Development of portable composite lidars and applications to plant measurement

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We developed methods for estimating leaf area density (LAD), leaf area index (LAI) and leaf inclination angle of Japanese zelkova canopy using 3D portable scanning lidars. A laser beam coverage index with a good correlation with LAD estimation error was proposed. The error decreased when the index exceeded 2. We also estimated plant area density (PAD) and plant area index (PAI) of wheat canopy because it is difficult to separate leaf and stem. Based on lidar-derived plant area density, the area of each type of organ (stem and leaves, ears) per unit ground area was related to the actual dry weight of each organ type. In addition, we developed a 3D chlorophyll fluorescence imaging system and estimated spatio-temporal effects of herbicide on a whole melon plant.