Zhang Jiaxiang is a hilly region with parallel fold belts in the east. The territory is hilly, with low terrain in the west and high terrain in the east. The main river in the area is Dongjiang River in the Yangtze River basin, and the rivers in the township and their tributaries flow out of the township. Geologically, it is located in the eastern Sichuan platform area, and its basement is pre-Sinian shallow metamorphic sandstone, slate, carbonate rock and volcanic rock. The caprock above the base is metamorphic Sinian to Quaternary strata with a total thickness of 8000- 12000m. Jurassic strata in Mesozoic are the most widely distributed, followed by Triassic strata in Mesozoic and Quaternary strata in Cenozoic. Zhangjiaxiang is located in Dongping Mountain area of Sichuan Basin, the hilly area in the middle of the basin and the connecting zone of low mountain areas around the basin. According to the observation of Seismological Bureau of the province 10, the whole township is a disaster-free earthquake area, and the possibility of strong earthquakes is very small. The whole town is surrounded by mountains and rivers, with fresh and beautiful natural environment and unique living environment.
2. Climate
Zhangjiaxiang is located in the north temperate zone, which belongs to the subtropical monsoon climate zone. It has the characteristics of mild climate, distinct seasons, abundant rainfall, abundant sunshine, early spring, changeable temperature and rainy autumn and winter. The annual average temperature in this area is 65438 06.6℃, and the vertical change of temperature is obvious. The annual average temperature in mountainous areas is only 13- 14℃, which is about 65430 lower than that in the dam area. The average sunshine hours for many years are 65,438+0,329.2 hours, and there is abundant rain in the area. The annual precipitation is 65,438+0,654,38+0,200mm, and the relative humidity is about 84%. The annual sunshine hours can reach more than 1300 hours, and the sunshine is sufficient.
3. Hydrology
The rivers flowing through Zhang Jiaxiang are mainly Donghe River and its tributaries, with a water area of 26,354 square meters. The water quality of rivers leaving the countryside is poor, the water flow is stable, the water quantity is average, and it is easy to take water and convenient to use water. The river beach and convex beach alternate with each other, with few dangerous beaches and dams, and terraces on both sides of the river extend intermittently.
4. Land
The soil in Zhangjiaxiang is an engineering geological subregion parallel to mountains and valleys. There are 65,438+00 soil genera and 22 soil species in the township. The soil along the mountain is mainly gray-brown purple millet, big soil and old alluvial yellow paddy soil, while the rest of the plain land is sandy loam with large sand content, loose soil and large porosity. The average content of soil organic matter is 65438 0.44%, which belongs to the middle and lower level. The average total phosphorus content in soil is 0.9%, which belongs to the middle and low level. The soil pH is mainly neutral, followed by slight acidity, and the acidity and alkalinity are very small.
5. Animals and plants
Zhang Jiaxiang is located in the subtropical monsoon climate zone, with mild climate, four distinct seasons, abundant rainfall and sunshine, early spring, changeable temperature and rainy autumn and winter, which is suitable for the growth of various animals and plants. Zhangjiaxiang is rich in plant resources, and the natural plants mainly include Coriaria, Vitex negundo, Madong, Quercus variabilis, Rhododendron, Cunninghamia lanceolata and pine. The economic trees planted artificially mainly include tung, pear, persimmon, orange, orange, peach, plum and apricot. Economic plants mainly include rape, peanuts, peppers and so on. Wild fungi are also famous plant resources. At present, the vegetation is mostly garden and woodland, and the woodland is mainly natural forest and a small amount of secondary forest. Due to the influence of human production and life, there are only birds, amphibians, insects, fish and other wild animals in the township, and there are no large mammals.
6. Mineral resources
According to the analysis of geological exploration data, the valuable and exploitable mineral resources in Zhang Jiaxiang mainly include natural gas, coal, iron ore, limestone and bluestone.
7. Land resources
Zhang Jiaxiang has a total of 35,250 mu of land resources (excluding roads and waters), including 7 1 mu and 4 1 mu of cultivated land, with a per capita cultivated land area of 0.86 mu.