研究目的
Investigating the applicability of using TLS intensity data to measure EWT in outdoor environments and studying the effects of leaf senescence on the accuracy of the estimation.
研究成果
TLS instruments can measure vegetation EWT, but variety-specific models may be necessary for senescent leaves. Windy conditions can limit the practicality of point-by-point EWT estimation. NIR wavelength is more effective than SWIR for leaf/wood separation in willow canopies.
研究不足
Windy conditions affected point cloud registration accuracy, making EWT estimation on a point-by-point basis impractical. Leaf senescence required variety-specific models for accurate EWT estimation. SWIR wavelength was unsuitable for leaf/wood separation in willow canopies.
1：Experimental Design and Method Selection:
Utilized TLS intensity data from Leica P20 and P40 instruments combined in a Normalized Difference Index (NDI) to measure EWT in six willow plots.
2：Sample Selection and Data Sources:
Six willow subplots of different varieties were chosen for data collection. Leaf samples were collected for biochemistry measurements.
3：List of Experimental Equipment and Materials:
Leica P20 and P40 TLS instruments, precise scale, photo scanner, Image-J
4：50i software, oven. Experimental Procedures and Operational Workflow:
Scanned plots with TLS instruments, collected and processed leaf samples for EWT measurement, aligned and processed point clouds.
5：Data Analysis Methods:
Used NDI to estimate EWT, compared estimated EWT with actual EWT of leaf samples, analyzed effects of wind and leaf senescence.
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