Method of setting rocky desertified area vegetation investigation sampling unit

A sampling unit, rocky desertification technology, applied in the field of plant ecology, can solve the problems of small number of shrubs and grasses, large influence of human preference, long investigation time, etc., to reduce walking distance and vertical climbing, good effect, The effect of improving efficiency

Active Publication Date: 2017-08-11
GUANGXI FORESTRY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing domestic forest vegetation survey method uses a large sample square of 20×20m as the sampling unit, and each plant with a diameter above 1cm in the sampling unit is inspected for each tree, and five small sample squares of 1×1m are taken at the four corners and the center of the large sample square to investigate shrubs and herbaceous plants ; The results of copying and applying this forest community survey method in rocky desertification areas are: long survey time, high cost, small number of small shrub and grass quadrats, and great influence of human preference

Method used

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  • Method of setting rocky desertified area vegetation investigation sampling unit

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Comparison scheme
Effect test

Embodiment 1

[0041] The rocky desertification mountainous area with less obstacles in the straight direction adopts the direct line method to set the sampling unit.

[0042] The specific method of the direct line method is as follows:

[0043] a. Determine the first Sichuan line: nail a small steel brazing at the random starting point at the foot of the mountain to fix the starting end of the measuring tape, and pull the measuring tape from the foot of the mountain to the top of the mountain along the direction where the altitude gradient changes the most on the mountain, and fix the measuring tape with a steel brazing on the top of the mountain At the end, the tape is tight and close to the ground, and the tape direction is perpendicular to the contour line; the vertical projection of one side of the tape on the ground between the two steel rods is called a Sichuan line;

[0044] b. Determine the rest of the river lines: After the first river line is determined, the rest of the river line...

Embodiment 2

[0050] In the rocky desertification mountainous area where the travel in the straight line is blocked and the visibility is poor, the sampling unit is set by the rope segment netting method.

[0051] The specific method of the rope segment netting method is:

[0052] a. Prepare the rope: first cut the red grass ball plastic packaging rope indoors into several 5.04m long rope sections, and each rope section is self-twisted into a small turn for later use;

[0053] b. Draw up the river line and baseline: the direction of the river line is perpendicular to the contour line, from the foot of the mountain to the top of the mountain, that is, the river line is parallel to the direction with the largest gradient change in altitude; the baseline is located at the foot of the mountain, perpendicular to the river line;

[0054] c. Netting: Take a 20m×20m large quadrat divided into 16 5m×5m grids as an example; start from the baseline at the foot of the mountain, and build a net towards ...

Embodiment 3

[0057] In the rocky desertification mountainous area with thorny thorns, parallax, large drop, and extreme difficulty in walking, the sampling unit is set by the method of saving point coordinates.

[0058] The specific method of saving point coordinate method is as follows:

[0059] a. Determine the Sichuan line: correct the electronic compass and altitude on site, delete all the waypoints originally saved by the GPS, so that each plot setting starts from the GPS storage point 001, first measure the angle direction of the Sichuan line from the foot of the mountain to the top of the mountain, and determine the Sichuan Line direction, calculate the angle α between Sichuan line and true north or due west, due east (such as figure 1 As shown), establish the coordinate axis, the direction of the Sichuan line is parallel to the Y axis, and the direction of the baseline is parallel to the X axis;

[0060] b. Save points: At the random starting point of the baseline at the foot of t...

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Abstract

The invention discloses a method of setting a rocky desertified area vegetation investigation sampling unit; dividing a sample land into three grades according to its terrain and vegetation conditions, and setting a sampling unit respectively by means of direct parallel line process, rope segment netting process and preserved coordinate process, wherein the direct parallel line process includes setting parallel lines with tapes, and capturing sample points along the parallel lines, extending transects or setting small quadrats at equal intervals, the rope segment netting process includes segmenting the parallel lines through rope marking mesh, and sampling along the segmented parallel lines, and the preserved point coordinate process includes determining positions of the parallel lines and taking samples according to GPS (global positioning system) preserved points and azimuth information, and avoiding obstacles by detouring. The method according to the invention provides a sample, feasible, accurate and efficient solution for how to maintain quadrats isometric, maintain the parallel lines parallel and avoid sampling preferences in difficult site vegetation investigation, and the method is significant to the accurate understanding of desertified vegetation changes and guidance for the treatment of stony desertification.

Description

technical field [0001] The invention belongs to the field of plant ecology, and relates to a technical method for investigating vegetation resources in rocky desertification areas, in particular to a method for setting sampling units for vegetation investigation in rocky desertification areas. Background technique [0002] In plant community surveys, sampling surveys are usually used to measure vegetation coverage, vegetation density, species frequency, plant diversity, bare rock rate and bare soil rate. Several repeated sampling units are set in a large sample square, and the overall changes are inferred from the statistical analysis results of the sampling units. There are two ways to improve the accuracy of sampling survey results: increasing the number of samples and reducing the standard deviation between repetitions. Increasing the number of samples means increasing the cost of the survey, which is not feasible in many cases; therefore, reducing the standard deviation...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N1/02
CPCG01N1/02G01N33/0098G01N2001/021
Inventor 黄小荣彭玉华侯远瑞欧芷阳何琴飞谭一波
Owner GUANGXI FORESTRY RES INST
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