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The specific leaf area characterizes the leaf area per unit dry weight, which is affected by factors such as light, temperature, nutritional status, and leaf age, and varies from species to species. For plants with larger specific leaf area, the larger the leaf area per unit dry weight, the thinner the leaves, the lower the carbon investment per leaf area, the less carbon used to construct the protective structure, and the lower the leaf lifespan, and the lower The large leaf area facilitates the capture of more light energy and increases the likelihood that the plant will grow faster.
For the same species, in order to intercept more light, and at the same time ensure that they are not damaged by strong light, the specific leaf area of ​​the upper canopy leaf is usually lower than the lower part, and the leaves formed in the most hidden places tend to have the highest specific leaves. Area; Through comparison and determination of leaf area meters, leaves of the same species with different leaf ages, older leaves usually have more organic material deposition, higher dry matter rates, and relatively lower specific leaf area.
In the measurement of the leaf area meter, it was found that the morphological parameters (leaf length, average diameter, etc.) of the new and old leaves of Pinus elliottii were similar, and the average diameters of the new and old leaves of Masson's pine were also close to each other. In August, the shape of the leaves was almost stable. The measurement data also showed that the dry weights of leaves of different leaf ages differ greatly, indicating that there is a certain difference in dry matter accumulation between the new leaf and the old leaf. This is also the root cause of the difference in leaf area between old and new leaves. It can be inferred that there is a difference in the densities of the new and old leaves.
From a longitudinal perspective, for different ages, different types of tree leaves naturally have a different specific leaf area. For the same plant, the former will be larger than the latter in different new and old leaves, and the leaf area The analysis of leaf area size of various plants measured by the instrument can know that the area of ​​the leaf has a greater relationship with the shape and the density of the leaves.
Analysis of Leaf Area Instrument for Four Coniferous Forests
For the study of the leaf area of ​​four coniferous forest communities, the leaf area index of the stand can also be calculated based on the relationship between the biomass of various trees and the specific leaf area. The instrumentation method used for the determination of the leaf area in the field is basically the direct measurement of the leaf area meter apparatus, which brings certain convenience for a lot of research and measurement, and improves a certain measurement speed and effect.