Water hyacinth is native to Brazil, in 1901 was introduced into China as a flower, in the 1950s and 60s was widely promoted as pig feed in the south of China, water hyacinth has been flooded in 19 provinces in China, the annual treatment of water hyacinth investment is a huge amount of money.
Water hyacinth reproductive ability is extremely strong, once invaded suitable for its growth environment, it will grow in pieces, in the water body nutrient content is high, a single plant can breed to 80 plants a month, these newly grown individuals will continue to reproduce, the number of water hyacinth will rise exponentially, 90 days can breed 600,000 plants. Moreover, the water hyacinth can also drift with the water, its invasiveness is extremely strong, and the water hyacinth is also listed as one of the "world's top ten pest grasses".
<h1 class= "pgc-h-arrow-right" > although water hyacinth has the effect of purifying water quality, its effect on ecology is "more harmful than beneficial"</h1>
Water hyacinth likes fertilizer, the higher the nutrient content of the water layer, the faster its reproduction rate, its root absorption capacity is extremely strong, the nitrogen, phosphorus, potassium and other nutrients in the water body, as well as zinc, lead, nickel, cadmium and other heavy metal elements have a good absorption effect, so the water hyacinth has a significant purification effect on the polluted water body, can be used to purify industrial sewage and domestic sewage, is a good plant to purify water quality and beautify the environment.
Purifying water quality I think must be controlled from the source, otherwise everything is in vain, water hyacinth will have a barbaric blockade of the water body, which will cause disaster to underwater organisms and seriously damage the food chain.
The impact of water hyacinth on the food chain mainly has 2 major points: one is to dissolve the oxygen in the water, after the water hyacinth covers the water surface, it will isolate the water surface from the air, so that the oxygen in the air cannot be dissolved in the water, and at the same time increase the concentration of carbon dioxide in the water body, once the oxygen in the water body is insufficient, it is almost fatal to underwater organisms, which will cause a large number of fish to die; the second is that the water hyacinth will block the sun, and the underwater plants will die because they do not get enough light, due to the large number of deaths of underwater phytoplankton. Aquatic animals will die from lack of food, the food chain will be seriously damaged, and the ecology will be seriously imbalanced.
Taking China's Dianchi Lake as an example, in the 1960s, there were 16 species of main aquatic plants and 68 species of aquatic animals in Dianchi Lake, and after only 20 years, these aquatic organisms have been difficult to trace, and more than half of the fish have been endangered, causing immeasurable losses to the fishery resources of Dianchi Lake.
<h1 class= "pgc-h-arrow-right" > water hyacinths as pig feed, which I think is very undesirable</h1>
Compared with other aquatic plants, the absorption capacity of heavy metals is stronger, the pollutants in the water are absorbed by the water hyacinth, and the water hyacinth is eaten by pigs, pigs are our human food, and finally these heavy metals are absorbed by the human body.
Water hyacinth is only responsible for collecting pollutants, not for the degradation of pollutants, these pollutants are absorbed by the organism almost will not be decomposed with metabolism, will continue to accumulate with the food chain in the organism, generally the more advanced animals accumulate more toxins. Therefore, it is very undesirable to plant water hyacinths in contaminated areas of water, which are then used to feed livestock.
<h1 class="pgc-h-arrow-right" > what measures have we taken to treat the water hyacinth? </h1>
Water hyacinth is a notorious plant, in addition to breaking the ecological balance, water hyacinth will also block the river, will make shipping interrupted, due to poor water circulation, in the water hyacinth rivers are prone to waterlogging, rainy season is easy to cause flooding. In addition, the place where water hyacinth grows is the best breeding place for mosquitoes and flies, and it is also a breeding ground for pathogens, and the risk of human or animal diseases will increase.
Because the water hyacinth slows down the flow of water, and the water hyacinth blocks the sunlight, a large amount of rot will be generated under the water, the water will slowly become odorous, the color of the water body will turn green, and the drinking water resources will be seriously damaged.
The most traditional treatment method for water hyacinth is to use nail rake fishing and slipping net drag. However, this approach is time-consuming and laborious, and the symptoms are not curative, and after a clean-up, it will return to its original state after a month.
In some places, the mechanical churning method is used. This method can quickly open the channel, but the crushed water hyacinth will ferment in the water, which will cause secondary pollution to the water source.
In some places, pesticides are sprayed to kill them. Pesticides have a strong destructive ability to water hyacinth, and do not take time and effort, and can kill a large piece of water hyacinth in a short period of time. However, pesticides cannot completely kill the root system of water hyacinth, and pesticides will cause pollution to water, which will endanger the safety of people, animals and fish.
The natural enemy of the water hyacinth is introduced, the "water hyacinth elephant beetle". This insect is very specific to the food it eats, only eating water hyacinth, and there is no record of this insect harming other plants at home and abroad, which is why there is no water hyacinth flooding in the Amazon basin.
However, after all, the water hyacinth elephant beetle belongs to an alien species, and it is afraid that because of changes in climate or environment, it will cause them to eat other organisms, so China is more cautious about the introduction of elephant beetles, afraid that it will cause new ecological disasters.
Water hyacinth weevil
<h1 class="pgc-h-arrow-right" > is there a more trouble-free and environmentally friendly way to treat water hyacinth? </h1>
Although the water hyacinth reproduces extremely quickly, it also has a fatal weakness, the plant "can not cross the barrier of the fence", so we only need to fence it to stop its spread.
The water hyacinth fenced up can not only prevent the spread of the water hyacinth, but also control the range of activities of the water hyacinth, and the water hyacinth that is enclosed in the water body can also purify the water quality and will not damage the food chain, which can be described as killing two birds with one stone.
Everything in the world has weaknesses, there is a saying in the countryside called "lotus is not a bridge, bamboo is not a ditch", which is the same as the water hyacinth can not cross the physical obstacle is a truth, for the difficult to clean plants, the best thing is to stop it from spreading.
In short, the accumulation of water nutrients is very conducive to the spread of water hyacinth, the general water body is relatively high-quality lakes are difficult to find water hyacinth, so establish environmental awareness, care for the environment in order to fundamentally control the water hyacinth.