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Full-Text Articles in Forest Sciences
Spruce Budworm Defoliation Dynamics And Its Influence On The Acadian Forest, Cen Chen
Spruce Budworm Defoliation Dynamics And Its Influence On The Acadian Forest, Cen Chen
Electronic Theses and Dissertations
Spruce budworm (SBW; Choristoneura fumiferana (Clem.)) is the primary forest defoliator in North America. SBW defoliation has affected tens of millions ha of forests during its periodic outbreaks and caused severe growth reduction and mortality of spruce-fir (Picea-Abies) species. Evaluating these damaging effects of SBW defoliation requires understandings of the variation and dynamics of defoliation, as well as trees' variable responses to defoliation in consideration of various tree- stand-, and site-level factors. In this dissertation, we developed statistical models to 1) evaluate influences of SBW defoliation on spruce-fir stand dynamics of annual volume net growth, mortality, …
Detecting Balsam Woolly Adelgid Infestations Using Tree Rings, Morgan Lane Leef
Detecting Balsam Woolly Adelgid Infestations Using Tree Rings, Morgan Lane Leef
Graduate Theses, Dissertations, and Problem Reports
Balsam woolly adelgid (BWA), Adelges piceae(Ratzeburg), is a sap-sucking, exotic invasive insect that arrived in North America from central Europe around 1900. Since then, its range has expanded from New Brunswick, Canada to the southern Appalachian Mountains. It is a threat to all North American true-fir species, but populations can be controlled by cold continental winters. Adelgid feeding leaves noticeable traces on the wood tissue (“rotholz”) and causes a temporary positive radial growth response among affected trees. The purpose of this research was to determine dates of initial outbreaks, balsam fir radial growth change during outbreaks, and the relationship …