algal bloom

Water flower

This data is reviewed by the project of data compilation and application of Science Encyclopedia of science popularization in China.

Water bloom is also called algal bloom. It refers to the phenomenon of over growth of some cyanobacteria in fresh water. The main dominant species are Skeletonema, Microcystis, Anabaena, Chlorella or Cryptococcus. In rural areas, it is the green pond that can be seen. People usually feed ducks. The abnormal proliferation of plankton in rivers, lakes, ponds and other freshwater areas is called water spray.

brief introduction

Photosynthetic cyanobacteria grow in water, only need a very small amount of oxygen, but need a lot of carbon dioxide. When the conditions are suitable, photosynthetic cyanobacteria will multiply rapidly, so that the number of bacteria will increase greatly, and form a green blanket on the water surface. This phenomenon is called algal bloom. Because the water pollution makes the still water eutrophication, which is one of the causes of water spray, the discharged wastewater must be treated strictly. Do not overuse pesticides, pesticides are generally some nitrogen, phosphorus fertilizer, promote the use of phosphorus free detergent is also out of this consideration. At the same time, for the use of lake water and reservoir water as water source facilities, attention should be paid to prevent the filter from blocking, so as not to cause the water quality to stink.

harm

When a large number of water blooms occur, a thick green algae layer is formed on the water surface, which can release the toxin indigo, which is toxic to fish. After death, corruption and decomposition of algae, a large amount of dissolved oxygen in water is consumed, resulting in stench in water body, which not only damages aquatic resources, but also affects water aesthetics and recreation. It is mainly caused by too much biological nutrients such as nitrogen and phosphorus. Some industrial wastewater, domestic sewage and farmland chemical fertilizer can cause algae bloom when they are lost into human water. Algal bloom indicates eutrophication of water body, and measures should be taken to control it.

algae

Algae generally refer to plants growing in water, including some aquatic higher plants. Algae are a large group of cryptophytes, which have no differences in roots, stems, leaves and other parts. They have chlorophyll and can make their own nutrients. There are many kinds of algae, both in seawater and fresh water, and very few of them can live in wet places on land. Seaweed. Chlorella. Algae. It also refers to gorgeous literary color and diction: Zaosi (colorful literary thought). Caili. Painting (literary grace). Caisson (a color painting on the ceiling of a traditional Chinese building). Algae mirror (refers to the evaluation and identification. Also known as "Zaojian"). Words. Alginate decoration. Jade algae is a colorful silk rope tied to the crown of ancient emperors.

red tide

Red tide is a phenomenon that some tiny phytoplankton, protozoa or bacteria in water body suddenly proliferate and gather under certain environmental conditions, causing water body discoloration in a certain range for a period of time. Due to the number and species of red tide organisms, the color of the water body is red, yellow, green and brown. Although red tide has existed since ancient times, with the rapid development of industrial and agricultural production, water pollution is becoming more and more serious. red tide, also known as red tide, is also known internationally as "harmful algae" or "red ghost". It is a kind of harmful ecological phenomenon that some phytoplankton, protozoa or bacteria in seawater proliferate explosively or gather highly under specific environmental conditions, causing water discoloration. Red tide is not always red. It mainly includes bloom in freshwater system, general red tide in ocean, new definition Brown tide (Chlorella), green tide (Enteromorpha), etc. "Red tide" is an abnormal phenomenon in marine ecosystem. It is caused by the explosive proliferation of red tide algae in the algae family under specific environmental conditions. Seaweed is a huge family. Apart from some macroalgae, many are very small plants, some are single celled organisms. According to the species and quantity of the organisms causing the red tide, the sea water sometimes appears yellow, green, brown and other different colors.