Method for in situ restoration of eutrophic water body using aquatic Coix coix

Abstract

The invention discloses an application of coix aquatic roxn in in-situ repair of a eutrophic water body, and a method for in-situ repair of the eutrophic water body by using the coix aquatic roxn, which belong to the field of pollution control methods for rivers and lakes. The method comprises the following steps: firstly, separating stumps of the coix aquatic roxn; secondly, culturing tillering seedlings in a sediment mixed matrix for 25-30 days, and then performing acclimation culture in clear water; and finally, transplanting the seedlings into the eutrophic water body to be repaired. The coix aquatic roxn in the method is hexaploid, and the biomass, plant height and tillering of the hexaploid coix aquatic roxn are significantly higher than those of tetraploid coix aquatic roxn, and the nitrogen and phosphorus absorptive power of the hexaploid coix aquatic roxn are obviously stronger than that of the tetraploid coix aquatic roxn; secondly, the coix aquatic roxn has stronger adaptability to an aquatic environment, and belongs to wild plants, so that the coix aquatic roxn has strong adaptability to environments and does not need special management; moreover, the coix aquatic roxn is perennial and can be repeatedly cradled regularly; and the coix aquatic roxn is cultured by virtue of vegetative propagation, only vegetative growth is performed, and wide spread and biological invasion harms cannot be caused.

Description

technical field [0001] The invention belongs to the field of pollution control methods for rivers and lakes, and in particular relates to a method for in-situ restoration of eutrophic water bodies by using aquatic coix coix. Background technique [0002] Since the beginning of the 20th century, the problem of eutrophication caused by the discharge of a large amount of industrial wastewater and domestic sewage, and the loss of fertilizer after the application of a large amount of chemical fertilizers has become increasingly serious. The eutrophication of the water body deteriorates the water quality of the water source, increases the nutrient salt in the water, and leads to a large increase of algae such as blue-green algae. The algae consume dissolved oxygen in the water, and cause the water body to be hypoxic and rancid, causing harm to aquatic animals such as fish and shrimp. Cyanobacteria produce toxin after death, which can be enriched in fish, and the toxin can be trans...

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Problems solved by technology

[0004] Tetraploid Job's tears (2n=20) (Coix Lacryma-jobi L.) has a good ability to remove various forms of nitrogen and phosphorus in eutrophic water bodies, and can effectively control water eutrophication (Gao Chong, Master’s Degree Thesis of Zhejiang University, 2008), but tetraploid coix is ​​not an aquatic plant, and its growth in water is limited to a certain extent; secondly, tetraploid coix is ​​an annual plant, which needs to bloom and bear fruit, and its vegetative body grows into a certain period of time. Flowering and fruiting after the reproductive growth period, the ability to absorb nitrogen scales decreases, so it needs to be planted every year; in addition, its fruiting characteristics make it difficult to control the population of tetraploid Coix, which will cause the problem of biological invasion

[0006] After searching, there is no report of aquatic Coix as a plant for eutrophic water restoration

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