What is the geographical environment of Wenling City?

Wenling City is located in the south of Taizhou Bay on the southeast coast of Zhejiang Province. The city is bounded by huangyan district and luqiao district in Taizhou City in the north, Yuhuan City in the south, Yueqing City in the west, the sea in the east, southeast and southwest, Dachenyang in the east, Pishanyang in the southeast and Yueqing Bay in the southwest.

Land topography in Wenling is long from east to west, narrow from north to south, 55.5 kilometers long from east to west and 35.9 kilometers wide from north to south, with a total land area of 925.82 kilometers, including 387.3 kilometers in mountainous areas, 490.62 kilometers in plains and 47.9 kilometers in rivers, reservoirs and ponds. It is called the land of fish and rice. The territory is high in the west and low in the east, and gradually inclines from west to east. The west and southwest are mostly undulating hills, which belong to the remnant veins of North Yandang Mountain, with the highest elevation of 733.9 meters. The northern, central and eastern parts are plains with flat terrain and rivers, which are the main components of the Huangwen Plain, with an altitude of 2.5~3.0 meters. The city's coastline is 3 16.9 1 km (including land coastline 147.5 km); The shallow sea area of the 20-meter isobath in the territory is 924.05 kilometers; More than 0/70 islands/kloc-with an area of 14.89 km; Most beaches are muddy shoals in the intertidal zone outside the coastal plain, with an area of 155.39 km, and the beaches are flat.

There are many streams and rivers in Wenling City, with a total length of 1.494km, a total water area of 3 1.06 km, a total volume of 62.539 million cubic meters and a storage capacity of 49 1.63 million cubic meters. At present, there are 3 municipal rivers, 6 county rivers/kloc-0 and 33 important town rivers/kloc-0. The main rivers are Jinqinggang, Nanguan River, Weng 'ao River, Lianshuqiao River, 24 Gonghe River, Liangyun River, Mucheng River, Ruosong River and Daxi River. The main water system is Jinqing water system, and the water system area in Wenling is 693.05 km, accounting for 59. 1% of the total water system area. Secondly, there are several independent water systems in southwest China. The discharge of Jinqing River system is obviously controlled by precipitation, which belongs to rain source river. Rivers in other water systems are intermittent, with short source and rapid flow, and the changes of dry and flood are very different.

Wenling City belongs to the maritime monsoon climate in the middle subtropical zone, with mild climate, distinct four seasons, moderate temperature and humidity, sufficient heat, abundant rainfall, suitable illumination and long frost-free period. The maximum wind direction in the whole year is northeast wind, and the number of windy days is 136 days, among which the strong winds caused by tropical storms and typhoon invasion account for about 80%; The annual average temperature is 17.3℃, and the average frost-free period is 252 days. The annual average sunshine hours are 186 1. 1 hour, the average evaporation is 1270.2 mm, and the average total radiation is 104.8 kcal/cm2. Average annual rainfall 1649.6mm, average precipitation days 169 days. March-June and August-September are two obvious rainy periods throughout the year, and the distribution characteristics of rainfall are consistent with the topographic structure. The northwest is greater than the southeast, and the mountainous area is greater than the plain. The disastrous weather is mainly drought and flood, and it is controlled by subtropical high in summer and autumn, so it is easy to cause drought if it is sunny and hot without rain. The longest drought period in history is 5 months, and the shortest is 1 month. Floods are mainly caused by plum rains and typhoon storms.

Wenling city belongs to the coastal zone on the eastern edge of Zhejiang and Fujian, east of the south section of the second first-order structural composite uplift belt in Xinhua Xia and east of Wenzhou-Ningbo fault. Due to the influence of neotectonic movement, the exposed plains in the west and southwest rose into mountains. The mountainous strata are complex and there are many kinds of rocks, which are mainly composed of lava ejected by late Jurassic volcanoes. The lithology is mainly pyroclastic rocks and pyroclastic sedimentary rocks. The eastern part is a Quaternary subsidence area, which has been invaded many times, forming the Haihe River alluvial plain, and the strata are Quaternary marine sediments and modern river alluvium.

Wenling city has diverse soil types and obvious geographical distribution. There are five soil types, including yellow soil, red soil, fluvo-aquic soil, paddy soil and saline soil, accounting for 0.06%, 48.29%, 2.35%, 43.85% and 5.45% of the total soil area respectively. Yellow soil is distributed at the top of the mountain above 600m above sea level, and more tea and masson pine are planted; Red soil is mainly distributed in low mountains and hills below 600m, mostly in woodland, bamboo garden and sparse woodland dominated by Pinus massoniana; Tidal soil is mainly distributed in river valleys and coastal areas, mostly grain fields and gardens; Paddy soil is distributed in the plain river network area, mainly planting rice, barley and other food crops; Saline soil distributed in the coastal area is banded, and crops with strong salt tolerance such as broad beans and cotton are planted.