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1演变规律及成因利津县位于山东省东北部,黄河入海口西侧。利津县蝗区用GPS实测得面积为1.08万hm2。分为利津1、2号两个小蝗区。从蝗区类型上区分,均隶属典型的沿海蝗区。但这两个蝗区由于其自身的顺序演变,又具备了内涝型的次级结构。1号蝗区面积6 235 hm2,是本县重点蝗区,也是历史性老蝗区。该蝗区蝗虫发生密度大、大发生次数频繁,蝗虫适生面积5 600 hm2左右。
1 evolution and causes Lijin County is located in northeastern Shandong Province, west of the Yellow River estuary. Lijin County locust area measured by GPS area of 10,800 hm2. Divided into Lijin two small locust area. Distinction from the type of locust area, are under the typical coastal locust area. However, due to their own order, the two locust areas evolved and possessed the secondary structure of waterlogging type. No. 1 locust area of 6 235 hm2, is the county’s key locust area, is also a historic locust area. The locust area locust density, frequency of occurrence of large, locust suitable area of about 5 600 hm2.