Climatic types of rare birds national nature reserve in coastal beaches

The nature reserve is flat, with an altitude of 0 ~ 4m and a mild climate. The annual average temperature is 13.7 ~ 14.6℃, the frost-free period is 2 10 ~ 224 days, the rainfall is 980 ~ 1070mm, and the solar radiation is 165438+. In ancient history, both the Yellow River and the Yangtze River once entered the sea at the north and south ends of the reserve. The Yangtze River and the Yellow River carry a lot of sediment to form the abandoned Yellow River Delta. The northern coast of the reserve is eroded, and the siltation time in the central and southern parts is long. 900 hectares of land are deposited every year in the whole region. The beach is narrow in the north and wide in the south, with a width of 15km. The reserve is the main catchment area of Lixia River, and more than ten rivers flow through the reserve into the sea. Such as Guanhe, Zhongshan River, Biandan Port, Sheyang River, Huangsha Port, Xinyang Port, Doulong Port, Wanggang Port, Zhugang Port, Chuandong Port, Liangduo River and Xingang Port. It is rainy in summer, and after the upper reaches of the river discharge, floods and droughts often occur in beaches in winter. In dry years, the tide level is low, and the beach develops very well due to lack of water.