Method for utilizing angle gauge to measure forest stand crown density

Abstract

The invention discloses a method for utilizing an angle gauge to measure forest stand crown density and belongs to forest resource survey methods. The method is characterized in that the angle gauge serves as a tool, by adopting an angle gauge counting survey method and measuring a diameter at breast height of each counted tree, diameter class distribution per hectare is obtained, the plant number of each diameter class per hectare in a forest stand can be calculated, corresponding crown breadth values of trees of each diameter class are found out according to an established unary diameter crown table, and the forest stand crown density of a surveyed area can be obtained through a crown density principle. The advantages that the angle gauge is light, convenient, flexible and low in cost are fully utilized, cost of field survey is reduced, and efficiency of office work treatment and field operation of the forest stand crown density is improved. By establishing the unary diameter crown table taking various crown breadth influence factors into account, calculating precision of the forest stand crown density is greatly improved, and the shortcomings that in previous forest stand crown density survey, the precision is low if methods are simple, and the process is complex if the precision is high are overcome.

Description

1. Technical field [0001] The invention relates to a method for investigating forest resources, in particular to a method for measuring stand canopy density with an angle gauge. 2. Technical background [0002] Canopy density is one of the important stand survey factors and is widely used in forest structure survey and ecological evaluation. Canopy density is not only an important index for determining the intensity of tending and harvesting in forest management, but also an indispensable factor for estimating forest stock volume. All countries in the world also regard canopy density as an important factor for judging forests. In recent years, canopy density has been widely used in many aspects such as soil and water conservation, water conservation, forest photosynthesis, forest management, wild animal habitat, and forest stand quality evaluation. [0003] However, there are still few studies on the measurement methods and instruments of canopy density at home and abroad, ...

AI Technical Summary

Problems solved by technology

[0004] ①Although the visual method is relatively simple, it is an extensive measurement with large errors;

[0005] ② Although the map method is more accurate than the visual method, it takes more time and manpower for data collection and internal processing;

[0006] ③ Since a plot can only include the canopy of a few trees, it is difficult to accurately reflect the actual situation of canopy density of a large-scale forest stand by the map survey method;

[0007] ④ The above-mentioned measurement tools have not been widely used, and the cost of introduction is high

[0008] The above defects are all due to the fact that the basic connotation and survey methods of canopy density have not received enough attention, and there are problems such as vague concepts and extensive calculation methods, which are difficult to meet the needs of forestry production and ecological construction with increasing standards.

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