CN1623935A

CN1623935A - Method for recovering aquatic ecology system of nutrition-enriched water of lake

Info

Publication number: CN1623935A
Application number: CNA2004100656619A
Authority: CN
Inventors: 刘正文; 王春忠; 李宽意
Original assignee: Nanjing Institute of Geography and Limnology of CAS
Current assignee: Nanjing Institute of Geography and Limnology of CAS
Priority date: 2004-11-10
Filing date: 2004-11-10
Publication date: 2005-06-08
Anticipated expiration: 2024-11-10
Also published as: CN1272264C

Abstract

A method for restoring the aquatic ecosystem of nutrient enriched water in lake includes such steps as applying the fish chemical to the water for killing fish, applying oxidizing material after 7-10 days while stirring for 3 days, and sowing the Daci algia or transplanting its plants after 10-15 days.

Description

Repair the method for nutrition-enriched water of lake aquatic ecosystem

Technical field

The present invention relates to the ecological protection of water body in lake, particularly a kind of method of repairing the eutrophication water aquatic ecosystem.

Background technology

China's freshwater lake mostly is shallow water body greatly, and it is not only one of main source of human Freshwater resources, also is to safeguard good ecotope and the important factor that promotes sustainable development.In recent years, because rapid economy development, utilization of resources intensity strengthens, and causes the original ecosystem serious degradation in China lake, and performance characteristic is that water quality deterioration, blue-green alga bloom frequently break out, and lake eutrophication presents fast development trend.At present, lake water quality deterioration, eutrophication have become one of great environmental problem that China lake faces.From integral body, the eutrophic lake of China causes owing to the irrational utilization of people mostly, culture in enclosure is grown and the overdevelopment of big water surface aquaculture has caused careless type lake high-quality aquatic vegetation to disappear as net, the lake self-regulating function is suppressed or loses, lake water quality deterioration, eutrophication aggravation, careless type lake changes to algae type lake.

Summary of the invention

The purpose of this invention is to provide a kind of method of repairing the eutrophication water aquatic ecosystem, by the submerged plant selecting to suit in eutrophication water, to plant and impose correct method for planting to form group's scale, improve water body environment, repair aquatic ecosystem.

Above-mentioned purpose of the present invention is achieved in that the method for repairing the nutrition-enriched water of lake aquatic ecosystem, it is characterized in that the big najas marina of plantation submerged plant in eutrophication water, the plantation main points are as follows: (1) is to the water body drugs used in aquiculture of splashing, make the water body drug level continue 0.5-1 days, keep 3-5g/m ³, kill the water body fish; (2) oxidizing substance of splashing after 7-10 days, water body concentration reaches 0.5-1g/m ³, stir bed mud simultaneously, improve water quality, bottom environment.Continuous three days, once a day; (3) broadcast sowing big najas marina seed or transplant big najas marina plant after 10-15 days.Described drugs used in aquiculture can be chlorinated lime, and its available chlorine content is not less than 26%, and described oxidizing substance can be unslaked lime CaO, and the density of broadcasting sowing of big najas marina seed is 1-2g/m ², the transplanting density of big najas marina plant is 10-15 strain/m ²The water body in lake of the big najas marina of plantation submerged plant should be sealing water body or pond waters in the lake, and the depth of water is 0.5-2.5m, and area 5-10 mu is advisable.

Selecting big najas marina mainly is to consider: than other submerged plants such as water caltrop, black algae, big najas marina is generally 20-40cm because plant is short and small, become the cluster shape to spread growth, speed is fast, well developed root system, and effectively storm resisting attacks in the bigger water body in lake of stormy waves; Big najas marina is the high-quality natural feed of economic fish such as fish crab.

The big plantation difficult point of najas marina from general water body to eutrophication water is: should plant in the different depth of water according to the degree of body eutrophication.This also is the common difficult point of submerged plant in the eutrophication water plantation.Because aquatic plants growth light requirement photograph is level of compensation when photosynthesis of plant is synthetic with consuming the mutually isochronous water depth of expenditure, not regrowth when plant is in level of compensation.Transparency is one of eutrophication level index, belongs to eutrophication (the heavy eutrophication of 0.4-0.73 rice when water transparency is 0.73-1.30 rice; 0.4 the following serious eutrophication of rice).Level of compensation is about 2 times of transparency.As transparency be 0.73 meter then level of compensation be 1.46 meters, waterplant must be lower than 1.46 meters in the depth of water and could grow, so the recovery of big najas marina should be according to the degree of eutrophication in different depth of water place plantations.

Advantage of the present invention and effect: because aquatic vegetation can absorb nutritive salt in the water effectively, set bed mud, clarification water quality, promote the two packing spaces sexual development, the secretory product of high waterplant can suppress the excess growth of lower plant-algae simultaneously, realizes the benign cycle of lake ecosystem.Generally speaking, waterplant is that main primary producer's water quality is better in the lake, and landscape value such as higher fishery and tourism are arranged, and generally not have the feature of pollution and eutrophication water is a large amount of breedings of blue-green algae.As seen, present situation and reason according to China's eutrophication development, recovering and rebuilding aquatic vegetation is to solve the lake eutrophication problem with the self-purification capacity that improves lake self, be the key that realizes the lake resource sustainable use, recovering submerged plant then is one of important step of rebuilding lake aquatic vegetation work.Simultaneously, the high-quality natural feed is provided for fish, shrimp, crab during fish production.Present method is simple and practical, can recover the submerged plant in the water body rapidly, recovers aquatic vegetation, purifies water and the fish pond crab of breeding fish all has realistic meaning for nutrition enriched shallow lake.

Embodiment

1, selects the shallow water body of the relative closure in fish pond or the shallow lake;

2, the chlorinated lime of splashing in water body makes the water body drug level continue to keep in 0.5-1 days 3-5g/m ³, kill the water body fish.Too short as the time, concentration is too low, all can not effectively remove the water body fish, fish can eat big najas marina; The oversize medicine of then wasting increases the drug administration number of times;

3, the unslaked lime of splashing after 7-10 days, concentration reaches 1g/m ³, stir bed mud simultaneously, improve water quality, bottom environment.Continuous three days once a day;

Chlorinated lime and unslaked lime belong to oxidizing substance together.Generally speaking, bed mud is sour environment, contains various organic acids in the mud, in the use energy of chlorinated lime and unslaked lime and acidic substance, kills the water body bacterium, and oxidation of organic compounds improves water transparency, improves water, bottom environment.Certain density bleaching fluid can also effectively be killed the water body fish

4, (density is 1-2g/m to broadcast sowing big najas marina seed after 10-15 days ²) or (density is 10-15 strain/m to transplant plant ²).

Nanjing Inst. of Geography and Lakes, Chinese Academy of Sciences has carried out recovering big najas marina population test on the culture of Chinese mitten crab pool, Yucheng, Shandong test base, 5 mu of test pool areas, and depth of water 0.5-0.7 rice, transparency 0.3-0.4 rice belongs to eutrophication water after testing.After killing water body fish and unslaked lime as stated above and improving water quality, bottom environment, broadcast sowing big najas marina seed March, density is 1-2g/m ², pond waters 70% area is covered by big najas marina after two months, and water quality is so clear that you can see the bottom, and it is zero substantially that indexs such as water nutrition salt nitrogen phosphorus detect.

Claims

1, repair the method for nutrition-enriched water of lake aquatic ecosystem, it is characterized in that the big najas marina of plantation submerged plant in eutrophication water, the plantation main points are as follows:

(1) to the water body drugs used in aquiculture of splashing, make the water body drug level continue 0.5-1 days, keep 3-5g/m ³, kill the water body fish;

(2) oxidizing substance of splashing after 7-10 days, water body concentration reaches 0.5-1g/m ³, stir bed mud simultaneously, improve water quality, bottom environment.Continuous three days, once a day;

(3) broadcast sowing big najas marina seed or transplant big najas marina plant after 10-15 days.

2, according to the described method of claim 1, it is characterized in that described drugs used in aquiculture can be chlorinated lime, its available chlorine content is not less than 26%, and described alkaline matter can be unslaked lime CaO, and the density of broadcasting sowing of big najas marina seed is 1-2g/m ², the transplanting density of big najas marina plant is 10-15 strain/m ²

3, according to claim 1 or 2 described methods, it is characterized in that the water body in lake of planting the big najas marina of submerged plant should be sealing water body or pond waters in the lake, the depth of water is 0.5-2.5m.