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Method for determining forest community minimum survey area using mathematical model

A forest community and mathematical model technology, applied in the field of statistical investigation, can solve the problems of low accuracy, difficulty in determining the standard of flattening curve, heavy workload, etc., and achieve the effect of high accuracy

Inactive Publication Date: 2010-07-14
INST OF FORESTRY CHINESE ACAD OF FORESTRY
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  • Application Information

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Problems solved by technology

[0005] The standard for flattening the curve is not easy to determine and the accuracy is low. In addition, this method has a large workload, and the time and cost of investigation are high

Method used

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  • Method for determining forest community minimum survey area using mathematical model
  • Method for determining forest community minimum survey area using mathematical model
  • Method for determining forest community minimum survey area using mathematical model

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specific Embodiment

[0024] Five large sample plots were used for analysis, and these five large sample plots were from China, Mongolia, Myanmar, South Africa and Germany. Among them, the South African plot belongs to the subtropical natural broad-leaved forest, with an area of ​​11850m2 2 , the Chinese plot belongs to the temperate deciduous mixed forest, with a plot area of ​​10,000m 2 , the German sample plot is a temperate deciduous mixed forest with an area of ​​5740m 2 , the Mongolian sample plot is taiga forest, and the area of ​​the sample plot is 2500m 2 , the sample plot in Myanmar is a tropical forest with an area of ​​10,000m 2 . These data contain the spatial location coordinates and tree species composition of all forest trees.

[0025] Such as figure 1 As shown, the calculation area starts from the center of the large sample plot and selects a central sample plot of 10m×10m. 45m, 50m×50m, 55m×55m, 60m×60m, 70m×70m, 80m×80m, 90m×90m, gradually expand, and count the tree species...

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Abstract

The invention discloses a method using a mathematical model to determine minimum survey areas of forest communities. A quadrat is selected in a forest community, the area of the quadrat is gradually enlarged, the quantity of tree species that different areas of the quadrat correspond to is statisticized, the species-area relation of the quadrat is characterized by adopting a Monod model (S is equal to aA / (1+bA)), and then the Monod model is evaluated a second order reciprocal S''. When the S'' is equal to zero or approaches to zero, the corresponding area is the minimum survey area of the forest community. The method has higher accuracy, convenience and easy operation.

Description

technical field [0001] The invention relates to a statistical survey method, in particular to a method for determining the minimum survey area of ​​a forest community with a mathematical model. Background technique [0002] A forest ecosystem must occupy a certain area, and all the vegetation in this area is not piled up in disorder, but has a certain composition structure and forms a unified whole with its environment. The size of the sample plot is an important content in the forest survey. The size of the survey area is of great significance to properly represent a certain forest type, and it directly affects the survey accuracy and cost. Accurate surveys must be carried out on a suitable area. Therefore, it has attracted the attention of many scholars. The ancient way to determine the species composition of a plant community is to carry out species statistics on this community section, but because a community section usually occupies a large area, and the species distri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06N7/00
Inventor 惠刚盈
Owner INST OF FORESTRY CHINESE ACAD OF FORESTRY