关键词: 蚊虫密度, 布雷图指数, 土地覆盖, 空间关系

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