Geographical environment of Yinzhou district

The geotectonic structure of Yinzhou district belongs to the northeast of Fujian-Zhejiang shield, and the strata are mostly Mesozoic volcanic rocks. The southeastern and western parts of the territory are hills and mountains, and the central part is a vast plain. The overall shape is saddle-shaped. The hilly area in the southeast is 375.48 square kilometers, including Taibai Mountain, Fuquan Mountain and Jin 'e Mountain, with Taibai Mountain as the highest and its main peak at an altitude of 656.9 meters. The western hills, covering an area of 353.98 square kilometers, belong to Siming Mountain in the Tiantai Mountain Department of Kuocang Mountain, which spans several counties. From west to east, it is inserted into the west of Yinzhou District, where mountains are stacked, and the highest peak is Naibu Mountain, which is 9 15 meters above sea level. The central part is on both sides of Fenghua River, with a total area of 532.60 square kilometers. It is divided into two parts: the southeast plain and the west plain.

The soil in Yinzhou District can be roughly divided into three categories: there are many saline-alkali soils in the southeast coastal areas, which are suitable for planting cotton; Zhongyuan belongs to paddy soil, which is suitable for planting rice and mat grass. The western mountainous areas are rich in yellow soil and lack of organic matter, so it is suitable to grow tea, bamboo, fruit trees and miscellaneous grains. Yinzhou district belongs to subtropical monsoon humid climate, because it is close to the East China Sea and has maritime climate characteristics. Yinzhou District has four distinct seasons, from March to April in spring, from May to August in summer, from 9-165438+1October in autumn and from 0/2-February in winter, with an average of 7 snows every year. The northwest wind prevails in winter, which is cold and dry, but the sunshine is abundant and the light and temperature complement each other, which is suitable for the growth of overwintering crops. The southeast wind prevails in summer, and the rain and heat are synchronized, which is suitable for the growth of crops such as rice. There was a typhoon at that time, with an average annual typhoon storm 1.8 times. The rainfall in spring and autumn is balanced and the temperature is moderate. The main disastrous weather in Yinzhou District includes typhoon, rainstorm, continuous rain, summer drought, cold wave and frost.

Yinzhou District is located in the low latitude zone, with the maximum solar angle of 765438 0.7℃ and the minimum solar angle of 36.5℃. The annual average sunshine hours are 2070 hours, and the annual average solar radiation is 1 10.2 kcal/cm2. The frost-free period of the year is 238 days. The annual average temperature is 16.2℃, and the historical extreme high temperature is 40.8℃ (August 2003 1 day) and the extreme low temperature is -8.8℃. Average annual precipitation 1538.8 mm, average annual rainy days 174 days, average annual relative humidity of 82.4%, and evaporation of 894.4 mm