Method for determining biological soil crust coverage

Abstract

The invention discloses a method for determining biological soil crust coverage. A soft polyvinyl chloride biological crust coverage determination box is made. Soft polyvinyl chloride plastic with the length of 40cm, the width of 40cm and the thickness of 2mm is selected, a square with the length and width of 30cm is drawn as square grids with the side length of 2.5 cm, the width of lines is 1mm, and 169 points are formed by the intersection of the lines. A throwing method is used to randomly select a quadrat in a sample area, distilled water is sprayed to wet biological soil crust, a plastic sample frame is horizontally laid on a quadrat to be measured, and the periphery of the plastic sample frame is pressed and fixed by sandbags or stone. If cryptogam is not covered, the corresponding position of a table remains blank. The recorded number of specific cryptogam specie is counted according to the table. In addition, a digital camera can be used to take picture closely just above the sample frame, a picture is taken to a room to carry out the determination of the biological soil crust coverage in a computer. The method is friendly to the environment, the biological soil crust is not destroyed, and the method is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of ecological environment, and relates to a method for measuring the coverage of biological soil crusts. Background technique [0002] Biological soil crust (BSC) is one of the important land cover landscapes widely distributed in the harsh environments of arid and cold regions, and its coverage accounts for more than 40% of the living cover of the desert surface, and it is an important construction of the desert ecosystem. and constituents. Biological soil crusts are microscopic particles of the soil surface that are surrounded by bacteria that live in the shallow soil (or sometimes on the soil surface), even up to a few millimeters above the surface; cyanobacteria. Diatoms or green algae, microscopic fungi, lichens and bryophytes, and common cryptogamous plants in the environment (non-vascular plant components use mycelium, rhizoids and secretions to "cement" the aggregated structure formed (complex and r...

AI Technical Summary

Problems solved by technology

This method is usually used in research, but it is not easy to observe because the sample frame and the needle block the line of sight, and when the surface is uneven, it is often necessary to insert the needle into the soil to destroy the biological soil crust, and give the fragile ecological environment the surface protection that has been formed for many years- -Biological soil crusts cause certain damage. This kind of sample frame is inconvenient to carry in the field, and the sample frame needle is easy to bend, causing certain errors in sampling

Images