An improved tree-height measurement method for calculating net primary production in a larch forest on Mt. Yatsugatake, Japan

概要

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Observation towers in forests provide necessary data for satellite image product validation, such as net primary production and biomass. One of the key parameters in these calculations is tree height. Here we compared tree heights calculated using three different non-destructive measurement methods, using a Vertex III ultrasonic digital hypsometer in each case. Method 1 involved measuring tree height conventionally, from the ground. Methods 2 and 3 involved measuring tree height from the 4th and 5th floors, respectively, of an observation tower. Tree height measurements from the 4th floor were more stablethan those from the ground. Tree height measured from the ground was greater than that measured from the 4th floor. The 4th and 5th floor measurements showed a good relationship (r2 = 0.88). From these results, we decided to measure tree height from the 5th floor of the tower because tree tips can be seen more clearly, thus reducing measurement time, and because future measurements require only remeasuring the angle on the 5th floor, further reducing the time required to gather tree-height data. Therefore, our measurementmethod is useful for application to field surveys and observations of tree-height change.
奈良女子大学の論文
2010-03-31