Quantification of overnight movement of birch (Betula pendula) branches and foliage with short interval terrestrial laser scanning

Frontiers in Plant Science

András eZlinsky¹  Eetu ePuttonen²  Martin ePfennigbauer⁵  Christian eBriese⁶  Norbert ePfeifer⁶  Martin eWieser⁶  Gottfried eMandlburger⁶ 

[1] Balaton Limnological Institute, Centre for Ecological Research, Hungarian Academy of Sciences;Centre of Excellence in Laser Scanning Research;EODC Earth Observation Data Centre for Water Resources Monitoring GmbH;National Land Survey of Finland;RIEGL Laser Measurement Systems GmbH;Technische Universität Wien;

关键词: Circadian Rhythm;    time series;    chronobiology;    plant movements;    terrestrial laser scanning;   

DOI  :  10.3389/fpls.2016.00222

来源: DOAJ

【 摘 要 】

The goal of the study was to determine circadian movements of silver birch (Petula Bendula) branches and foliage detected with terrestrial laser scanning (TLS). The study consisted of two geographically separate experiments conducted in Finland and in Austria. Both experiments were carried out at the same time of the year and under similar outdoor conditions. Experiments consisted of 14 (Finland) and 77 (Austria) individual laser scans taken between sunset and sunrise. The resulting point clouds were used in creating a time series of branch movements. In the Finnish data, the vertical movement of the whole tree crown was monitored due to low volumetric point density. In the Austrian data, movements of manually selected representative points on branches were monitored. The movements were monitored from dusk until morning hours in order to avoid daytime wind effects. The results indicated that height deciles of the Finnish birch crown had vertical movements between -10.0 and 5.0 cm compared to the situation at sunset. In the Austrian data, the maximum detected representative point movement was 10.0 cm. The temporal development of the movements followed a highly similar pattern in both experiments, with the maximum movements occurring about an hour and a half before (Austria) or around (Finland) sunrise. The results demonstrate the potential of terrestrial laser scanning measurements in support of chronobiology.

【 授权许可】

Unknown