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A branch with 5 or more leaves that is not obstructed by other trees and branches. The length of a section of the stem in the section of the collection data is the length of a stem, and the denominator is the number of internodes on the stem. The average stem-to-stem distance of the normal 2-3 leaves is taken from the stem. Because the leaves of these trees are basically elliptical or nearly elliptical, the leaves of these trees are approximated to facilitate the calculation of the area of ​​the leaves. Ellipsoid shape processing, taking the average of the length and width of 2-3 blades of a moderate size as the length and width of the elliptical blade. The measuring instrument uses the leaf area measuring instrument.
There are many trees whose leaves are long and narrow, and extend almost along the direction of the petiole. The distance from the point to the stem differs greatly from the point on the blade. Substituting the actual petiole length into the model will hardly reflect the leaf area and petiole length. The interrelationship between the two, thus affecting the establishment of the entire leaf area measurement model, the above model needs to be improved.
The value measured by the leaf area meter and the analysis of the general blade show that the petiole is usually long in the area, the leaf area is small, and the petiole is usually short. This is because for large blades, if the petiole is short, the adjacent blades will cluster together and block each other, so that a considerable part of many blades will not be exposed to sunlight, which is useless; for very small blades, If the petiole is very long, it is obviously a waste, because without the growth of such a long petiole, the neighboring leaves cannot be shielded from each other.
Application of leaf area measuring instrument in petiole length and area study
When the stems and leaves of the trees are properly idealized, mathematical models are used to obtain expressions and models that reflect the relationship between leaf area and petiole length, internode length, and leaf inclination. The irrationality was improved, and the improved model was tested using the actual measured leaf data of the leaf area meter. The test results showed that the model was correct and the expression of the model revealed the leaf size and petiole length of the tree. The interrelationship between internode length and leaf dip angle.