Rice grass is cannibal

Introduction: Fujian is the province with the longest coastline in China, which is called "blue treasure house" due to its developed aquaculture industry Since the 1960s, Fujian began to introduce rice grass from abroad for the consideration of wave protection and beach protection, which was popularized in the 1980s However, the rice grass, which grows arbitrarily, has now occupied about 2 / 3 of the beaches in Fujian Province, greatly damaging the ecological environment Because no effective method of "exterminating" has been found, the harmfulness of rice grass is expanding In the coastal area of Ningde, local people talk about the change of grass color and call rice grass "cannibalism" The beach in this area is nearly 870 kilometers long, and it used to have excellent coastal living environment However, at present, 3 / 4 of the beach is occupied by rice grass, so aquatic products and other plants can not stand on it, and people's life is also threatened Especially when fishermen pick up seafood by "digging the small sea" on the beach, once the tide comes, it is difficult to identify the direction when they are trapped in the vast rice grass, and even lead to the tragedy of death It is understood that the rice grass is the general name of several plants of the genus Oryza in Gramineae Fujian was first introduced from the United States Unexpectedly, the rice grass has a very strong reproductive capacity The grass seeds drift with the tide, see the soil take root, and the root system is extremely developed It propagates and spreads naturally at a rate of five or six times every year The rice grass grows wildly, which not only encroaches on the growth space of coastal beach plants, causes the disappearance of large mangroves, but also causes suffocation and death of shellfish, crabs, algae, fish and other organisms, and competes for nutrition with kelp, laver and other organisms Aquaculture is devastated In Ningde area alone, the annual income of farmers has been reduced by hundreds of millions of yuan In addition, the rice grass also affects the exchange capacity of sea water, leading to the decline of water quality and the induction of red tide; blocking the channel and affecting the departure of various ships In order to eradicate the rice grass, the local people tried all kinds of methods: burning, cutting and killing, but all failed Since 1996, Ningde district has offered a reward of 200000 yuan to seek a good way of weeding at home and abroad Experts pointed out that the main reasons for the successful invasion of these alien species are the lack of national awareness of ecological security, the lack of comprehensive interest and risk assessment system, etc Once the invasion of alien organisms is successful, it is very difficult to completely eradicate them, and the cost of controlling the spread is very high According to the statistics of the State Environmental Protection Administration, the economic losses caused by several major invasive species in China reached 57.4 billion yuan last year However, while the introducers in Fujian are repentant, some places are still introducing rice grass in recent years For example, in order to "protect the biological diversity of the Yangtze River into the sea and its migration", some cities have introduced a large area of rice grass It is understood that at present, rice grass has spread to more than 100 counties and cities in the South and north of China, and coastal ecological security is being seriously threatened 2WK