Characteristics of Zhoushan

1. Topographic characteristics

The geological structure of Zhoushan city is complex. Most of the strata are covered by Mesozoic Jurassic and Cretaceous volcanic-sedimentary rocks, with occasional outcrops of the Upper Paleozoic metamorphic rock series, and the Cenozoic Quaternary series distributed on the edges of the islands. Thick Mesozoic volcanic rocks are widely distributed in the territory, including three categories: volcanic rocks, intrusive rocks, and metamorphic rocks. The islands are arranged in a southwest-northeast direction, and the terrain slopes from southwest to northeast. The southern islands are large, high in altitude, and densely arranged; the northern islands are small, low-lying, and sparsely distributed. The island has undulating hills, with high hills accounting for 9%, low hills accounting for 61%, and plains 30%, forming different soil types and agricultural utilization patterns. Duzhi Mountain on Taohua Island is the highest peak, with an altitude of 544 meters. Most of the island's peaks are below 200 meters above sea level, and the terrain difference in the southern half is 400 meters. The total length of the coastline is 2,444 kilometers, including 1,855 kilometers of bedrock coast, 530 kilometers of artificial coast (seawall), 50 kilometers of gravel coast, and 13 kilometers of mud coast (coated). There are 200.7 kilometers of shoreline above a water depth of 15 meters, and 103.7 kilometers of shoreline above a water depth of 20 meters.

2. Climate characteristics

Zhoushan Islands is surrounded by the sea and has a subtropical monsoon climate, with warm winters and cool summers, mild and humid, and sufficient sunlight. The annual average temperature is around 16°C. The hottest month, August, has an average temperature of 25.8-28.0°C; the coldest month, January, has an average temperature of 5.2-5.9°C. The annual precipitation is 927~1620 mm. The average annual sunshine is 1941 to 2257 hours, the total solar radiation is 4126×10? to 4598×10? Joules/square meter, and the frost-free period is 251 to 303 days. It is suitable for the reproduction and growth of various biological communities and provides considerable resources for fishery and agricultural production. favorable conditions. The air has strong natural purification ability and small temperature difference changes. Due to the instability of the monsoon, it is vulnerable to tropical storms (typhoons) in summer and autumn. It is windy in winter and drought occurs in July and August. These are common disastrous weather conditions in Zhoushan.

3. Characteristics of natural resources

The vegetation in Zhoushan City belongs to the northern sub-zone of China's mid-subtropical evergreen broad-leaved forest. In the vegetation division of Zhejiang Province, it belongs to the mountainous island vegetation of Tiantai Mountain and Kuocang Mountain. piece. As the terrain changes from low to high and the soil quality changes, mud vegetation, sand vegetation, rock vegetation, and mountain vegetation are formed. There are 544 species of woody plants in the territory, belonging to 89 families, and 63 species of ancient and famous trees. There are 18 main species of mammals, classified into 6 orders and 10 families; there are 164 main species of birds, classified into 17 orders and 40 families, among which the white stork is a national first-level protected wild animal; there are 8 main species of amphibians, classified into 5 families. Family, mostly frogs, occasionally mountain stream salamanders, etc.; there are 24 main species of reptiles, divided into 8 families; there are 26 main species of freshwater fish, divided into 4 orders and 9 families.