河北省黄骅市三个重点蝗区两个时段土壤湿度的遥感提取
Extracting Soil Moisture Using Remote Sensing Techniques in Three Severe Locust Areas in Huanghua County,Heibei Province, Across Two Periods
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摘要: 蝗灾是人类历史上重要的自然灾害之一，影响蝗灾爆发的因素很多，其中土壤湿度是重要的影响因素之一。以位于河北省黄骅市境内的3个重点蝗区——黄灶、杨官庄和藤南大洼为监测样区，利用高时间分辨率MODIS遥感影像数据，分别提取2002年(东亚飞蝗大发生年)秋蝗产卵期到夏蝗孵化期间的土壤湿度信息以及2004年(东亚飞蝗轻为害年)相同时段的土壤湿度信息，发现蝗灾大爆发年份的土壤湿度明显低于轻发生年份，在秋蝗的产卵期(9—10月)和夏蝗的孵化期(3—5月)差异尤为明显。Abstract: Locust plagues are one of the most severe plague problems in human history. Among the many factors influencing locust plagues, soil moisture content plays an important role. Three locations in Huanghua county of Hebei province were used as the study area, a region that has been severely affected by locust plague. Soil moisture content was extracted using MODIS remote sensing images from the time that fall locusts are at oviposition (September-October) to the time that summer locust is at hatching (March-April). The study was conducted in 2002, when the region had been severely suffered by locust plague, and from the same time in 2004, when locust plague was less severe. The study shows that soil moisture content in 2002, a year of locust plague, was lower than that in 2004. The effect was greater in September to October, when fall locusts are at ovipositon and in March to April. when summer locusts are hatching.
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