| In order to popularize and improve the culture technology of Amur ide in medium alkalinity ponds and improve the comprehensive utilization of water and soil resources in saline-alkali land,a medium alkalinity intercropping mode of mainly raising Amur ide and intercropping Bighead carp was designed,which promoted the popularization of Amur ide in northern medium alkalinity saline-alkali ponds,made the proportion of zooplankton and plants in water body suitable,increased dissolved oxygen in water body and improved water quality,which was more suitable for the growth of cultured fish.In this paper,taking the pond with medium alkalinity as the experimental background,we selected Leuciscus waleckii and Aristichthys nobilis as experimental materials,and studied the water quality regulation in view of the unfavorable factors such as high alkalinity,high p H,abundant zooplankton and relatively low dissolved oxygen in the pond with medium alkalinity,and provided data support for the establishment of the culture mode of the pond with medium alkalinity.The results can promote the establishment and popularization of the intercropping model of Amur ide in bicarbonate alkalinity ponds in northern China,provide comprehensive utilization rate of saline-alkali land with medium alkalinity,and realize the purpose of green culture in saline-alkali ponds to increase production and increase efficiency.The main contents are as follows:(1)From August to October,2020,15 sampling points were set up in three ponds with moderate alkalinity in Lianhuan Lake,Daqing to identify zooplankton and detect water environmental factors,analyze the community structure characteristics of zooplankton,evaluate water quality by diversity analysis,on-hand quantity method and physical and chemical factor analysis,and analyze the correlation between zooplankton and water environmental factors in ponds by pearson.The results showed that 28,34 and 28 zooplankton species were identified in ponds No.1,No.2and No.3 respectively,among which 9,11 and 10 species were protozoa,12,16 and15 species were rotifers,5,5 and 1 species were cladocera,and 2 species and genera were copepods.The mean abundance of zooplankton in the three ponds is 10264.89ind/l,9416.89 ind/l and 3939.33 ind/l respectively,and the mean biomass is 17.03mg/L,20.69 mg/L and 8.14 mg/L respectively.The mean value of total nitrogen and total phosphorus in water is 2.69 mg/L and 0.91 mg/L,and the experimental ponds are all eutrophic water bodies.This study can provide theoretical basis for water quality control of medium alkalinity aquaculture ponds.(2)From May to August,2021,15 subgrade enclosures were set up in alkalinity ponds in Lianhuanhu Lake,Daqing,and an experimental group was designed for the ratio of four kinds of Amur ide to bighead carp.The zooplankton was identified and the water environment factors were detected.The comprehensive nutrition index method and zooplankton diversity were used to evaluate the water quality,and the community structure characteristics of zooplankton were analyzed.pearson was used to analyze the correlation between zooplankton and water environment factors in ponds.The results showed that 49,50,55,54 and 49 zooplankton species were identified in the ponds of control group C0 and experimental group C1 with 5%Bighead carp,C2 with 10% Bighead carp,C3 with 15% Bighead carp and C4 with20% Bighead carp,respectively,among which the protozoa were 18 and 18 respectively.There are 9,8,6,6 and 6 species and genera respectively,with 10 dominant protozoan species and 6 dominant rotifer species.It is found that the C2 group with 10% bighead carp can control the macrozooplankton well,and keep the zooplankton in a proportion suitable for the growth of Amur ide.and increase the chlorophyll content and dissolved oxygen in the water.It is suggested to interplant10% bighead carp with the best density of 25g/m3.This study provides basic data for water quality control of medium alkalinity aquaculture ponds. |
PDF Full Text Request