A method for testing the oxygen consumption rate of pond bottom

Abstract

The invention relates to a method for testing a pond sediment oxygen consumption rate, belonging to the technical field of water environment regulation and improvement. The method for testing the pond sediment oxygen consumption rate comprises the following steps: selecting 3-4 sediment test points in a pond, and vertically mounting 1-2 cylinders with the diameters being 10-20cm at each test point, wherein the lower part of each cylinder is pressed into the sediment to exceed 10cm, and the upper part of each cylinder is over 20cm higher than the water outlet surface; pumping the water in the cylinders and introducing equivalent clean oxygen-enriched water; standing the water in the cylinders for 24 hours, and testing the content of dissolved oxygen of water in the cylinders before and after standing; and finally, calculating the sediment oxygen consumption rate by using the test data. According to the method disclosed by the invention, the sediment oxygen consumption rate is tested in the pond in situ by adopting the cylinders, and the influence on the test precision caused by the environment is alleviated, so that the measurement result is close to actual conditions.

Description

technical field [0001] The invention belongs to the technical field of water environment regulation and improvement, in particular to a method for testing the oxygen consumption rate of pond bottom. Background technique [0002] In the process of pond culture, a large amount of feed and fertilizer are often required. Most of these substances are deposited to the bottom of the pond in the form of fish and shrimp feces and residual bait to form a substrate, which makes the substrate contain a large amount of organic matter. As a stable pollution source in ponds, these organic substances have an important impact on the consumption of dissolved oxygen in ponds, and measuring their oxygen consumption rate is of great significance to aquaculture. [0003] Existing methods for testing the oxygen consumption rate of sediments: Some methods take a certain amount of sediments and put them in water to stir for several hours, and calculate according to the changes of dissolved oxygen in...

AI Technical Summary

Problems solved by technology

These methods all have the disadvantage of destroying the original sediment layer.

Domestically, Lei Yanzhi directly measures the oxygen consumption rate of the fish pond sediment by using a cylindrical mud extractor with simple equipment, easy operation and good precision, which can be used as a routine method for measuring SOD in fish ponds; however, this method requires The bottom mud is taken out from the pond and brought into the external simulated environment, which is separated from the original environment of the bottom mud of the pond, which will affect the test accuracy

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