Location context
Hefei
Hefei is located in the middle of the lower reaches of the Yangtze River, in the middle of Anhui Province. It is a national regional central city (East China), a node city where the "Belt and Road" strategy meets the Yangtze River Economic Belt strategy, and a core city of Hefei-Wuhu-Bengbu metropolitan area. Geographical coordinates are 32 86' north latitude and117 28' east longitude. Total area 1 1445.5438+0 km2 (including water area). By the end of 20 15, the built-up area of Hefei is 403 square kilometers.
topography
Hefei has three landforms: hills, low hills and low plains, mainly hills, and the Jianghuai watershed runs through the whole territory from west to east. The elevation of the whole city is mostly between15 and 80m, with an average elevation of 20-40m. The terrain of the main city is inclined from northwest to southeast, and the hills are undulating; Southwest belongs to Dabie Mountain. The highest altitude is 595 meters, located in Niuwangzhai in the west.
Climatic characteristics
Hefei is located in the mid-latitude zone and belongs to the subtropical monsoon humid climate, with obvious monsoon, distinct four seasons, mild climate and moderate rainfall. The annual average temperature is 15.7℃, the annual average precipitation is about 1000 mm, the annual sunshine time is about 2000 hours, the annual average frost-free period is 228 days, and the average relative humidity is 77%.
Hydrological characteristics
The total natural water in Hefei is 3.863 billion cubic meters. The surface water system is relatively developed, with the Jianghuai watershed as the boundary, the Huaihe River system in the north of Lingling and the Yangtze River system in Lingnan. The Huaihe River system mainly includes Dongfeihe River, Hepei River and Chihe River, while the Yangtze River system mainly includes Nanfeihe River, Paihe River, Fengle River, Hangbu River, Chuhe River, Yuxi River, Zhaohe River, Gaozhe River, Baishi Tianhe River and Xihe River. Chaohu Lake is one of the five largest freshwater lakes in China. It is 54.5 kilometers long from east to west and 2 1 km wide from north to south, with a water area of 770 square kilometers. It is called "800 Li Chaohu Lake", and the bottom of the lake is 5 meters above sea level. The amount of water varies with the height of water level. When the water level reaches14m, the water storage capacity is 6.37 billion cubic meters.
Lycium barbarum likes cold climate and has strong cold tolerance. When the temperature is stable at about 7℃, seeds can germinate and seedlings can resist the low temperature of -3℃.
When the temperature is above 6℃ in spring, spring buds begin to sprout. Lycium barbarum overwinters at -25℃ without freezing injury. Lycium barbarum has developed root system and strong drought resistance, and can still grow in arid desert. In order to obtain high yield in production, it is still necessary to ensure water supply, especially in the flower and fruit period. The low-lying land with long-term water accumulation is not conducive to the growth of Lycium barbarum, and even causes root rot or death.
With sufficient light, the branches of Lycium barbarum grow healthily, with many flowers and fruits, large fruit grains, high yield and good quality. Lycium barbarum mostly grows in alkaline soil and sandy loam, which is most suitable for cultivation in deep and fertile loam.
ecological distribution
Lycium barbarum: distributed in Northeast China, Hebei, Shanxi, Shaanxi, South Gansu and Southwest China, Central China, South China and East China provinces; North Korea, Japan and Europe all breed or escape into the wild. Often born in hillside, wasteland, hilly land, saline-alkali land, roadside and village house. In China, it is not only widely wild, but also cultivated for medicine, vegetables or greening.
Ningxia Lycium barbarum: It evolved from the wild Lycium barbarum in northwest China, and the existing cultivated varieties can still be wild under suitable conditions. The early medicinal Lycium barbarum in China is the product of wild Lycium barbarum collected from northwest China, which has been recorded in medical books in Qin and Han Dynasties. Sun Simiao, a famous medical scientist in the early Tang Dynasty, said in "A Thousand Daughters' Wings": Lycium barbarum is "the truth of Ganzhou (now Zhangye, Gansu), and its leaves are thick. Shen Kuo, a scientist in the Northern Song Dynasty, recorded in Meng Qian Bi Tan: "Lycium barbarum, born at the extreme edge of Shaanxi Province, is taller and sweeter than others. "
Some other species of Lycium are often called Lycium barbarum in the local area, such as local Lycium barbarum or Lycium barbarum. Because of their narrow distribution range, they are not easy to see, so more are China Lycium barbarum or Ningxia Lycium barbarum. And according to the distribution characteristics of the two kinds of Lycium barbarum, we can also make a simple judgment, that is, if it is found in the eastern, central and southern regions of China, it is basically China Lycium barbarum or its varieties, and if it is found in the northwest region, it is basically Ningxia Lycium barbarum or its varieties.
Lycium barbarum can be planted in Hefei, Anhui. Lycium barbarum likes cold climate and has strong cold tolerance. When the temperature is stable at about 7℃, seeds can germinate and seedlings can resist the low temperature of -3℃. It has a wide adaptation area and can grow well in Hefei, Anhui. Therefore, Lycium barbarum can be planted in Hefei, Anhui.