CN101788283B - Measuring method of leaf area index - Google Patents
Measuring method of leaf area index Download PDFInfo
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- CN101788283B CN101788283B CN2010101369477A CN201010136947A CN101788283B CN 101788283 B CN101788283 B CN 101788283B CN 2010101369477 A CN2010101369477 A CN 2010101369477A CN 201010136947 A CN201010136947 A CN 201010136947A CN 101788283 B CN101788283 B CN 101788283B
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Abstract
The invention relates to a measuring method of leaf area index, belonging to the ecological study field. The invention solves the problems of the prior art that the leaf area index measured by LAI-2000 has low accuracy, and the harvest method for measuring the leaf area index has large labor intensity and low efficiency. The method of the invention comprises the following steps: 1. placing an LAI-2000 plant canopy analyzer 3.5 away from the edge of a leaf, measuring under the condition that the measuring time is 10:00-14:00, the light Intensity is 8000-10000Lux, the wide speed is 7-level and the air humidity is 10-90%; 2. obtaining an effective leaf area index; and 3. substituting the effective leaf area index in the following formula: leaf area index of broad-leaved forest=1.5457*effective leaf area index-0.0414 or leaf area index of coniferous forest=0.9651*effective leaf area index+0.4115, thus completing the measurement of leaf area index. The method can increase the measuring efficiency, reduce the labor intensity and increase the accuracy.
Description
Technical field
The invention belongs to the ecological study field, be specifically related to the assay method of leaf area index.
Background technology
Leaf area index (
Leaf area index) be leaf-area coefficient again, be the total area of crop leaf on the plot and the ratio of floor area.Leaf area index is one of key parameter in the ecological study, the main Instrument measurings such as LAI-2000, fisheye camera that rely on, the leaf area measuring principle of this quasi-instrument all is based on miller law and baer's law, owing to be subjected to the overlapping influence of branches and leaves, the leaf area index of measuring is compared generally on the low side with true leaf area index, be effective leaf area index, have certain error, its accuracy rate is low.It is true to adopt harvest method to measure leaf area, but labour intensity is big, and efficient is low, destroys environment, is difficult to recover.
Summary of the invention
Purpose of the present invention is low for the accuracy rate that solves LAI-2000 mensuration leaf area index, harvest method is measured leaf area index and existed labour intensity big, and efficient is low, destroys environment, the problem that is difficult to recover; And provide the assay method of leaf area index.
The assay method of broad-leaf forest leaf area index is realized by following step: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under 10:00 ~ 14:00, light intensity 8000 ~ 10000Lux, wind speed＜7 grade air humidity 10-90% condition, measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index (LAI): the leaf area index of broad-leaf forest (LAI)=1.5457 * effective leaf area index-0.0414; Promptly finished the mensuration of leaf area index; This method has improved efficiency of measurement, has reduced labour intensity, and accuracy rate increases.
The assay method of coniferous forest leaf area index is realized by following step: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under 10:00 ~ 14:00, light intensity 8000 ~ 10000Lux, wind speed＜7 grade air humidity 10% ~ 90% condition, measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index (LAI): coniferous forest leaf area index (LAI)=0.9651 * effective leaf area index+0.4115; Promptly finished the mensuration of leaf area index; This method has improved efficiency of measurement, has reduced labour intensity, and accuracy rate increases.
Embodiment
Embodiment one: the assay method of leaf area index is realized by following step in the present embodiment: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under 10:00 ~ 14:00, light intensity 8000 ~ 10000Lux, wind speed＜7 grade air humidity 10% ~ 90% condition, measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index (LAI): the leaf area index of broad-leaf forest (LAI)=1.5457 * effective leaf area index-0.0414; Promptly finished the mensuration of leaf area index.
The described method of present embodiment has improved efficiency of measurement, reduced labour intensity, and accuracy rate increases.
Embodiment two: what present embodiment and embodiment one were different is: described Measuring Time is 11:00 ~ 13:00.Other step is identical with embodiment one with parameter.
Embodiment three: what present embodiment was different with embodiment one or two is: described light intensity is 8500 ~ 9500Lux.Other step is identical with embodiment one or two with parameter.
Embodiment four: what present embodiment was different with one of embodiment one to three is: described wind speed is at 3 grades ~ 4 grades.Other step is identical with one of embodiment one to three with parameter.
Embodiment five: what present embodiment was different with one of embodiment one to four is: described air humidity is 20% ~ 60%.Other step is identical with one of embodiment one to four with parameter.
Embodiment six: the assay method of leaf area index is realized by following step in the present embodiment: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under being 3 grades ~ 4 grades and air humidity 30% ~ 50% condition, 10:00 ~ 14:00, light intensity 8500 ~ 9500Lux, wind speed measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index (LAI): the leaf area index LAI of broad-leaf forest=1.5457 * effective leaf area index-0.0414; Promptly finished the mensuration of leaf area index.
Choose 18 on sample ground within the border in Sunwu County, forest zone, the Xiaoxinanlin Mountains, Heilongjiang Province, adopt the present embodiment method to measure leaf area index LAI, the result is as shown in table 1.
Table 1: broad-leaf forest leaf area index table
As shown in Table 1, the precision of Instrument measuring is 67.2%, and the precision that the present embodiment method is measured is 89.5%.The leaf area index LAI precision of the broad-leaf forest that the present embodiment method obtains is higher, and error is 10.5%.
Embodiment seven: the assay method of leaf area index is realized by following step in the present embodiment: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under 10:00 ~ 14:00, light intensity 8000-10000Lux, wind speed＜7 grade air humidity 10-90% condition, measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index (LAI): coniferous forest leaf area index (LAI)=0.9651 * effective leaf area index+0.4115; Promptly finished the mensuration of leaf area index.
The described method of present embodiment has improved efficiency of measurement, reduced labour intensity, and accuracy rate increases.
Embodiment eight: what present embodiment and embodiment seven were different is: described Measuring Time is 10:30 ~ 12:30.Other step is identical with embodiment seven with parameter.
Embodiment nine: what present embodiment was different with embodiment seven or eight is: described light intensity 8500 ~ 9500Lux.Other step is identical with embodiment seven or eight with parameter.
Embodiment ten: what present embodiment was different with one of embodiment seven to nine is: described wind speed is 3 grades ~ 4 grades.Other step is identical with one of embodiment seven to nine with parameter.
Embodiment 11: what present embodiment was different with one of embodiment seven to ten is: described air humidity is 20% ~ 60%.Other step is identical with one of embodiment seven to ten with parameter.
Embodiment seven: the assay method of leaf area index is realized by following step in the present embodiment: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under being 3 grades ~ 4 grades and air humidity 30% ~ 50% condition, 10:30 ~ 12:30, light intensity 8500 ~ 9500Lux, wind speed measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index (LAI): coniferous forest leaf area index (LAI)=0.9651 * effective leaf area index+0.4115; Promptly finished the mensuration of leaf area index.
Cap mountain experimental forest is chosen 13 on sample ground within the border in Heilongjiang Province Northeast Forestry University, adopts the present embodiment method to measure leaf area index LAI, and the result is as shown in table 2.
Effective leaf area index of table 2 coniferous forest and true leaf area index
As shown in Table 1, the precision of Instrument measuring is 92.6%, and the precision that the present embodiment method is measured is 92.8%.The leaf area index LAI precision of the coniferous forest that the present embodiment method obtains is higher, and error is 7.2%.
Claims (10)
1. the assay method of leaf area index, the assay method that it is characterized in that leaf area index is realized by following step: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under 10:00 ~ 14:00, light intensity 8000-10000Lux, wind speed＜7 grade air humidity 10-90% condition, measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index: the leaf area index of broad-leaf forest=1.5457 * effective leaf area index-0.0414; Promptly finished the mensuration of leaf area index.
2. the assay method of leaf area index according to claim 1 is characterized in that described Measuring Time is 11:00 ~ 13:00.
3. the assay method of leaf area index according to claim 1 and 2 is characterized in that described light intensity 8500 ~ 9500Lux.
4. the assay method of leaf area index according to claim 3 is characterized in that described wind speed is at 3 grades ~ 4 grades.
5. according to the assay method of claim 1,2 or 4 described leaf area index, it is characterized in that described air humidity 20% ~ 60%.
6. the assay method of leaf area index, the assay method that it is characterized in that leaf area index is realized by following step: one, LAI-2000 plant canopy analyser is placed on apart from the edge〉3.5 m places, under 10:00 ~ 14:00, light intensity 8000-10000Lux, wind speed＜7 grade air humidity 10-90% condition, measure; Two, the data of step 1 measurement carry software by LAI-2000 plant canopy analyser and handle back output, have promptly obtained effective leaf area index; Three, effective leaf area index is brought into following formula and calculate leaf area index: coniferous forest leaf area index=0.9651 * effective leaf area index+0.4115; Promptly finished the mensuration of leaf area index.
7. the assay method of leaf area index according to claim 6 is characterized in that described Measuring Time is 10:30 ~ 12:30.
8. according to the assay method of claim 6 or 7 described leaf area index, it is characterized in that described light intensity 8500 ~ 9500Lux.
9. the assay method of leaf area index according to claim 8 is characterized in that described wind speed is at 3 grades ~ 4 grades.
10. according to the assay method of claim 6,7 or 9 described leaf area index, it is characterized in that described air humidity 20% ~ 60%.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102538717B (en) * | 2010-12-30 | 2016-05-25 | 北京师范大学 | Automatic leaf area index observation system and method thereof |
| CN102706293B (en) * | 2012-06-27 | 2014-10-15 | 黑龙江工程学院 | Four-component optical physical model based inversion method of leaf area index |
| CN103766145B (en) * | 2014-02-25 | 2015-03-25 | 山东棉花研究中心 | Rapid indentifying method for disleaving effect before cotton harvesting |
| CN103983230B (en) * | 2014-05-29 | 2016-09-07 | 福州大学 | A kind of ground leaf area index measures verification method indirectly |
| CN107907074A (en) * | 2017-10-19 | 2018-04-13 | 华南农业大学 | A kind of overlapping leaf area index detection device of tea tree based on spectral reflectance and method |
| CN116297243B (en) * | 2023-02-28 | 2024-02-02 | 北京市农林科学院信息技术研究中心 | Method and device for estimating dressing amount of flue-cured tobacco nitrogenous fertilizer, electronic equipment and storage medium |
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| CN1651861A (en) * | 2005-03-11 | 2005-08-10 | 中国科学院沈阳应用生态研究所 | Method for measuring blade of broadleaf plant |
| CN101319897A (en) * | 2007-06-06 | 2008-12-10 | 中国科学院沈阳应用生态研究所 | Method for measuring area and shape of forest gap |
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Patent Citations (2)
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|---|---|---|---|---|
| CN1651861A (en) * | 2005-03-11 | 2005-08-10 | 中国科学院沈阳应用生态研究所 | Method for measuring blade of broadleaf plant |
| CN101319897A (en) * | 2007-06-06 | 2008-12-10 | 中国科学院沈阳应用生态研究所 | Method for measuring area and shape of forest gap |
Non-Patent Citations (2)
| Title |
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