First, the location of Chengjiang City.
Chengjiang City is a county-level city directly under the jurisdiction of Yunnan Province, located in the middle of Yunnan Province, bordering Nanpanjiang River in the east, Jiangchuan District and Huaning County in the south, Chenggong District and Jinning District in the west and Yangzonghai in the north.
Chengjiang City is located between 24 29'-24 55' north latitude and 65 438+002 47'-65 438+003 04' east longitude, with a total area of 9 16 square kilometers. By June 5438+00, 2022, Chengjiang had two streets and four towns under its jurisdiction.
Second, the terrain of Chengjiang City.
The southeast of Chengjiang City and the west of the lake are surrounded by mountains on three sides, but there are flat dams in the north, and the buildings are scattered. Dongdahe Reservoir and Liangwang River are divided into two parts: east and west, north and south. Most of the mountains in the territory are north-south, and Luozang Mountain runs through the central part from west to east, forming two dams, Chengjiang and Yang Zong.
The highest elevation is 2820m at the main peak of Liangwangshan Mountain, and the lowest elevation is1328m at the intersection of Nanpanjiang River and Haikou River, and1755m in Zhenhai, Lu Feng City. The mountainous area accounts for 73.4% of the total area, the water area accounts for 18.6%, and the dam area accounts for 8%, forming a natural pattern of "seven mountains, two waters and one dam".
Climatic characteristics and soil types in Chengjiang city;
1, climate characteristics.
Chengjiang belongs to subtropical plateau monsoon climate, with abundant sunshine, warm in winter and cool in summer, more accumulated temperature, distinct wet and dry, and rainy and hot in the same season. Annual average temperature11.9-17.5℃, extreme maximum temperature 33.7℃, extreme minimum temperature -3.9℃. Frost lasts for 46 days at most and 9 days at least, with light frost once every five years and heavy frost once every five years.
The annual rainfall is 900- 1200mm, and the relative humidity is 76%. Southwest wind prevails, with an annual average wind speed of 2.3m/s, the total sunshine hours of the whole year is 2172.3h, and the sunshine rate is 50%. The annual total radiation is 1222 10 calories/cm2.
2. Soil type.
Due to the influence of different parent materials, different climates, different landforms, different vegetation and different utilization modes, the soil in Chengjiang City forms 6 soil types, 10 subcategories, 13 soil genera and 28 soil species.
Red soil accounts for 68. 1% of the land area, acid purple soil accounts for 13.54% of the land area, and the other four types account for 18.36%.