度与水浇地、水体和被水淹没或浸湿植被密切相关。

关键词: 蚊虫密度, 布雷图指数, 土地覆盖, 空间关系