Method for determining forest gap area lower limit

A technology for determining the method and area, applied in the field of determining the lower limit of the area, which can solve the problems of lack of scientific basis and unified standards, failure to quantify the concept of gaps, and difficulty of gaps in the wild.

CN111457900AActive Publication Date: 2020-07-28GUIZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-07-28

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Abstract

The invention discloses a method for determining a forest gap area lower limit. The method comprises the steps of: performing treading in the target area forest, and selecting a typical sample plot ora sample line capable of representing the area forest to perform crown gap quantity statistics; shooting a hemispherical image, wherein the principle is that: the area of the crown gap is measured according to the projection principle of a fisheye lens on the basis of a hemispherical image which is vertically and upwards shot in a forest gap; calculating the total area of crown gaps in the sampleplot or on the sample line; according to the total area of the crown gaps and the total number of the crown gaps, calculating an average crown gap area; calculating a crown gap area standard deviation; and representing the upper limit of the confidence interval of the crown void area, namely the lower limit of the forest gap area, by using the sum of the average crown void area and the standard deviation of the canopy void area. The method can be used for accurately representing the characteristic parameters of the forest gap area, so that the lower limit of the forest gap size can be objective and quantitative, a unified standard is provided for different forest gap researches, and the disordered situation of determining the lower limit of the forest gap area in the forest gap research field is changed.
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Description

technical field

[0001] The invention relates to a method for determining the lower limit of area, in particular to a method for determining the lower limit of gap area. Background technique

[0002] Forest gaps are common small-to-medium-scale disturbances in forests. They are special canopy gaps that can significantly increase the light intensity in the forest, thereby changing the composition of different light-demanding plants in the forest, and play an important role in forest regeneration and succession. , while ordinary canopy gaps have no significant effect on this. Gap size, shape, edge tree height, etc. are considered to be the main characteristic factors affecting gap regeneration; among them, gap size is the most important index to evaluate the environmental heterogeneity and resource allocation of gaps. The earliest term "forest gap" appeared in the term "Storm gapstructure" in Secrader's 1936 Norwegian spruce paper; Disturbance (small-scale such as tree lodgin...

Examples

Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

[0028] Embodiment of the present invention: a method for determining the lower limit of the gap area, as attached Figure 1-2 Shown, the lower limit of the gap area defined by the present invention is represented by the sum of the average forest canopy area MCA and the standard deviation CACD of the forest canopy area; the forest gap can significantly enhance the intensity of light in the forest, thereby changing the composition structure of different light-demanding plants under the forest. The renewal and succession of canopy have an important role; while the effect of common canopy gaps is not significant. Therefore, it is considered that the gap area should be significantly larger than the normal canopy gap, that is, the gap area should be larger than the confidence interval range of the canopy ...