A biomanipulation method for lake ecosystems to promote the stability of submerged plant communities

A technology for submerged plants and ecosystems, applied in the field of biomanipulation of lake ecosystems to promote the stability of submerged plant communities, can solve problems such as ecological restoration failure, water quality deterioration, and unavoidable problems, to improve water quality, promote expansion and recovery, low cost effect

Active Publication Date: 2020-10-30
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because submerged plants inevitably brought sticky eggs of carp and crucian carp into the plants when they were transplanted, or juvenile carp and crucian carp carried in during the water replenishment period, a large number of carp and crucian carp juveniles broke out after the ecological restoration construction was completed, and the water quality deteriorated. The transparency is greatly reduced, which inhibits the growth and population expansion of submerged plants, leading to the final failure of ecological restoration

Method used

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  • A biomanipulation method for lake ecosystems to promote the stability of submerged plant communities
  • A biomanipulation method for lake ecosystems to promote the stability of submerged plant communities
  • A biomanipulation method for lake ecosystems to promote the stability of submerged plant communities

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Embodiment 1

[0034] The outdoor controlled experiment was carried out at the Taihu Lake Ecosystem Research Station of the Chinese Academy of Sciences for a period of 30 days. The density of crucian carp was the only influencing factor in the experiment. There were a total of 12 experimental barrels in the experiment. Before the experiment, 10 cm thick sediment was added to the barrel. The sediment came from Taihu Lake and was used after removing impurities and mixing. The submerged plants used in the experiment were two kinds of bitter grass and black algae. The seedlings of bitter grass and black algae with the same body shape and height were selected and cultivated for one week, and then planted in the experimental bucket. 12 plants of bitter grass (40g) and black algae were planted at even intervals in each bucket. Algae (12g), the experimental barrel was injected with filtered Taihu Lake water, and the crucian carp was put in after the overlying water of the experiment was clarified and...

Embodiment 2

[0039]Taizhou Qinhu Lake ecological restoration demonstration water area, the demonstration project area is 80,000 square meters, construction began in May 2011, the main ecological restoration measures are planting submerged plants and removing benthic fish, and the ecological restoration construction was completed in June. From May to October, the first anniversary of the completion of ecological restoration construction, investigate the coverage of submerged plants in Qinhu Lake and the number of dominant species of submerged plants. During the period, fish were caught at the sampling point, and the species identification and weight determination of the caught fish were carried out. There were two sampling points, one of which was set when the biomass of the submerged plants exceeded 500 g / m 2 In the area, another sampling point is set where the biomass of submerged plants is lower than 50 g / m 2 In the area, the species identification and weight determination of the fish ca...

Embodiment 3

[0044] The ecological restoration demonstration project of Wuli Lake in Wuxi, with an area of ​​50,000 square meters, started construction in May 2010. In July, the water body was turbid, with a transparency of 45cm. At that time, the coverage of submerged plants was less than 40%, and there were 2 dominant species, while the biomass of carp and crucian fish reached 8g / m 3 , carry out carp crucian carp reduction to 3g / m 3 . Immediately, bottom dwelling fish reduction was implemented, and 90% of the catches were carp and crucian carp (about 60% of which was crucian carp). After 12 days after the end of the fish reduction, the transparency of the water body improved to more than 90 cm, and the water quality was good.

[0045] In May of the second year, the observation found that the coverage of submerged plants was 50%, the dominant species were 3 species, and the biomass of carp and crucian fish was 7g / m 3 , the transparency is 70cm, and then the carp and crucian carp are cut...

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Abstract

The invention provides a biomanipulation method capable of promoting stability of submerged plant communities for a lake ecosystem. The scheme comprises the following steps: setting stages of an ecological restoration period; determining growth conditions of submerged plants; measuring biomass of bottom-living fish; reducing the bottom-living fish. According to the method, the bottom-living fish in the ecological restoration project is reduced effectively according to practical restoration situation of the lake ecosystem, so that quality of the eutrophic water body is improved and repaired, expansion and restoration of the submerged plant communities are promoted, and the method has the characteristics of being safe, low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a lake ecosystem biological manipulation method for promoting the stability of submerged plant communities. Background technique [0002] A large number of practices of ecological restoration of shallow lakes have shown that after the lake reaches a clear water state, the submerged plant community is not stable enough and the ecosystem is not perfect, which leads to a rapid increase in the number of fish, which weakens or even leads to the failure of ecological restoration. [0003] The negative effects of herbivorous fish such as grass carp on ecosystem restoration efforts are well-studied. In fact, the negative effects of benthic fish are not small. Their foraging activities not only release sediment nutrients and promote the growth of phytoplankton algae, but more importantly, they can also suspend sediment, reduce water transparency, and inhibit s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32A01G22/00A01K61/10
CPCA01K61/10A01G22/00C02F3/327C02F2103/007C02F2209/36Y02A40/81
Inventor 李宽意吴庆龙韩燕青何虎
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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