Solitary Tree Regeneration Survey Method

Abstract

A method for investigating isolated tree renewal is provided. In the field of forest tree renewal investigation, a single isolated tree is used as the center to draw rays, with a total of 8 rays, namely, 8 directions of east ray, southeast ray, south ray, southwest ray, west ray, northwest ray, north ray and northeast ray; concentric circles are drawn with the tree trunk as the center, and the concentric circles are drawn from the inside to the outside in sequence, and the intersection of the concentric circles and the rays is the center point of the understory plot; two parallel lines are drawn on both sides of each ray, and the intersection of the parallel lines and the concentric circles is the center point of the outstory plot. The intersection of the rays and the parallel lines with the concentric circles is three repetitions of the investigation plot. The present invention does not have a unified method for investigating isolated tree renewal, and designs a group of methods when investigating isolated tree renewal. Through the method of the present application, the data investigated can truly reflect the number of isolated tree renewal seedlings, growth conditions and movement direction of tree seeds.

Description

Technical Field

[0001] The invention relates to the technical field of forestry investigation, and in particular to a method for investigating the renewal of isolated trees. Background Art

[0002] A standing tree is a tree that grows alone in an open area. Because it is separated from the forest environment, it has the characteristics of being shorter, having a larger crown, more branches, more fruit, a sharp trunk, and a well-developed root system compared to forest trees. There is no unified method for surveying the regeneration of isolated trees. Summary of the invention

[0003] In view of this, it is necessary to provide a method for investigating isolated tree regeneration.

[0004] A method for investigating isolated tree regeneration comprises the following steps:

[0005] Step 1: Draw rays with a single tree as the center. There are 8 rays in total, namely the east ray, southeast ray, south ray, southwest ray, west ray, northwest ray, north ray and northeast ray;

[0006] Step 2: Draw concentric circles with the tree trunk as the center, and then draw concentric circles from the inside to the outside. The intersection of the concentric circles and the rays is the center point of the first square.

[0007] Step three, draw two parallel lines on both sides of each ray, the intersection of the parallel lines and the concentric circles is the center point of the second sample plot, the sample plots on both sides of the ray are two repetitions of the sample plot on the ray, and the parallel lines in the two rays intersect at one point. The next concentric circle outside this intersection and the intersection of the two parallel lines are used as the starting point for repeated investigations. No repeated investigations are conducted within the intersection point. The investigation ends when no renewed seedlings appear in the survey sample plot, and the investigation ends when three consecutive sample circles are reached, and the investigation of isolated trees ends; the intersection point of the ray and the concentric circle is the center point of the sample plot, with the ray as a diagonal line, and the other line perpendicular to the ray and passing through the center point as the other diagonal line. Calculate the intersection point of the square with a side length of 2m, and connect them to form the survey sample plot.

[0008] Preferably, in step 2, the first concentric circle is 2 meters away from the drip line of the tree crown, and the second concentric circle is 5 meters away from the first concentric circle.

[0009] Preferably, in step three, two parallel lines are drawn on both sides of each ray, 5 m away from the ray, and the intersection of the parallel lines and the concentric circles is the center point of the second sample plot.

[0010] Preferably, the method for determining the repeated sample plot is as follows: the center point of the sample plot on the ray is translated along the arc until it coincides with the intersection point of the line parallel to the ray and the concentric circle, and the square is the repeated sample plot.

[0011] Preferably, the regeneration method within the sample plot is: investigating the number, forest age, plant height, geographical conditions, vegetation environment, herbaceous cover, abundance, density, frequency and biomass of the regeneration seedlings within the sample plot.

[0012] The present invention does not have a unified method for investigating isolated tree renewal. A group of methods are designed when investigating isolated tree renewal. Through the methods of the present application, the data investigated can truly reflect the number of isolated tree renewal seedlings, growth conditions and movement direction of forest seeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the isolated tree survey sample line;

[0014] In the figure: north ray a, northeast ray b, east ray c, southeast ray d, south ray e, southwest ray f, west ray g, northwest ray h, tree trunk 1, concentric circles 2, drip line 3, center point of the first sample square 4, parallel line 5, center point of the second sample square 6. DETAILED DESCRIPTION

[0015] In order to make the technical solution of the present invention easier to understand, the technical solution of the present invention is now clearly and completely described in the form of specific embodiments in conjunction with the accompanying drawings.

[0016] Please also see Figure 1 , the isolated tree investigation method comprises the following steps:

[0017] Step 1: With a solitary tree as the center, draw rays, namely north ray a, northeast ray b, east ray c, southeast ray d, south ray e, southwest ray f, west ray g and northwest ray h, a total of 8 directional rays;

[0018] Step 2: Draw concentric circles 2 with the tree trunk 1 as the center. The distance between the first concentric circle and the drip line 3 is 2 meters, and the distance between the second concentric circle and the first concentric circle is 5 meters. Draw concentric circles from the inside to the outside in sequence. The intersection of the concentric circles and the rays is the center point 4 of the first square.

[0019] Step three, draw two parallel lines 5 on both sides of each ray of the north ray a, northeast ray b, east ray c, southeast ray d, south ray e, southwest ray f, west ray g and northwest ray h, 5m away from the ray, the intersection of the parallel line 5 and the concentric circle 2 is the center point 6 of the second sample plot, the sample plots on both sides of the ray are two repetitions of the sample plot on the ray, and the parallel lines in the two rays intersect at one point. The intersection of the next concentric circle 2 outside this intersection and the two parallel lines 5 is used as the starting point for repeated investigation. No repeated investigation is done within the intersection point. The investigation ends when no renewed seedlings appear in the survey sample plot, and the investigation ends when three consecutive sample circles are reached, and the investigation of isolated trees ends; the intersection point of the ray and the concentric circle is the center point of the sample plot, with the ray as a diagonal line, and the other line perpendicular to the ray and passing through the center point as the other diagonal line. Calculate the intersection point of the square with a side length of 2m, and connect them to form the survey sample plot.

[0020] Method for determining repeated sample plots: translate the center point of the sample plot on the ray along the arc until it coincides with the intersection of the line parallel to the ray and the concentric circles. The square is then a repeated sample plot.

[0021] Regeneration method within the sample plot: Investigate the number, forest age, plant height, geographical conditions, vegetation environment, herbaceous cover, abundance, density, frequency and biomass of the renewed seedlings within the sample plot.

[0022] This application does not have a unified method for investigating isolated tree renewal. A group of methods are designed when investigating isolated tree renewal. Through the methods of this application, the data investigated can truly reflect the number of isolated tree renewal seedlings, growth conditions and movement direction of forest seeds.

[0023] It should be noted that the embodiments described herein are only partial embodiments of the present invention, rather than all implementations of the present invention, and the embodiments are only exemplary, and their role is only to provide a more intuitive and clear way to understand the content of the present invention, rather than to limit the technical solutions described in the present invention. Without departing from the concept of the present invention, all other implementation methods that can be thought of by ordinary technicians in this field without creative work, and other simple replacements and various changes to the technical solutions of the present invention, all belong to the protection scope of the present invention.

Claims

1. A method for investigating isolated tree regeneration, characterized in that: The isolated tree survey method includes the following steps: Step 1: Draw rays with a single tree as the center. There are 8 rays in total, namely the east ray, southeast ray, south ray, southwest ray, west ray, northwest ray, north ray and northeast ray; Step 2: Draw concentric circles with the tree trunk as the center, and then draw concentric circles from the inside to the outside. The intersection of the concentric circles and the rays is the center point of the first square. Step three, draw two parallel lines on both sides of each ray, the intersection of the parallel lines and the concentric circles is the center point of the second sample plot, the sample plots on both sides of the ray are two repetitions of the sample plot on the ray, and the parallel lines in the two rays intersect at one point. The next concentric circle outside this intersection and the intersection of the two parallel lines are used as the starting point for repeated investigations. No repeated investigations are conducted within the intersection point. The investigation ends when no renewed seedlings appear in the survey sample plot, and the investigation ends when there are three consecutive concentric circles, and the investigation of isolated trees ends; the intersection point of the ray and the concentric circle is the center point of the sample plot, with the ray as a diagonal line, and the other line perpendicular to the ray and passing through the center point as the other diagonal line. Calculate the intersection point of the square with a side length of 2m, and connect them to form the survey sample plot.

2. The isolated tree regeneration survey method according to claim 1, characterized in that: In step 2, the first concentric circle is 2 meters within the drip line of the tree crown, and the second concentric circle is 5 meters from the first concentric circle.

3. The isolated tree regeneration survey method according to claim 1, characterized in that: In step three, draw two parallel lines on both sides of each ray, 5m away from the ray. The intersection of the parallel lines and the concentric circles is the center point of the second sample plot.

4. The isolated tree regeneration survey method according to claim 1, characterized in that: Method for determining repeated sample plots: translate the center point of the sample plot on the ray along the arc until it coincides with the intersection of the line parallel to the ray and the concentric circles. The square is then a repeated sample plot.

5. The isolated tree regeneration survey method according to claim 1, characterized in that: Regeneration method within the sample plot: Investigate the number, forest age, plant height, geographical conditions, vegetation environment, herbaceous cover, abundance, density, frequency and biomass of the renewed seedlings within the sample plot.

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