Method for determining high-nitrogen and/or high-phosphorus risk area of lake deposits
A sediment and surface sediment technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems that are difficult to answer accurately, cannot accurately reflect the eutrophication of lakes, and the predictability assessment of ecological risks of the degree of eutrophication
Active Publication Date: 2014-11-05
姜霞 +5
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Problems solved by technology
Since there is no quality classification standard for nitrogen and phosphorus nutrients in sediments, the analysis of the nitrogen and phosphorus content of eutrophic lakes in the existing technology cannot accurately reflect the true status of lake eutrophication, and it is difficult to exactly answer what is meant by "high nitrogen content". , phosphorus” problem, it is more difficult to predict the degree of eutrophication and possible ecological risks that may occur in endogenously polluted water bodies based on the nitrogen and phosphorus content in sediments.
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Embodiment 1
[0063] 1) Embodiment one: the method for establishing lake sediment nitrogen or phosphorus quality classification standard
[0064] a) Collect multiple surface sediment samples of the lake to be analyzed.
[0065] Taking Taihu Lake, a lake with severe eutrophication in my country, as an example, when collecting sediment samples, it should be noted that the lake area with severe eutrophication should be properly intensified, such as selecting 100 sampling points as samples. It is best to process the samples in time after collection, and freeze-drying is generally used.
[0066] In order to obtain better research results, it is best to use a low-disturbance columnar sampler to collect, and it is best to select sediments of about 1-20cm on the surface of the lake bottom mud, with about 10cm as the best collection area.
[0067] b Taking the content of ammonia nitrogen and total nitrogen (mg / kg) as the index, measure the content of ammonia nitrogen and total nitrogen on the surfa...
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The invention relates to a method for determining a quality classifying standard of nitrogen and / or phosphorus in deposits by using the nutrition state of a lake water body and a nitrogen and / or phosphorus adsorption / desorption experiment on deposits in the lake water body and further determining a high-nitrogen and / or high-phosphorus risk area of the lake deposits. Specifically, the invention relates to a method for establishing a lake deposit quality classifying standard by taking nitrogen and / or phosphorus in the lake deposits as an index. The method comprises the following steps of: determining the threshold value of the content of dissolvable nutrient salts in a water body by using a eutrophic model when the water body undergoes eutrophication and / or severe eutrophication; resolving the nitrogen and / or phosphorus balance concentration of the deposits through an adsorption-desorption experiment; performing equation fitting on chemical data of the deposits and the adsorption and desorption balance concentration of nitrogen and / or phosphorus in the deposits; and bringing the threshold value of the content of the dissolvable nutrient salts in the water body when the water body undergoes the eutrophication and / or the severe eutrophication into an equation to establish a quality classifying standard of nitrogen and / or phosphorus in the lake deposits. Correspondingly, the invention further relates to a method for determining a high-nitrogen and / or high-phosphorus risk area. According to the method disclosed by the invention, the nutrition state of a lake can be evaluated effectively and conveniently.
Description
technical field [0001] The invention relates to a method for high nitrogen or phosphorus risk areas of lake sediments, in particular to a method for determining high nitrogen or phosphorus risk areas of lake sediments by establishing quality classification standards for nitrogen or phosphorus nutrients in lake sediments. Background technique [0002] Eutrophication of lakes has become a worldwide environmental problem. [0003] A large number of studies on lake eutrophication show that the fundamental factor of lake eutrophication is the overload input of nutrients. This is a dynamic process, and the overload input of nutrients leads to a large proliferation of phytoplankton. On the one hand, the transparency of the water body decreases, leading to the degradation of submerged higher vegetation; on the other hand, a large number of algae and plankton corpses sink to the bottom of the lake, and bacteria deplete the oxygen at the bottom of the lake to decompose these organic ...
Claims
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IPC IPC(8): G01N33/00
Inventor 姜霞王书航王秋娟金相灿钟立香陈春霄
Owner 姜霞