A method for measuring the short-term sedimentation rate of constructed wetlands

A technology of constructed wetlands and deposition rate, applied in soil material testing, measuring devices, instruments, etc., can solve the problems of human exposure risk, lack of measurement methods, complicated processing steps, etc. Intuitive results

Active Publication Date: 2020-12-15
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

The above-mentioned dating and deposition rate determination methods have disadvantages such as complicated processing steps, high price, and human exposure risks.
The short-term sedimentation rate of sediments can be used to indicate the exchange process of sediments and water bodies in the study area, but there is still a lack of simple and effective measurement methods

Method used

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  • A method for measuring the short-term sedimentation rate of constructed wetlands
  • A method for measuring the short-term sedimentation rate of constructed wetlands
  • A method for measuring the short-term sedimentation rate of constructed wetlands

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Experimental program
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Embodiment 1

[0042] 1. In 2017, the artificial wetland in the 2002 restoration area of ​​the Dawenliu Reserve in the Yellow River Delta was selected (the wetland was built 15 years ago), and high-resolution (1-2cm) profile sediment samples were collected at a sampling depth of 50cm. The collected samples were frozen Dry, remove impurities and grind through a 100-mesh sieve for testing;

[0043] 2. Take an appropriate amount of sediment, use an elemental analyzer to measure the content of TOC and TN in the sediment, and use an isotope mass spectrometer to measure the stable carbon isotope (δ 13 C) content.

[0044] 3. Plot TOC and TN content, stable carbon isotope (δ 13 C) The content changes with the sediment profile (such as Figure 1~3 shown), the sedimentation depth "disruption point" (d 0 ) can be obtained by formula (1) (2), TOC, TN and stable carbon isotope (δ 13 C) Fitting result of content d 0 Both are 10cm.

[0045] Finally, according to the deposition depth (d 0 ) and form...

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Abstract

The invention relates to a determination method for a constructed wetland short-term deposition rate. The determination method comprises the following steps of collecting constructed wetland profile deposits, and determining contents of total organic carbon (TOC) and total nitrogen (TN) in the deposits as well as the content of stable carbon isotope (delta 13C); determining a deposition depth of aconstructed wetland through 'points of abrupt changes' of the contents of the TOC and the TN of a profile as well as the content of the carbon isotope; and finally, calculating the constructed wetland deposition rate according to the deposition depth and a wetland building time. Compared with a radioactive isotope dating method, the determination method provided by the invention has the advantages of simpleness and convenience in treatment steps, accuracy and reliability in results, low test cost, avoidance in human body exposure risk and the like.

Description

technical field [0001] The present invention relates to a short-term (several years to several decades) sedimentation rate measurement method, in particular to a method for studying short-term sedimentation deposition rate by utilizing "mutation points" in properties before and after the formation of constructed wetlands. Background technique [0002] Known as the "kidney of the earth", wetlands have a strong ability to filter and settle foreign pollutants, and are "purifiers" of pollutants. The removal of pollutants by wetlands mainly includes biological processes and abiotic processes. Pollutants removed by biological processes also end up in ecosystem cycles. The abiotic process, that is, the adsorption, precipitation and final deposition and burial of pollutants on the surface of sediments, determines the process and efficiency of wetland purification of pollutants. [0003] To study the deposition process and efficiency of pollutants in wetlands, it is first necessary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N33/24G06F17/18
CPCG01N13/00G01N33/24G06F17/18
Inventor 徐刚吕迎春宋佳伟韩广轩
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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