Qilihai resources

Qilihai is rich in natural resources. It is a rare "land of feng shui". Because of its low terrain, perennial water accumulation and reeds everywhere, it is the largest reed producing area in Tianjin and a famous rice base in China. Qilihai is an important aquatic product base in Tianjin, with vast waters, excellent water quality, lush reeds and rich natural bait, which is very suitable for the growth of fish, shrimp and crabs. Plant resources include submerged plants such as reed, cattail, Polygonum hydropiper and algae, which are called "hard-core crops". Aquatic resources include grass, carp, snakehead, crucian carp, eel, loach and more than 20 kinds of freshwater and aquatic fish. Shrimp, crab and shellfish such as river crabs have always enjoyed the reputation of "whitebait and purple crab". Bird resources include wild geese, ducks, geese, storks, herons, warblers and other waterfowl and wading birds. Mammalian resources include foxes, raccoons, badgers, rabbits and other mammals. In 1950s and 1960s, the natural catch of aquatic products in Qilihai reached more than 5 million Jin per year. The annual output of reed and cattail reaches more than 50 million Jin.

Qilihai Lake is a reed swamp, and the plants in the whole sea are mainly reed communities. In the low-lying areas of the sea, there are large areas of emergent plants, such as Typha community, Allium fistulosum community, Trigonum community, Polygonum hydropiper community and so on. In the water depth of more than 40 cm, submerged plant communities such as algae and shepherd's purse grow. But in the process of plant community succession, reeds gradually replaced other plants.

Phragmites communis, Typha Typha, Sparganum burmannii and other emergent plants all belong to tufted rhizomatous herbs, all of which have special asexual reproduction ability and strong tillering ability. Because they grow in an environment with too much water or too wet soil, it is difficult to reproduce by seeds, mainly by rhizomes. Therefore, their rhizomes are thick and thick, and their proliferation ability is very strong. For example, the rhizome of reed is generally 1-2 cm, and the thickest can reach 4 cm. Reed is a widely distributed plant with strong adaptability to the environment. Under the combined action of sufficient heat and water conditions, the reeds in Qilihai grow well, with tall plants, thick stems and dense growth, forming a green reed forest and reed sea. It covers 70-80% of the area. Standing on a high place and looking out, I saw the community clean and lush, the breeze blowing and the green waves rolling, just like the blue waves on the sea.

The watery and humid natural environment in Qilihai makes plants have unique ecological characteristics and physiological structure, forming wetland vegetation. However, due to the limitation of natural conditions, the mammal population is relatively poor, with only a lot of fish, crabs and birds, because the swamp environment with overgrown water plants provides them with rich food sources and good conditions for nesting, avoiding enemies and inhabiting. So as to form various aquatic and wading bird communities. Among them, there are more than 0/0 species of resident birds living in Qilihai all the year round, more than 0/0 species of national first-class protected birds such as storks, golden eagles, white-shouldered eagles and jade-belt sea eagles, and more than 20 species of second-class protected birds such as swans, seagulls, cranes and owls. Red-crowned crane and swan were once extinct in the past. In recent years, due to the improvement of the ecological environment, they moved to Qilihai in droves every year. In addition, there are a large number of common birds, such as geese, wild ducks, osprey, egrets, and "Zamag".