Study On Relationship Of Geographical Landscape With Mosquitoes' Distribution In Rice Growing Area By Remote Sensing

Remote sensing could be used to obtain the data about geography, meteorology, environment in continue and repeated ways; and such data is security, no geographical environment limited, large area covering, and abundance. Because remote sensing could provide plenty message for the epidemiology research, it got widely application in the research of natural focus disease, parasitic disease, and endemic disease after Cline suggested the first time that the remote sensing could be useful in epidemiology study. Lots of study oversea also suggests that study the mosquitoes' distribution with the remote sensing is low cost and more accurate than land survey merely, so it is important to study the relationship of geographical landscapes with mosquitoes' distribution by remote sensing.China is the major rice growing country, rice fields occupy larger part agriculture fields. The rice fields, which reserves static water, are good site for mosquitoes breeding. There are more than forty species mosquitoes have been found in the rice fields of China, these mosquitos' species include: An. anthropophagus and An. sinensis, which are the vectors of malaria and lymph filariasis; the Cx. tritaeniorhynchus, which is the vector of Japanese B Encephalitis, and any other vampire mosquitoes species. Because rice fields' mosquitoes play key role in the epidemiology of mosquito-borne infectious disease, studying on the composing species and distribution of mosquitoes in the rice fields is crucial to control the mosquito-borne infectious disease.The distribution of rice fields' mosquitoes is influenced by the geographical landscape around fields such as: trees species and quantity,irrigation water quality, and distance away from ranch. In this paper, remote sensing is utilized to study the relationship of geographical landscapes and mosquitoes' distribution in rice growing area. Two rice growing areas are taken as the study objects, one is Taihu town in Tongzhou district of Beijing, the other is Yangran town in Sanya city of Hainan province; totally twenty sites from these two areas are selected to sample (thirteen sites in Taihu, seven sites in Yangran ); in each site, the species and density of adult and larva mosquitoes are surveyed with mosquito net and dipper; the GPS is also applied to position these sample sites. At the same time, with ERDAS IMAGE8.5 software help, the aero-remote sensing pictures over these two areas are proceed Geometric Corrected and Image Mosaic; each sample site is taken as center to make circle buffer which radius is one kilometers; geographical landscapes' area and proportion exaction is done on twenty buffer area. In the end, the related analysis on the geographical landscapes to the spices and quantity of mosquitoes is performance by SAS statistic software. Conclusions could be drawn in this paper as followed.In the rice growing fields from Taihu town in Tongzhou district of Beijing: the quantity of An. sinensis is found to be positive relate to the area of rice fields, which means enlarge the rice growing area will result with growing quantity of An. sinensis; the quantity of Cx. tritaeniorhynchus is found to be positive relate to area of rice and trees growing fields, which is result of the rice growing fields is the major breed site for the larva of Cx. tritaeniorhynchus and the trees growing field formats ideal site for the habitat and hidden of adult Cx. tritaeniorhynchus; positive relate is also found between quantity of Cx. Modestus with area of human dwelling and quantity of Cx. pipi ens pal lens with area of sewage channel, trees growing field, and dry land. Results above promote us that we shouldpay more attention to the area of human dwelling, sewage channel, trees growing field in the control of mosquitoes species motioned above.In the rice growing fields from Yangran town in Sanya city of Hainan province: The quantity of Cx. pipiens quinquefasciatus is marked relate with the area of sewage channel and paddy fields especially, which means these two type geographical landscapes could inc...