1979～1982年在内蒙古自治区通过病人、人群利什曼素皮内试验和白蛉分布等项调查,对该区黑热病疫区和非疫区的景观特征进行比较后指出,黑热病仅在胡杨和红柳生长的荒漠林土(林灌草甸土)地带内流行,只有在这种景观地带才有硕大白蛉吴氏亚种的分布并为优势种,认为荒漠林土地带有黑热病流行的重要原因,同这种土壤适合本区硕大白蛉吴氏亚种的孳生繁殖有关。 From 1979 to 1982 in Inner Mongolia Autonomous Region through the patient, the crowd Leishman skin intradermal test and the distribution of white flushing, black kills area and the non-epidemic area of ​​the area landscape characteristics were compared, pointed out that kala-azar and Populus euphratica The growth of desert forest soil (forest irrigated meadow soil) within the strip, and only in this landscape there is only a large whitefly Wu subfamily distribution and the dominant species that the desert forest land with an important reason for the epidemic of kala-azar, This soil is suitable for breeding giant whitefly Wu subfamily breeding.