Geographical conditions of Changchun Jingyue Economic Development Zone

The geographical coordinates of Jingyuetan are 125 degrees east longitude and 2 1 minute north latitude. The specific boundaries are Shibeiling in the north, Majialing in the south, Gandashan-Taijiatun Reservoir-Changshuang Highway in the west, Shibeiling-Qianluoquan North-Shuangyang boundary in the east. Its scope includes Jingyuetan Experimental Forest Farm, Jingyuetan Second Forest Farm and Jingyuetan Reservoir. According to administrative divisions, it spans Shengli Village, Nonglin Village, Liming Village, Dongsheng Village, Tanxi Village, Jingyue Sub-district Office, Fengchan Village, Xianfeng Village and Jingyuetan Village in Yutan Town. Jingyuetan area is located in the transition zone from Changbai Mountain in the east of Jilin Province to Horqin Grassland in the west, belonging to the remnant vein of Dabulake Mountain, with an altitude of 220 ~ 406.5 meters and hills 1 19. The basic landform type is water flow type, including erosion and denudation landforms of high hills and low hills, erosion and accumulation landforms of hills and flood plains, and accumulation landforms of valley terraces and flood plains.

The oldest strata in the area are Permian, distributed in the water surface area of Jingyuetan, and are layered altered tuff and slate. The soil is mainly dark brown soil, albic soil dark brown soil, albic soil and meadow soil formed by transitional landforms, and the soil fertility is not high, and the thickness of the soil layer is generally 15 ~ 20cm. The PH value is between 6.2 and 7.2. The climate in this area belongs to the semi-dry and semi-humid monsoon climate zone in the middle temperate zone of Eurasia, with an annual average temperature of 4.7℃, an annual accumulated temperature of 2 950℃ above 10℃, an average maximum temperature of 28.3℃, an average minimum temperature of -22.4℃, an absolute maximum temperature of 38.8℃ and an absolute minimum temperature of -34.9℃. The average relative humidity is 69%; The annual precipitation is about 600 mm, and the rainy season is concentrated in June, July and August, accounting for about two-thirds of the annual precipitation; The evaporation capacity is 65438 0.390 mm; The first snow day mostly appears in the middle of 10, and the last snow day is in the middle of April, with a snow depth of about 20 cm. The first frost usually appears at the end of September, and the final frost appears at the end of April, and the frost-free period is about 145 days. The maximum frozen soil depth over the years is169 cm; The water surface froze around165438+1October 20th, and thawed in mid-April, with an ice age of about 5 months.

The main climatic characteristics are frequent cyclone activities in spring, southerly winds in many places, alternating cold and warm, and rapid temperature rise; There are many showers in summer, few hot days, large temperature difference between day and night, and cooler at night; Autumn is short, which can be described as crisp in autumn; Winter is long, Dorsey is northerly and the weather is cold.