CN113159977B - Dominant tree species diameter order distribution method based on growth model - Google Patents
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Abstract
The invention discloses a dominant tree species age classification method based on a growth model, which comprises the steps of firstly establishing a growth model related to the longitude and latitude, altitude, annual average air temperature, annual average rainfall, soil thickness, gradient, slope direction and slope position environmental factors of single tree by using nationwide forest class checking data, calculating a small class index, counting single tree numbers, tree species and breast diameters, dividing the breast diameters of the single tree in a sample area into four diameter steps I (5 cm-12.9 cm), II (13.0 cm-24.9 cm), III (25.0 cm-36.9 cm) and IV (> 37.0 cm), classifying the single tree in each fixed sample area according to the same tree species, and finally calculating the area occupation ratio of each tree species j in the fixed sample area in the four diameter steps I, II, III and IV by using a numerical formula, and drawing a dominant tree species age classification table based on the growth model.
Description
1. Technical field
The invention relates to a dominant tree species age distribution method based on a growth model, in particular to a dominant tree species radial order distribution method based on an environmental factor based class index, an area configuration principle and an application numerical formula.
2. Background of the art
The traditional forest management has low management efficiency due to the lack of correct understanding and application of theory, lack of system research, imperfect model establishment and the like. In recent years, with the research of forest management theory, the establishment of a class index growth model based on environmental factors and a reasonable area configuration principle enable the forest management theory to be simple, convenient, time-saving and labor-saving, and the invention is provided under the background.
3. Summary of the invention
In order to overcome the defects of imperfect establishment of a traditional forest management method model, complex technology and difficult practice, the invention provides a dominant tree species diameter order distribution method established by a class index growth model based on environmental factors.
The purpose of the invention is realized in the following way:
(1) The area S of the checking data of the fixed sample land is 666.67m 2 Accurately predicting the chest diameter growth condition of 52 dominant arbor species in China according to the longitude and latitude, altitude, annual average air temperature, annual average rainfall, soil thickness, gradient, slope direction and slope position of a fixed sample land by using a numerical formula (1)(b i Is related to other environmental factors besides annual average rainfall, x i Normalization processing of longitude and latitude, altitude, annual average air temperature, annual average rainfall, soil thickness and gradient environmental factors of dominant tree species) to calculate each fixedImpact index of the plot;
(2) The chest diameter d of the tree species in each fixed sample area is measured i Dividing according to four sections, namely I (5 cm-12.9 cm), II (13.0 cm-24.9 cm), III (25.0 cm-36.9 cm), IV #>37.0 cm), and simultaneously, when the tree species age distribution of the dominant tree based on the growth model is based, the principle that the tree species occupy the same area of the four radial steps is followed, and the numerical formula (2) is appliedCalculating the area occupation ratio of the four radial steps of I, II, III and IV;
(3) Classifying each fixed sample land single wood according to the same tree species, recording the single wood number as i (i=1, 2, …, n), the tree species as j (j=1, 2, …, m), and applying the numerical formula (3)Calculating the tree seed mixing ratio; applying the formula (4) to the tree species area according to the principle of the configuration of the mixing ratio proportion>Calculating the area occupation ratio of tree species j in the first radial step; at the same time, the formula (5) is applied>Calculating the area ratio of tree species j in the second radial step, and applying the formula (6)>Calculating the area ratio of tree species j in the third radial step, and applying the formula (7)>Calculating the area occupation ratio of tree species j in the IV-th radial step;
(4) Based on a growth model of the dominant tree species, the area occupation ratio of each tree species j in the fixed sample plot in four radial steps I, II, III and IV is counted, and a dominant tree species radial step distribution table based on the growth model is drawn (see figure 1).
The invention has the following advantages
1. The operation is simple, and the workload is small;
2. the calculation is simple and convenient, and the precision is high;
3. the estimated cost is low, and the required expenditure is low;
4. forest management can be rapidly and correctly managed reasonably;
4. detailed description of the preferred embodiments
Compared with the original forest management area configuration method, the dominant tree species diameter order distribution method based on the growth model is greatly improved and innovated in theoretical calculation, and specifically comprises the following steps:
(1) The area S of the checking data of the fixed sample land is 666.67m 2 Accurately predicting the chest diameter growth condition of 52 dominant arbor species in China according to the longitude and latitude, altitude, annual average air temperature, annual average rainfall, soil thickness, gradient, slope direction and slope position of a fixed sample land by using a numerical formula (1)(b i Is related to other environmental factors besides annual average rainfall, x i Normalization processing of longitude and latitude, altitude, annual average air temperature, annual average rainfall, soil thickness and gradient environmental factors of dominant tree species) to calculate an impact index of each fixed sample area;
(2) The chest diameter d of the tree species in each fixed sample area is measured i Dividing according to four sections, namely I (5 cm-12.9 cm), II (13.0 cm-24.9 cm), III (25.0 cm-36.9 cm), IV #>37.0 cm), and simultaneously, when the tree species age distribution of the dominant tree based on the growth model is based, the principle that the tree species occupy the same area of the four radial steps is followed, and the numerical formula (2) is appliedCalculating the area occupation ratio of the four radial steps of I, II, III and IV;
(3) Classifying each fixed sample according to the same tree species, recording the tree number as i (i=1, 2, …, n), the tree species as j (j=1, 2, …, m), and applyingDigital type (3)Calculating the tree seed mixing ratio; applying the formula (4) to the tree species area according to the principle of the configuration of the mixing ratio proportion>Calculating the area occupation ratio of tree species j in the first radial step; at the same time, the formula (5) is applied>Calculating the area ratio of tree species j in the second radial step, and applying the formula (6)>Calculating the area ratio of tree species j in the third radial step, and applying the formula (7)>Calculating the area occupation ratio of tree species j in the IV-th radial step;
(4) Based on a growth model of the dominant tree species, the area occupation ratio of each tree species j in the fixed sample plot in four radial steps I, II, III and IV is counted, and a dominant tree species radial step distribution table based on the growth model is drawn (see table 1).
Claims (1)
1. A dominant tree species diameter order distribution method based on a growth model is characterized by comprising the following steps:
(1) The checking data of the fixed sample plot is continuously checked by using national forests, and the selected area S is 666.67m 2 According to the longitude and latitude, altitude, annual average air temperature, annual average rainfall, soil thickness, gradient, slope direction and slope position of the fixed sample land, accurately predicting the chest diameter growth condition of 52 dominant arbor species in China, and applying a numerical formula (1)Calculating an impact index for each fixed pattern, wherein b i Is in addition to the annual average rainfallClose, x i The method is characterized in that the normalization treatment of longitude and latitude, altitude, annual average air temperature, annual average rainfall, soil thickness and gradient environmental factors of dominant tree species is carried out;
(2) The chest diameter d of the tree species in each fixed sample area is measured i Dividing according to four sections, wherein 5 cm-12.9 cm is I-diameter step, 13.0 cm-24.9 cm is II-diameter step, 25.0 cm-36.9 cm is III-diameter step,>37.0cm is IV diameter step; meanwhile, when the dominant tree species age distribution based on the growth model is adopted, the principle that the occupied areas of four radial tree species are equal is followed, and the numerical formula (2) is appliedCalculating the area occupation ratio of the four radial steps of I, II, III and IV;
(3) Classifying each fixed sample land single wood according to the same tree species, recording the single wood number as i, wherein i=1, 2, …, n, and the tree species as j, wherein j=1, 2, …, m, and applying the numerical formula (3)Calculating the tree seed mixing ratio; applying the formula (4) to the tree species area according to the principle of the configuration of the mixing ratio proportion>Calculating the area occupation ratio of tree species j in the first radial step; at the same time, the formula (5) is applied>Calculating the area occupation ratio of tree species j in the II-th radial step; using the formula (6)/(6)>Calculating the area occupation ratio of tree species j in the third radial step; using the formula (7)/(2)>Calculating the area occupation ratio of tree species j in the IV-th radial step;
(4) Based on a growth model of the dominant tree species, calculating the area occupation ratio of each tree species j in the fixed sample plot in four radial steps I, II, III and IV, and drawing the distribution state of the dominant tree species radial steps based on the growth model.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106171815A (en) * | 2016-07-15 | 2016-12-07 | 宁波海逸园林工程有限公司 | The method transforming East Zhejiang province seashore poor efficiency windbreak based on trees functional trait |
| CN106294990A (en) * | 2016-08-08 | 2017-01-04 | 青岛智能产业技术研究院 | Tree breast-height diameter Forecasting Methodology |
| CN107173156A (en) * | 2017-06-26 | 2017-09-19 | 南京信息工程大学 | A kind of method that utilization elm and its sylvan life skinning improve Desert Regions carbon sequestration capacity |
| CN109002621A (en) * | 2018-07-25 | 2018-12-14 | 中国林业科学研究院资源信息研究所 | A kind of mean height and diameter of a cross-section of a tree trunk 1.3 meters above the ground calculation method for taking neighborhood and geographical difference into account |
| CN110020961A (en) * | 2019-01-18 | 2019-07-16 | 北京林业大学 | Chinese main arbor species plot/bottom class's sub-index grinds the technical method built |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6598477B2 (en) * | 2001-10-31 | 2003-07-29 | Weyerhaeuser Company | Method of evaluating logs to predict warp propensity of lumber sawn from the logs |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106171815A (en) * | 2016-07-15 | 2016-12-07 | 宁波海逸园林工程有限公司 | The method transforming East Zhejiang province seashore poor efficiency windbreak based on trees functional trait |
| CN106294990A (en) * | 2016-08-08 | 2017-01-04 | 青岛智能产业技术研究院 | Tree breast-height diameter Forecasting Methodology |
| CN107173156A (en) * | 2017-06-26 | 2017-09-19 | 南京信息工程大学 | A kind of method that utilization elm and its sylvan life skinning improve Desert Regions carbon sequestration capacity |
| CN109002621A (en) * | 2018-07-25 | 2018-12-14 | 中国林业科学研究院资源信息研究所 | A kind of mean height and diameter of a cross-section of a tree trunk 1.3 meters above the ground calculation method for taking neighborhood and geographical difference into account |
| CN110020961A (en) * | 2019-01-18 | 2019-07-16 | 北京林业大学 | Chinese main arbor species plot/bottom class's sub-index grinds the technical method built |
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