Efficient woody oil biomass determination method

Abstract

The invention belongs to the field of forest investigation, and particularly relates to an efficient woody oil biomass measurement method, which comprises the following steps of: analyzing R / S value by adopting fallen standard wood, calculating wood volume by other nursery stocks according to a broad-leaved tree binary wood volume formula, determining biomass per unit wood volume by collecting samples, and further calculating the total biomass so as to realize the purpose of efficiently obtaining the biomass.

Description

Technical Field

[0001] The invention belongs to the field of forest survey, and in particular relates to an efficient method for measuring woody oil biomass. Background Art

[0002] The total amount or total weight of living individuals in a population is called biomass. The biomass of forest trees can be divided into above-ground parts (trunks, branches, leaves) and underground parts (root system), and is generally represented by the sum of the dry weights of each part.

[0003] The full weighing method is generally used, in which trees are felled, all trunks, branches, leaves and roots are retained, and the dry weight of the sample is obtained by drying. Although this method can ensure the accuracy of the data, it is extremely labor-intensive in large-scale forest surveys and has a devastating impact on seedlings. It is necessary to develop an efficient method for measuring woody oil biomass to reduce the workload and maintain data accuracy in forest surveys. Summary of the invention

[0004] In response to the problems raised by the background technology, the present invention studies and designs an efficient method for measuring the biomass of woody oil plants, the purpose of which is to provide a method suitable for measuring the biomass of regional seedlings, to fell standard trees to analyze the R / S value, to calculate the volume of the remaining seedlings according to the binary volume formula for broad-leaved trees, to determine the biomass per unit volume by collecting samples, and then to calculate the total biomass to achieve the goal of efficiently obtaining biomass.

[0005] The technical solution of the present invention:

[0006] An efficient method for measuring woody oil plant biomass comprises the following steps:

[0007] (1) Calculation of R / S value using standard wood: Randomly select 5 healthy woody oil seedlings without pests and diseases in the area as standard wood, cut them down and cut them into pieces, pack them into individual standard wood, dry them, and measure the biomass of the underground part (R) and the aboveground part (S) respectively, obtain the average value of the two, and further calculate the R / S value.

[0008] (2) Determination of biomass per unit volume: Cut wood blocks of standard wood per unit volume, dry them, and measure the biomass of each block. Calculate the average value as the biomass per unit volume of the seedlings of this tree species and seedling age.

[0009] (3) Calculation of single plant and regional biomass: Measure the height (H) and diameter at breast height (D) of the seedlings to be tested, calculate the volume using the volume formula, and then calculate the aboveground biomass based on the biomass per unit volume. Then calculate the underground biomass using the average R / S value, and sum them up to get the total plant biomass. The regional biomass can be obtained by summing up the biomass of all seedlings in the region.

[0010] Beneficial effects of the present invention:

[0011] (1) Ensure data accuracy: When the tree species and seedling age are fixed, although there are certain errors in the R / S value, wood volume and moisture content for individuals, they can be ignored on a large scale. Therefore, this technical solution focuses on the calculation of regional biomass.

[0012] (2) Reduce the workload of measurement: The full weighing method is more suitable for measuring the biomass of a single tree, but if all the seedlings in the area are involved, the workload will be extremely large. This technical solution only carries out the full weighing method on a few standard trees to obtain key data, and then the biomass of other seedlings can be measured, which can greatly reduce the workload.

[0013] (3) Suitable for detecting changes in seedling biomass during the growth stage: The full weighing method can only be used during the felling stage. After the measurement, the seedlings are completely destroyed. However, this technical solution can be used multiple times to continuously monitor the seedlings during the growth cycle. It can be used to find the time when the biomass value increases the most for felling, thereby maximizing economic and ecological benefits. DETAILED DESCRIPTION

[0014] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0015] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0016] Example

[0017] An efficient method for measuring woody oil plant biomass comprises the following steps:

[0018] (1) Calculation of R / S value using standard wood: Randomly select 5 healthy woody oil seedlings without pests and diseases in the area as standard wood, cut them down and cut them into pieces, pack them into individual standard wood, dry them, and measure the biomass of the underground part (R) and the aboveground part (S) respectively, obtain the average value of the two, and further calculate the R / S value.

[0019] (2) Determination of biomass per unit volume: Cut wood blocks of standard wood per unit volume, dry them, and measure the biomass of each block. Calculate the average value as the biomass per unit volume of the seedlings of this tree species and seedling age.

[0020] (3) Calculation of single plant and regional biomass: Measure the height (H) and diameter at breast height (D) of the seedlings to be tested, calculate the volume using the volume formula, and then calculate the aboveground biomass based on the biomass per unit volume. Then calculate the underground biomass using the average R / S value, and sum them up to get the total plant biomass. The regional biomass can be obtained by summing up the biomass of all seedlings in the region.

[0021] test:

[0022] Three-year-old Eucommia ulmoides seedlings were used for the experiment.

[0023] Five standard trees were collected from areas with sufficient growth space. The average aboveground biomass was 8.675 kg, the underground biomass was 2.664 kg, R / S = 3.269, and the biomass per unit volume was 2.557 g / cm 3 .

[0024] In addition, a square plot of 5*5 trees was selected to measure the tree height and DBH respectively. The binary volume formula of broad-leaved trees was used, V = 0.000057887451D 1.8445849 H 0.98088457 Calculate the timber volume, and then calculate the aboveground biomass and the biomass of the whole plant. Then cut down and dry all the trees in the sample plot, measure the actual biomass, and count them from small to large according to the square size of 2*2 plants, 3*3 plants, 4*4 plants, and 5*5 plants. The results are shown in Table 1.

[0025] Table 1 Comparison of Eucommia biomass calculated by the present invention and actual biomass

[0026] Sample size Calculated biomass (kg) Actual biomass (kg) Error rate (%) 2 plants*2 plants 43.58 37.49 16.24 3 plants*3 plants 99.85 90.90 9.85 4 plants*4 plants 177.36 166.99 6.21 5 plants*5 plants 281.16 268.47 4.73

[0027] It can be seen from the examples that the biomass calculated by the present invention is generally higher than the actual biomass, which may be caused by the fact that the growth space of the central seedling is not as expected. However, as the number of Eucommia ulmoides plants involved in the calculation increases, the error rate gradually decreases, and the calculated biomass becomes closer and closer to the actual biomass. When there are 25 plants, the error rate has been reduced to less than 5%. Compared with the full weighing method, the advantages of the present invention are shown in Table 2.

[0028] Table 2 Advantages of the present invention

[0029]

[0030] In summary, although the present invention has certain errors, the error rate is extremely low in the measurement of regional woody oil plant biomass, and it can save seedlings, manpower and materials, and has practical significance.

[0031] The basic teachings of the present invention have been described, and many extensions and variations will be apparent to those having ordinary skill in the art. Since the invention disclosed in the specification may be implemented in other specific forms without departing from the spirit or general characteristics of the invention, and some of these specific forms have been pointed out, the embodiments disclosed in the specification should be regarded as illustrative rather than limiting. The scope of the present invention is defined by the appended claims, rather than by the above description, and all changes in the equivalent meaning and scope that fall within the claims are still included within their scope.

Claims

1. An efficient method for measuring woody oil plant biomass, characterized in that: The following steps are involved: (1) Calculation of R / S value using standard wood: Randomly select 5 healthy woody oil seedlings without pests and diseases in the area as standard wood, cut them down and cut them into pieces, pack them into individual standard wood, dry them, and measure the biomass of the underground part (R) and the aboveground part (S) respectively, obtain the average value of the two, and further calculate the R / S value; (2) Biomass per unit volume: Cut wood blocks of standard wood per unit volume, dry them, measure the biomass of each block, and calculate the average value as the biomass per unit volume of the seedlings of this tree species and seedling age; (3) Calculation of single plant and regional biomass: Measure the height (H) and diameter at breast height (D) of the seedlings to be tested, calculate the volume using the volume formula, combine the results of biomass per unit volume, and then calculate the aboveground biomass. Then calculate the underground biomass using the average R / S value, and sum them up to get the biomass of the whole plant. By summing up the biomass of all seedlings in the region, we can get the regional biomass.

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