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Method for measuring forest gap area

A technology of area and forest gap, applied in the fields of forestry and ecology, can solve the problems of large errors and poor precision, and achieve the effect of improving practicability and estimation accuracy

Inactive Publication Date: 2008-05-07
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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Problems solved by technology

The first two methods are used more often, the ellipse method is the simplest and used more often, but the accuracy is poor, especially when the shape of the forest gap is complex, the error is relatively large

Method used

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  • Method for measuring forest gap area
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  • Method for measuring forest gap area

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Embodiment Construction

[0020] (1) The experimental site was selected from a forest ecological experiment station (41°51.102′N, 124°54.543′E), with an altitude of 252-1116m. The climate is warm temperate continental monsoon climate, with long and cold winters and hot and rainy summers. The annual average temperature is 3.9-5.4°C, the extreme maximum temperature is 36.5°C, and the minimum is minus 37.6°C. The annual active accumulated temperature greater than 10°C is 2497.5-2943.0°C, the frost-free period is 120-139 days, the annual average sunshine is 2433 hours, and the annual precipitation is 700-850mm, and the rainfall is concentrated in June-August. The vegetation belongs to the Changbai Mountains system, mainly natural secondary forests, and the construction species include Fraxinus rhynchophylla, Quercus mongolica, Acer mono, Juglansmandshurica, etc., and some There are long white larch (Larix olgensis) plantations and Korean pine (Pinuskoraiensis) plantations, as well as a small area of ​​rem...

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Abstract

The invention relates to forestry science and ecology, in particular to a method for measuring the forest gap area, that is, the area between two adjacent sides from the center of the forest gap to the boundary of forest gap canopy along multiple equipartition compass directions is considered as an elliptic sector, and the forest gap area is estimated with the area sum of the elliptic sectors, which is called Equiangular Elliptic Sectors (EESs), wherein, the area of the elliptic sector is calculated as follows: firstly, determining the elliptic parameters, and calculating the specific ellipse polar equation of the area intermediate value of the elliptic sector with the standard ellipse polar equation; then calculating the elliptic sector area through integral computation of the area intermediate value of the elliptic sector. The invention has the advantages of easy operation and ability of improving the area estimation precision of the forest gap.

Description

technical field [0001] The invention relates to forestry and ecology, in particular to a method for measuring the area of ​​forest gaps. Background technique [0002] Since Watt proposed the concept of forest gap in 1947, many related studies have been carried out abroad, among which forest gap regeneration is one of the focuses of attention, and the forest cycle theory based on forest gap regeneration has gradually been updated. accepted by many scholars. The formation of the gap changes the availability of resources (light, temperature, water, soil nutrients, etc.) influences. Gap features mainly include gap area, shape, gap aperture and height of trees at the edge of gaps, among which gap area is the most important feature of gaps, and there are two main definitions: canopy gap ) and expanded gap, the former is defined as the vertical projected area of ​​the wood canopy at the edge of the forest gap, and the latter is defined as the area enclosed by the tree trunks at ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/28
Inventor 胡理乐朱教君
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI