The quantitative structure model (QSM) contains the branch geometry and attributes of tree. AdQSM is a new, accurate, detailed tree QSM. In this paper, an automatic modeling method based on developed, low-cost technical scheme provided, so that can be freely used by more people. First, we two digital cameras to collect two-dimensional (2D) photos trees generated three-dimensional (3D) point clo...

Global warming-induced extreme climatic changes have increased the frequency of severe typhoons bringing heavy rains; this has considerably affected the stability of the forest ecosystems. Since the Taiwan 921 earthquake occurred in 21 September 1999, the mountain geology of the Island of Taiwan has become unstable and typhoon-induced floods and mudslides have changed the topography and geomorp...

Experimental evidence for limitation of net primary productivity (NPP) by nitrogen (N) or phosphorus (P) in lowland tropical forests is rare, and the results from the few existing studies have been inconclusive. To directly test if N or P limit NPP in a lowland tropical wet forest in Costa Rica, we conducted a full factorial fertilization experiment (4 treatments x 6 replicates in 30 x 30 m plo...

The endemic New Caledonian conifer Agathis ovata occurs as an emergent tree in fire-prone shrublands (maquis), and fire-sensitive rainforest. Growth, survivorship and recruitment over 5 yr were compared for populations from forest and maquis on ultramafic substrates in New Caledonia to investigate whether demographic behaviour varied in response to the strongly contrasting forest and shrubland ...

Abstract Key message This study details a methodology to automatically detect the positions of and dasometric information about individual Eucalyptus trees from point cloud acquired with portable LiDAR system. Currently, implementation laser scanners (PLS) in forest inventories is being studied, since they allow for significantly reduced field-work time costs when compared traditional inventory...

Sycamore is a valuable tree not only economically but also ecological and culturally. Even though it has vigorous regeneration system from its stump, coppice management triggered limited formal investigations. Therefore, the present study focused on finding most suitable strategy for achieving ground coverage biomass, as well developing growth yield models sycamore maples. Using series of eight...

Abstract This study has quantified basic wood density and various types of shrinkage in relation to initial spacing (or planting density) tree growth based on a 48-year-old black spruce ( Picea mariana ) trial eastern Canada. A total 139 sample trees were collected from four spacings (3086, 2500, 2066, 1372 trees/ha) for this study. Analyses variance (ANOVA) show that is the most important para...

Williamson's sapsucker (Sphyrapicus thyroideus) is a migratory woodpecker that breeds in mixed coniferous forests in western North America. In Canada, the range of this woodpecker is restricted to three small populations in southern British Columbia, precipitating a national listing as 'Endangered' in 2005, and the need to characterize critical habitat for its survival and recovery. We compared...

Oak decline and related mortality have periodically plagued upland oak-hickory forests, particularly oak species in the red oak group, across the Ozark Highlands of Missouri, Arkansas and Oklahoma since the late 1970s. Advanced tree age and periodic drought, as well as Armillaria root fungi and oak borer attack are believed to contribute to oak decline and mortality. Declining trees first show ...