What are the important values of rare and endangered plants?

Every rare and endangered plant has its function. If extinct, there will be no such species, its role in the biosphere will disappear, and the original stability and balance of the biosphere will be destroyed. The food chain and food web in the biosphere will change and the stability will decrease. If the structure of food chain and web changes, it will affect the nutritional relationship of organisms in it, and organisms may not have enough food. Plants are the first layer of the food chain. If the number of plants decreases, animals may lose their sources of nutrition, thus threatening their survival. Animals, like plants, are the main source of nutrition for people, so if plants and animals are difficult to survive, it will directly affect people's survival. So the creatures in the biosphere are interdependent and interdependent.

Therefore, the fewer species in the biosphere, the worse the stability of the biosphere, which will affect the survival of human beings and other creatures.

Land Resources Weihai has a total land area of 580,000 hectares (5,799.84 square kilometers). According to the present situation of land use, it is divided into three categories. Among them, agricultural land is 443,600 hectares, accounting for 76.48% of the total area; The construction land is 89,000 hectares, accounting for15.35% of the total area; The unused land is 47,400 hectares, accounting for 8. 17% of the total area. According to the present situation of land use, it is divided into 8 categories. Among them, the cultivated land area is 654.38+093.7 thousand hectares, accounting for 33.39% of the total area; The garden area is 35 1 10,000 hectares, accounting for 6.06% of the total area; Woodland area107900 hectares, accounting for18.60% of the total area; Grassland area 1.55 million hectares, accounting for 2.66% of the total area; The urban and industrial land area is 8 1.5 million hectares, accounting for1.4.05% of the total area; The traffic land area is 26,200 hectares, accounting for 4.51%of the total area; The land area of water area and water conservancy facilities is 59,900 hectares, accounting for10.33% of the total area; Other land covers an area of 60,200 hectares, accounting for 10.40% of the total area.

Water Resources Weihai City is located at the easternmost tip of Shandong Peninsula, and there are no big rivers in the territory. China's water resources mainly come from atmospheric precipitation. The average annual precipitation in the city is 770.6 mm, the runoff depth is 256.0 mm, the surface water resources are 65.438+0.4 billion cubic meters, and the groundwater resources are 56.5438+0.4 billion cubic meters. After deducting the repeated calculation of surface water and groundwater recharge, the average water resources in the city for many years is 65.438+68.6 million cubic meters.

Mineral resources There are 49 kinds of minerals (including sub-minerals, the same below) found in Weihai City, of which 30 kinds have been found or proved, and 23 kinds are listed in the reserve table of Shandong Province, including energy minerals, metal minerals, non-metal minerals and water vapor minerals. Of which 1 energy mineral: geothermal. Metal minerals 1 1: iron, titanium, copper, lead, zinc, molybdenum, gold, silver, beryllium, zirconium and hafnium. 9 kinds of nonmetallic minerals: pyrite, serpentine for fertilizer, graphite, feldspar, glass sand, building sand, kaolin, decorative granite and decorative gabbro. There are two kinds of water and gas minerals: groundwater and natural mineral water.

Biological resources Weihai is rich in marine biological resources, especially in shallow seas and intertidal zones, with a wide variety, wide distribution and large resources. The average biomass of the city's sea area is 353g/m2, and the average biomass density is 586 /m2. There are 779 species of biological resources, including 647 species of animals and 0/32 species of plants. Among the animal resources, there are more than 100 species of fish, including small yellow croaker, Pseudosciaena crocea, yellow croaker and perch. Shrimp and crab mainly include claw shrimp, China prawn, hairy shrimp, white shrimp with ridged tail, Portunus trituberculatus, Japanese tuna and so on. Shellfish mainly include Chlamys farreri, abalone, clam, clam, Philippine clam, clam, oyster, clam and mussel. Coelenterates mainly include jellyfish; Echinoderms mainly include Stichopus japonicus, sea urchins and starfish. Among the plant resources, there are mainly brown algae kelp and Undaria pinnatifida, red algae seaweed and Porphyra yezoensis, and seaweed kelp. ? There are 75 families 195 genera and 5 16 species (including varieties, subspecies and forms) of woody plants in Weihai.

Among them, rare and endangered tree species 19 belong to 23 genera and 29 species, wild tree species belong to 54 families 132 genera and 279 main cultivated tree species belong to 62 families 136 genera. There are 42 species of ancient and famous trees in 22 families and 32 genera, and 9 families 10 genus 17 species of introduced trees. There are 29 rare and endangered tree species, including 6 species of national key protected wild plants: rose, northeast blackcurrant, Actinidia arguta, Actinidia arguta, rattan pear root and Tilia amurensis. There are 1 species of Juglans mandshurica in China. National precious tree species are Quercus mongolica, Sophora japonica and Catalpa japonica. The endemic tree species in Shandong are Carpinus microphylla, Quercus acutissima, Ulmus pumila, Zanthoxylum bungeanum, Vaccinium myrtillus, Begonia trifoliata, Hovenia dulcis, Elaeagnus macrophylla and Aralia elata. ? There are 647 species of animal resources in Weihai. Terrestrial wild mammals include sika deer, fox, leopard cat, badger, weasel, hedgehog, hare and bat. More than 250 species of birds were found, of which migratory birds and travelers accounted for more than 70%, and few stayed birds. There are 7 species of wild animals listed in the national first-class protection, such as sika deer, merganser, golden eagle, black stork, oriental stork, white-headed crane and great bustard, and there are swans, mandarin ducks, gray cranes, goshawks, sparrows and horned cranes in the second class. , yellow-billed egret, black-faced spoonbill, white-fronted goose, grey-backed falcon, kestrel, red-horned owl, common carved owl, eagle owl, long-eared owl 16 species; Other birds, foxes, leopard cats, badgers, weasels, hedgehogs, etc. It is listed as a key protected wild animal in Shandong Province. ?

There are five nature reserves in Weihai (Rongcheng Big Swan National Nature Reserve, Shandong Kunyu Mountain National Nature Reserve, Rongcheng Chengshantou Provincial Nature Reserve, Wendeng Mishanhu Wetland Nature Reserve and Rushanhe Wetland Nature Reserve). There are 5 scenic spots (Liu Gongdao National Scenic Area, Chengshantou National Scenic Area, Shidao Chishan Provincial Scenic Area, Shengshuiguan Provincial Scenic Area and Likoushan Provincial Scenic Area) and 7 wetland parks (Weihai The Five Forts Island Bay National Wetland Park, Rongcheng Bahegang Provincial Wetland Park, Wuzhuhe Provincial Wetland Park in Huancui District, Yang Tinghe Provincial Wetland Park in Huancui District, Rushan Provincial Wetland Park and Qinglong in Wendeng District). There are 8 forest parks above the provincial level (Shuangdao National Forest Park, Weideshan National Forest Park, Chashan National Forest Park, Kongtong National Forest Park, Liu Gongdao National Forest Park, Tianfu Mountain Provincial Forest Park, Zhengqi Mountain Provincial Forest Park and Seaside Provincial Forest Park) and 3 geological parks (Liu Gongdao Provincial Geopark, Rongcheng Chashan Provincial Geopark and Rushan Kongtong Provincial Geopark). ?

There are 345 ancient and famous trees belonging to 22 families, 32 genera and 42 species in the city. Among them, Huancui District 165 strains, Wendeng District 29 strains, Rongcheng City 58 strains, Rushan City 68 strains, Weihai Torch Hi-tech Industrial Development Zone 7 strains, Weihai Economic and Technological Development Zone 9 strains, Weihai Lingang Economic and Technological Development Zone 3 strains and Liu Gongdao 6 strains. There are 44 first-class (more than 500 years old) ancient trees, 54 second-class (300-499) ancient trees, 246 third-class (100-299) ancient trees and famous trees 1 plant. Ancient and famous trees mainly include Ginkgo biloba, Sophora japonica, Pistacia chinensis, persimmon, Pu Shu, Catalpa bungeana and Catalpa bungeana, as well as other tree species (varieties) such as Platycladus orientalis, Salix matsudana, Pterocarya stenoptera, Lagerstroemia indica, Platycladus orientalis, Snow Willow, Pinus tabulaeformis, Camellia sinensis, Zheshu, Chestnut, Sophora japonica, Populus tomentosa, Osmanthus fragrans and tassels.