A method for measuring the cross-section plane of forest fallen wood combustible load

A method of measurement, technology of section planes, applied in the field of forest ecology

Active Publication Date: 2019-08-27
GUANGXI FORESTRY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the technical problems existing in the current investigation of forest combustibles, aiming to provide a method for measuring the cross-sectional plane of the forest fallen wood combustible load

Method used

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  • A method for measuring the cross-section plane of forest fallen wood combustible load
  • A method for measuring the cross-section plane of forest fallen wood combustible load
  • A method for measuring the cross-section plane of forest fallen wood combustible load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Full-rotation design of sample line and layout of section plane

[0061] The random rotation of the transect is the precondition that must be met to calculate the load by the fuel points; it is assumed that the survey is a pine-oak cone mixed forest; figure 1 As shown by the dotted line in the middle, the parallel interval of the Sichuan line is 100m, and sampling points are set at random starting points and equidistant intervals of 40m on the Sichuan line, and a small steel braze is laid at each sampling point one by one to fix the starting end of the measuring tape; each sampling point is randomly determined by throwing dice. The transect direction of the point, as in figure 1 The first Sichuan line on the left in the center throws the dice 7 times, which are 1, 2, 3, 4, 6, 5, and 4 points, so the direction of the first Sichuan line from bottom to top is 0, 30, 60, 90, 150, 120, 90 degrees ( figure 1 ); after the direction of the transect is determined at the sampli...

Embodiment 2

[0064] Measuring combustible depth and humus depth

[0065] From 0 to 0.9m from the sampling point, divide into three 0.3m intervals and repeat 3 times to record the depth of combustibles ( figure 2 ), the accuracy is ±3cm; the depth of combustibles refers to the vertical distance from the highest intersection point of dead combustibles in the interval to the bottom layer of litter in the interval, and those higher than 1.8m are not counted. Litters include freshly fallen leaves, pine needles, tree Skins, fruits, pollen balls, etc.;

[0066] Use a plastic ruler to measure the humus depth at two points below the cross-sectional plane 0.3m and 1.2m away from the sampling point, with an accuracy of ±3mm; humus includes semi-decomposed and fully decomposed litter; if the central axis of the rotten wood is in the humus layer, the depth of the humus layer to the bottom of the rotten wood; if the central axis of the rotten wood is in the litter layer above the humus layer, the rott...

Embodiment 3

[0068] Points pour wood combustibles

[0069] The number of combustibles in three diameter classes of 0~0.6cm, 0.6~2.5cm, and 2.5~7.6cm where the points intersect with the section plane, the diameter class is based on the diameter of the combustibles at the intersection point, and the diameter of the combustibles is the same as that of the combustibles The long axis is vertical; if there are too many combustibles in the fine wood, use the dichotomy method for secondary sampling, and only count one-half of the combustibles;

[0070] Use a straightedge to measure the self-diameter of all thick wooden combustibles with a diameter ≥ 7.6cm intersecting the section plane, and measure at the intersection point with an accuracy of ±2cm; record them separately for rotten wood and good wood;

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Abstract

The invention discloses a line transect plane measuring method for loading capacity of falling forest wood combustibles. The design of systematic sampling and random complete rotation of line transect is adopted, three diameter grades of 0-0.6cm, 0.6-2.5cm and 2.5-7.6cm are adopted for counting fine falling wood combustibles and the thick falling wood combustibles with the cut intersection diameter more than or equal to 7.6cm are only counted without the complex steps of combustible collection, weighting, drying, and the like; and meanwhile, the measurement requirement for combustible depth and humus depth is put forward; a line transect plane method-based computational formula for the falling forest wood combustibles only adopting a metric system unit is established by tracing the source of computational formula for the loading capacity of the combustibles; the principle of adjusting line transaction length and simplifying decimal digits by classifying the diameter grade of the combustibles is clarified; the excessive decimal digits generated by arbitrarily applying the imperial unit to the diameter classification and the line transect length can be reduced; the precision requirement for each combustible is set; and the fieldwork investigation efficiency for the forest combustibles is increased.

Description

technical field [0001] The invention belongs to the field of forest ecology, and relates to the classification investigation and load calculation of fallen wood combustibles in forests, and in particular to the cross-sectional plane measurement of the loads of fallen wood combustibles in forests. Background technique [0002] The investigation of the combustible load of fallen wood in the forest can provide basic information for forest fire prevention, timber utilization and forest management decision-making. Since the 1940s, Western scientists have carried out a lot of in-depth research on forest fuel survey methods. By the end of the 1960s, the fuel transect survey method was gradually formed. The angle θ between the combustibles and the sample line has a great influence on the load estimation. If θ=π / 2, the possibility of the combustibles intersecting the sample line is the greatest, and the cross-sectional area of ​​the intersection point is the smallest; if θ=0, the com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/46G01B21/00
Inventor 黄小荣彭玉华谭一波欧芷阳何琴飞
Owner GUANGXI FORESTRY RES INST
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