CN-121982536-A - Multi-tree configuration scheme adaptability comprehensive evaluation method

CN121982536ACN 121982536 ACN121982536 ACN 121982536ACN-121982536-A

Abstract

The application provides a multi-tree configuration scheme adaptability comprehensive evaluation method which comprises the steps of obtaining crown form data near a boundary zone through crown form scanning, recording the asymmetric growth quantity of crowns under blocky blending one by one, generating an edge effect intensity distribution map by combining the collected trunk inclination distance and inclination angle, identifying an actual coverage degree abnormal region, dynamically adjusting the coverage ratio of a blocky area and an edge area of the actual coverage degree abnormal region to obtain the length change and the edge effect intensity change trend of the adjusted boundary zone, carrying out multi-round iterative analysis on the blocky area according to the edge effect intensity change trend, obtaining the fluctuation range of the coverage ratio of the edge area in each iteration, and identifying the critical blocky area range with obviously increased edge effect intensity.

Inventors

LIN WEIMING
LAI XIAOFANG
WANG LISI
Lu Xuehuang
XU WENQI

Assignees

惠州市新格园林装饰工程有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (9)

1. The multi-tree configuration scheme adaptability comprehensive evaluation method is characterized by comprising the following steps of: acquiring crown morphology data near the boundary zone through crown morphology scanning, recording the asymmetric growth quantity of crowns under block-shaped mixing one by one, and generating an edge effect intensity distribution map by combining the acquired trunk inclination distance and inclination angle; extracting the reduction amount of unit length of the boundary zone and the coverage proportion of the edge zone according to the edge effect intensity distribution map, classifying and dividing the block areas, identifying units with too small block areas or too high coverage proportion of the edge zone by adopting a threshold value, and determining potential abnormal areas of the edge effect intensity; Acquiring the number of directions of tree individuals in the block units in the edge effect intensity abnormal region, which are affected by heterogeneous tree species, carrying out fusion analysis by combining the asymmetric growth quantity of the crown and the inclined distance of the trunk, and evaluating the actual coverage degree of the edge effect in each unit; Identifying an actual coverage degree abnormal region, and dynamically adjusting the block area and the edge region coverage ratio of the actual coverage degree abnormal region to obtain the adjusted length change of the boundary zone and the edge effect intensity change trend; According to the variation trend of the edge effect intensity, carrying out multi-round iterative analysis on the block area, obtaining the variation range of the coverage proportion of the edge area in each iteration, and identifying the critical block area range with obviously increased edge effect intensity; And determining an optimal area interval of the block area in the mixing and crossing conversion scheme through the critical block area range, continuously monitoring crown form data and trunk inclination angles of the edge effect intensity abnormal region to obtain long-term edge region coverage change data, and evaluating the dynamic adjustment requirement of the mixing and crossing scheme adaptability.
2. The method for comprehensively evaluating adaptability of multiple tree configurations according to claim 1, wherein the acquiring crown morphology data near the boundary zone by crown morphology scanning, recording the asymmetric growth of crowns under block blending one by one, and generating an edge effect intensity distribution map by combining the acquired trunk inclination distance and inclination angle, comprises: Acquiring tree position coordinates in preset ranges on two sides of a boundary zone in a blocky hybrid forest stand, acquiring canopy data of each tree through scanning equipment, identifying an outline boundary of the tree crown, measuring a horizontal offset distance of the geometric center of the tree crown relative to the base position of a trunk, and recording the horizontal offset distance as an asymmetric growth amount of the tree crown; measuring the inclination angle of a trunk of a tree with the crown asymmetric growth exceeding a preset threshold, normalizing the crown asymmetric growth and the inclination angle, and adding to obtain the edge intensity value of the single tree; dividing the boundary zone area according to the preset grid size, counting the average number of the edge intensity values of the trees in each grid unit, and generating an edge effect intensity distribution map.
3. The method for comprehensively evaluating adaptability of multiple tree configuration schemes according to claim 1, wherein extracting a reduction amount of unit length of a boundary zone and a coverage ratio of an edge zone according to the edge effect intensity distribution diagram, classifying block areas, identifying units with too small block area or too high coverage ratio of the edge zone by adopting a threshold value, and determining a potential edge effect intensity anomaly region comprises: reading the intensity value of each grid unit from the edge effect intensity distribution diagram, calculating the difference value of the intensity values between adjacent grids, identifying as an intensity mutation boundary when the difference value exceeds a preset threshold value, and counting the percentage of all grids inside the intensity mutation boundary to the total area of the block units to obtain the coverage proportion of an edge area; measuring the length change of the boundary line before and after the block mixing conversion, subtracting the total length of the boundary line after the conversion from the total length of the boundary line before the conversion, dividing the total length by the number of block units to obtain the unit length reduction amount of the boundary belt, and dividing the boundary belt into three grades of high coverage, medium coverage and low coverage according to the coverage proportion of the edge area; and for the risk unit, calculating the ratio of the area of the risk unit to the preset minimum effective area, judging the block unit as a potential edge effect intensity abnormal area if the ratio is smaller than a first threshold or the edge area coverage ratio is larger than a second threshold, and recording the space position coordinates and the actual area value of the potential edge effect intensity abnormal area.
4. The multi-tree configuration adaptive comprehensive assessment method according to claim 3, wherein said determining potential edge effect intensity anomaly regions further comprises: Extracting the coordinate position and intensity value of each tree from the edge effect intensity distribution diagram, identifying the distance and direction angle of the crown centroid deviating from the central axis of the trunk through laser point cloud data, recording the distance and direction angle as the crown deflection direction, measuring the inclination vector formed from the trunk base to the breast diameter, acquiring the trunk inclination orientation, and judging that the tree growth is influenced by external force in the same direction when the included angle between the crown deflection direction and the trunk inclination orientation is smaller than a preset angle; Acquiring tree crown point cloud contour data of trees on two sides of a boundary zone, calculating actual crown amplitude radius, acquiring standard crown amplitude values of the same tree species in a contention-free environment from a forestry database, dividing the actual crown amplitude by the standard crown amplitude to obtain crown amplitude expansion rate, and calculating growth competition strength index according to the product of the reciprocal of the crown amplitude expansion rate and the standardized height difference of adjacent heterogeneous trees; identifying the growth direction of main branches of the tree crown from the point cloud data according to the growth competition intensity index, counting the ratio of the branch volume towards the outer side of the block unit to the branch volume towards the inner side, judging that the tree crown is limited in outward extension if the ratio is smaller than a preset threshold value, and calculating the percentage of the number of limited trees to the total number of boundary trees as the boundary limitation degree; And simulating the running track of the sun from east to west by adopting a ray tracing algorithm, calculating the shielding time periods of tree crown projections of the trees in the edge area on the trees at different distances in the block, and accumulating the ratio of the total day shielding time period to the standard illumination time period to obtain the illumination shielding coefficient.
5. The method for comprehensively evaluating adaptability of multiple tree species configuration schemes according to claim 1, wherein the step of obtaining the number of directions of tree individuals affected by heterogeneous tree species in a block-shaped unit of the edge effect intensity abnormal region, and performing fusion analysis by combining the asymmetric growth amount of the crown and the inclined distance of the trunk, and evaluating the actual coverage degree of the edge effect in each unit comprises the following steps: identifying the positions of heterogeneous tree species in the preset distance around each tree in the edge effect intensity abnormal region, calculating azimuth angles of adjacent heterogeneous tree species relative to the target tree, dividing the azimuth angles into a plurality of azimuth intervals according to the angle range, and counting the number of azimuth intervals in which the heterogeneous tree species exist to obtain the number of directions of tree individuals influenced by the heterogeneous tree species; Obtaining trees with the number of directions larger than a preset threshold, extracting the asymmetric growth quantity of crowns and the inclined distance of trunks, multiplying the asymmetric growth quantity of the crowns by a first weight coefficient, multiplying the inclined distance of the trunks by a second weight coefficient, adding the two to obtain the comprehensive influence intensity value of a single tree, and generating an influence intensity space distribution diagram according to the distribution of the comprehensive influence intensity value in a block unit; based on the influence intensity space distribution diagram, counting the number of trees with the comprehensive influence intensity value exceeding a preset intensity threshold, calculating the proportion of the trees to the total number of the trees in the block-shaped units, and judging the high coverage degree, the medium coverage degree or the low coverage degree according to the relation between the proportion and the coverage threshold to obtain the actual coverage degree evaluation result of the edge effect in each unit.
6. The method for comprehensively evaluating adaptability of multiple tree configuration schemes according to claim 5, wherein the step of determining a high coverage level, a medium coverage level or a low coverage level according to the relation between the ratio and the coverage threshold value to obtain an actual coverage level evaluation result of the edge effect in each unit comprises the steps of: And if the ratio is greater than the first coverage threshold, determining a high coverage degree, if the ratio is between the first coverage threshold and the second coverage threshold, determining a medium coverage degree, and if the ratio is less than the second coverage threshold, determining a low coverage degree.
7. The method for comprehensively evaluating adaptability of multiple tree configuration schemes according to claim 1, wherein the identifying the abnormal region of actual coverage degree, dynamically adjusting the block area and the coverage ratio of the edge region of the abnormal region of actual coverage degree, and obtaining the adjusted length change of the boundary zone and the edge effect intensity change trend, comprises: Identifying an abnormal region of the actual coverage degree, extracting a current block area value and an edge region coverage ratio of the abnormal region, calculating a difference value between the coverage ratio and a preset standard ratio, and multiplying the difference value by a preset adjustment coefficient to obtain an expansion ratio of the block area; Based on the adjusted block area, redrawing the block unit boundary and calculating the total length of a new boundary belt, and subtracting the length of the boundary belt after adjustment from the length of the boundary belt before adjustment to obtain the reduction of the length of the boundary belt; And determining the change rate of the edge effect intensity according to the percentage of the reduction amount of the length of the boundary belt to the length of the original boundary belt, updating the edge effect intensity value of each grid unit by adopting the change rate, drawing a distribution curve of the intensity value before and after adjustment along with the change of the distance, and judging the shrinkage degree of the influence range of the edge effect by comparing the gradient change of the curve before and after adjustment.
8. The multi-tree configuration scheme adaptability comprehensive evaluation method according to claim 1, wherein the step of performing multiple iterative analysis on the block areas according to the edge effect intensity variation trend to obtain the variation range of the coverage ratio of the edge area in each iteration and identify the critical block area range in which the edge effect intensity is significantly increased comprises the steps of: Setting an initial value of the block area as the current block unit area according to the edge effect intensity variation trend, setting a decreasing step length as five percent of the initial value, gradually decreasing the block area according to the decreasing step length from the initial value, calculating a corresponding edge area coverage ratio for each area value, and recording a numerical sequence of the edge area coverage ratio; calculating the difference value of the coverage ratio between two adjacent iterations based on the edge region coverage ratio value sequence, marking as a turning point when the difference value exceeds twice of the previous difference value, and extracting a block area value at the turning point; and calculating the ratio of the fluctuation amplitude between the adjacent turning points according to the fluctuation amplitude, if the ratio is larger than a preset threshold and occurs in a continuous iteration interval, judging that the block area range corresponding to the continuous interval is an area with obviously increased edge effect intensity, and determining the maximum value and the minimum value of the interval as critical block area ranges.
9. The method for comprehensively evaluating adaptability of multiple tree configuration schemes according to claim 1, wherein determining an optimal area interval of a block area in a hybrid conversion scheme through the critical block area range continuously monitors crown morphology data and trunk inclination angles of the edge effect intensity anomaly region to obtain long-term edge region coverage change data, and evaluating dynamic adjustment requirements of adaptability of the hybrid scheme comprises: Setting expansion ratio according to tree species growth characteristics through the upper and lower boundaries of the critical block area range, multiplying the expansion ratio larger than a set value by the upper boundary to obtain the upper limit of an optimal area section, multiplying the contraction ratio smaller than the set value by the lower boundary to obtain the lower limit of the optimal area section, and determining the optimal area section of the block area in the mixed-mixed conversion scheme; Aiming at the edge effect intensity abnormal region, collecting crown form point cloud data and trunk inclination angle data according to a quarter as a period, calculating a difference value of the asymmetric crown growth quantity of the current period compared with the previous period as an increment, calculating a change value of the trunk inclination angle divided by a time interval to obtain a change rate, and obtaining long-term edge region coverage change data according to the increment and the change rate in time sequence; and calculating a change trend value by adopting a moving average method based on the long-term edge area coverage change data, and dividing and adjusting the demand level according to the comparison of the trend value of the continuous period and a preset deterioration threshold value.

Description

Multi-tree configuration scheme adaptability comprehensive evaluation method Technical Field The invention relates to the technical field of information, in particular to a multi-tree configuration scheme adaptability comprehensive evaluation method. Background In the fields of forestry resource management and ecological system optimization, the research on the adaptability evaluation of the tree species mixing mode has important significance. The research not only concerns the growth quality and ecological stability of the forest stand, but also directly influences the sustainable utilization of forest resources and the protection of biodiversity. By reasonably configuring the mixing modes of different tree species, the ecological function and economic benefit of the forest land can be effectively improved, so that the method becomes the focus of attention of the current forestry science. However, when the existing blending mode assessment method faces to a complex stand environment, it is often difficult to comprehensively capture dynamic changes of the overall influence of different configuration modes on the stand. Many methods focus more on direct competition or reciprocal relationships among tree species, but neglect the specific effect of spatial layout changes on stand edge regions during the blending mode conversion process. Such neglecting results in existing deviations of the evaluation result from the actual Lin Fenbiao, especially after mode switching, the influence of the edge areas may exhibit an unexpected trend. The technical difficulty is how to accurately judge the intensity variation of the edge effect, especially the dynamic influence related to the area of the block-shaped mixed unit. Edge effects refer to trees in a stand near the junction area of different tree species that exhibit different growth characteristics than the interior area due to growth pressures or resource competition from adjacent tree species. When the hybrid mode is changed from a row shape to a block shape, the total length of the boundary zone is reduced, but if the area of the block unit is too small, all trees may be in the edge area and affected by the peripheral heterogeneous tree species. This contradiction between area size and edge coverage makes the judgment of the intensity of the edge effect extremely complex. For example, in a blocky stand with a very small area, two tree species are planted, each tree is closely adjacent to an individual of the other tree species due to the area limitation, and the growth direction of the crown or the inclination degree of the trunk is strongly interfered by surrounding trees, so that the growth state of the whole stand presents a limbed characteristic instead of an expected stable internal environment. Therefore, how to accurately identify the critical point of abnormal increase of the edge effect intensity based on the change of the area of the block unit in the mixing mode conversion becomes a key problem in the adaptability comprehensive evaluation of the current mixing scheme. Disclosure of Invention The invention provides a multi-tree configuration scheme adaptability comprehensive evaluation method, which comprises the following steps: acquiring crown morphology data near the boundary zone through crown morphology scanning, recording the asymmetric growth quantity of crowns under block-shaped mixing one by one, and generating an edge effect intensity distribution map by combining the acquired trunk inclination distance and inclination angle; extracting the reduction amount of unit length of the boundary zone and the coverage proportion of the edge zone according to the edge effect intensity distribution map, classifying and dividing the block areas, identifying units with too small block areas or too high coverage proportion of the edge zone by adopting a threshold value, and determining potential abnormal areas of the edge effect intensity; Acquiring the number of directions of tree individuals in the block units in the edge effect intensity abnormal region, which are affected by heterogeneous tree species, carrying out fusion analysis by combining the asymmetric growth quantity of the crown and the inclined distance of the trunk, and evaluating the actual coverage degree of the edge effect in each unit; Identifying an actual coverage degree abnormal region, and dynamically adjusting the block area and the edge region coverage ratio of the actual coverage degree abnormal region to obtain the adjusted length change of the boundary zone and the edge effect intensity change trend; According to the variation trend of the edge effect intensity, carrying out multi-round iterative analysis on the block area, obtaining the variation range of the coverage proportion of the edge area in each iteration, and identifying the critical block area range with obviously increased edge effect intensity; And determining an optimal area interval of the block area in the mixing and