Calculation methods are as follows:

1, forest timber volume calculation methods

Commonly used formula:

①The chest height form number method:

V=g1.3Hf1.3

The formula V for the trunk timber volume; g1.3 for the chest height cross-sectional area; H for the height of the tree; f1.3 for the chest height form number. The number of forms is generally based on a large number of logging down the measured data obtained after mathematical statistics, the experimental regression formula, the preparation of different species of trees of various diameters and heights of the form of the number of tables, in the calculation of the volume of lumber to check with.

②Experimental shape method:

V=g1.3(H+3)fэ

Experimental shape fэ is an empirical coefficient based on a large amount of data analysis, which changes with the height of the tree than the height of the chest shape of a much more stable, most of the species of the fэ is concentrated in the 0.40 to 0.44 between. It can be treated as a constant according to the specific situation.

2. Calculation method of forest volume

The calculation method of stump volume:

The volume of original timber is divided by the timber yield of the species. For example: a region, a species of timber rate of 60%, that is: stumpage (stumpage) = original timber volume ÷ 60%. The original timber volume is cut down wood according to the need to cut into different sections, the volume of each section is added to the original timber volume.

In the vicinity of the logging plot, select the same species of trees to measure the diameter of the chest and root diameter (the measurement site should be consistent with the logging pile, the number of measurement plants should reach a certain number, usually more than 30 plants per diameter step to ensure the accuracy of the estimation), the use of the diameter of the chest and root diameter of the data to choose the model regression, you can choose the straight line equation D1.3 = a + bD roots or parabolic equation D1.3 = a + bD roots + CD2 Root for regression fitting, calculate the correlation coefficient and the remaining standard deviation for testing, and then use the regression equation to estimate the site of each logging root diameter, check the one-dimensional stumpage table can be derived from the corresponding volume.

Extended information:

. p>The difference between the wood volume and storage of forest trees:

A, the two investigation methods are different:

1, the investigation method of tree storage: sample plot method, angle gauge tree measurement method, the whole forest each wood checking feet method.

2, the amount of timber survey methods: standard wood survey, standard ground survey.

Two, the calculation of the two different:

1, the calculation of tree volume: its calculation method is the first in the forest survey of each species of trees in the single-plant survey, resulting in single-plant volume, and then the single-plant volume multiplied by the number of each species of trees in the forest of a place that is obtained.

2, the calculation of the amount of timber: the calculation of the amount of timber, respectively, timber species (large, medium and small diameter timber, short and small timber, fuelwood) section, using 2 meters or 1 meter distinction between the central cross-section of the volume method, the calculation of the timber species with the skin, peeled timber, and then calculate the specification of the timber, non-specification of the timber and its integrated timber volume.

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