Climatic conditions in Luxi town

In climate, the four seasons are divided according to the daily average temperature. The daily average temperature is stable at 10℃ in beginning of spring, 22℃ in long summer, one day after 22℃ in beginning of autumn and one day after 10℃ in beginning of winter. From the perspective of seasons, Luxi Town has a long winter and summer time and a short spring and autumn time. The four seasons begin in the valley plain: spring begins in mid-March and lasts for about 70 days; Summer begins in late May and lasts about 1 10 days. Autumn begins in mid-September and lasts about 80 days. Winter starts from the end of 1 1 to the beginning of March the following year, and the time is about 100 days. In spring, the temperature rises rapidly. Affected by cold air, the weather is sometimes cold and sometimes hot, and even hot and cold, and rainy days are longer. Because the air is humid, this period is called "rainy season". Spring is the season when the earth recovers. The so-called "Spring Breeze and Green Jiang Nanan" trees began to sprout, opened their leaves, changed from light yellow to light green, and finally turned green. All kinds of flowers are in full bloom and colorful, and the earth is like a colorful brocade. At this time, farmers began to work hard for another year, but the "cold spring" weather in early spring is easy to lead to early rice rot, so preventive measures need to be taken in time.

In summer, the high-temperature and high-pressure airflow from the Pacific Ocean blows into the mainland, and the temperature rises gradually. There are many sunny days, and the sunshine time begins to increase. Summer is the season of vigorous growth of plants, but there are many rainstorms, which are prone to floods and threaten local crops.

Enter autumn in mid-September. At this time, the warm air flow gradually weakened and the cold air became active. Affected by cold air, the temperature drops rapidly, which is often "an autumn rain and a cold", and there will be "cold dew wind" weather in the middle and late September. This kind of weather comes too early and has a great influence on late rice. 9. 10 is controlled by high-pressure airflow, and the sky is clear and refreshing, but the rainfall is scarce and the air is dry, which is prone to autumn drought. In some years, cold and warm air often meet in the Yangtze River basin, resulting in continuous autumn rain and "rotten autumn" weather.

1 1 After the middle of the month, strong cold and high pressure gas began to control the ground. Under its influence, winter came. In winter, the weather is cold, it rains and snows, and frost and freezing often occur. Sometimes, due to heavy snow, the mountains are covered with thick snow and white. Trees and Phyllostachys pubescens are upside down and wrapped in silver. Therefore, bamboo forests are often destroyed, causing losses.

The climate in Luxi Town is generally mild and pleasant. The temperature is low in mountainous areas and high in plains. The average temperature over the years is 65438 07℃. January is the coldest, with an average temperature of 5℃. It is the hottest in July, with an average temperature of 28.8℃. The highest temperature in summer reaches 39℃. The lowest temperature in winter is MINUS 4 degrees Celsius.

There is abundant rainfall in western Shandong, and the average rainfall over the years is about1621.8 mm. The rainfall varies greatly in different regions. The distribution trend of rainfall is as follows: more in the south and less in the north, less in the east, more in the mountains and less in the plains. Generally speaking, it decreases from southeast to northwest. Matian, Wanlongshan and Zhangjia Square are rainy areas. The average rainfall in Matian over the years is 1, 832.6 mm, and the average rainfall in some villages bordering Gaokeng is only 1, 455.9 mm, with a difference of 376.7 mm, almost 2 1% less than that in Matian. The rainfall in our town is the highest in May and the lowest in September. The rainfall in the first half of the year is 1 184.0mm, accounting for 73% of the annual rainfall, and the rainfall in the second half of the year is 437.8mm, accounting for 27% of the annual rainfall. April, May and June are the most rainy months, and the total rainfall in three months is about 706.35 mm, accounting for 43.5% of the annual rainfall, commonly known as rainy season. Due to the concentration of rainfall, heavy rain and heavy rain appear one after another, which is prone to flash floods and floods. Autumn and winter are prone to autumn drought due to less rainfall, and summer drought is also once in a few years.

The regional difference of rainfall is mainly due to the influence of topography. Southeast across Wugong Mountain, the mountains are connected, forming a natural barrier. The weather system moves south, the airflow is forced to rise, and it rains when it is cold. Moreover, there are many local thunderstorms in summer, which makes the rainfall in the southeast more than in other areas. Rainfall is not obviously affected by altitude. Changfeng, 544 meters above sea level, has less rainfall than Matian, 355 meters above sea level. Due to a large number of deforestation, soil water storage capacity becomes worse and a large number of soil erosion occurs. Autumn drought is most likely to occur when the rainfall is below 1400 mm in that year or below 200 mm in July, August and September. The length of time the sun shines on the ground is called sunshine. Sunshine is measured in hours. Luxi Valley Plain is open and sunny, with an average annual sunshine of about 158 1 hour. Because there are many hills in the territory, many mountains in the border, great ground barriers and frictions, and low wind power. The northwest is low and flat, with open terrain and large valley basin. Affected by topography and monsoon, there are southeast winds in spring and summer and northwest winds in autumn and winter. The frost-free period in the whole region is long, generally around 270 days. The first frost is generally in the late month of 1 1, and the final frost is generally in the middle of February.

The mild climate, abundant rainfall, abundant sunshine and long frost-free period provide good natural conditions for the growth of crops. Generally speaking, when the average temperature of the day is lower than 5℃, winter crops will stop growing and enter a dormant period; The temperature is stable above 5℃, which is the temperature index for crops to stop closing their eyes and resume growth in winter; Above 10℃ is the temperature index for the growth of warm-loving crops; above 15℃ is the temperature index for the rapid growth of warm-loving crops and early rice transplanting; Above 20℃ is the suitable temperature index for heading, flowering and pollination of rice. The average annual accumulated temperature in the town is 4570℃ ~ 5300℃, which provides sufficient heat for the growth of crops. Farmland in valley plains and hilly areas below 300 meters above sea level is conducive to the development of double cropping rice and triple cropping system of "rice, rice, oil" and "rice, rice and safflower". In hilly areas, due to the suitable climate, fertile land and acidic geology, good conditions have been created for the growth of citrus, tea and camellia oleifera. In Gorkon and low mountainous areas, coniferous forests should be planted as timber forests because of the wet land. The timber forest dominated by Wugong Mountain winds from northeast to southwest along the southeast border. Through experiments, such an environment is very suitable for the growth of Pinus taiwanensis and Pinus elliottii.