Abstract Resin is a renewable forest resource that can increase the economic value of some forests in rural areas. production associated with climatic conditions. However, its impact on trees’ growth remains unclear. Here, we studied radial six Portuguese Pinus pinaster had been resin tapped for 5–7 years along latitudinal and gradient to understand whether tapping affects tree growth, how it a...

Wildfire severity and subsequent ecological effects may be influenced by prior land management, via modification of forest structure and lingering changes in fuels. In 2002, the Hayman wildfire burned as a low to moderate-severity surface fire through a 21-year pine regeneration experiment with two overstory harvest cuttings (shelterwood, seed-tree) and two site preparations (scarified, unscari...

Anatomical changes of exposed tree roots are valuable tools to date erosion events, but the responses of diverse species under different types of erosion need still to be studied in detail. In this paper we analyze the histological changes that occur in roots of Scots pine (Pinus sylvestris L.) subjected to continuous denudation. A descriptive and quantitative study was conducted in the Senda S...

Studies of forest declines are important, because they both reduce timber production and affect successional trajectories of landscapes and ecosystems. Of particular interest is the decline of red pines which is characterized by expanding areas of dead and chlorotic trees in plantations throughout the Great Lakes Region. Here we examine the impact of two bark beetle groups, namely red turpentin...

Tree resin is a macroergic component that has not yet been used for energy purposes. The main goal of this work to determine the content spruce, pine, and larch wood components—pulp turpentine. combustion heat from each timber was determined calorimetrically. Approximately 1.0 g liquid samples applied in an adiabatic calorimeter. values tree (>38.0 MJ·kg?1) were 2.2 2.4 times higher than ble...

the paper deals with the analysis of the external factor (solar activity, volcanic eruptions) influence on tree growth at the kola peninsula, northwestern russia. pinus sylvestris l. (scots pine) tree-ring chronologies collected nearby the northern timberline (68.63n, 33.25e) include the oldest (1445-2005 ad) living pine tree found up to date in the kola peninsula. a total of 18 living trees p...

The induction of a 15 to 20 fold increase in oleoresin content of resin soaked xylem in paraquat treated pine stems raises many intriguing questions of a physiological nature. Our knowledge of stem anatomy and physiology of oleoresin formation in pines appears to exclude the possibility that resin soaking results from long range transport of oleoresin via vertical resin ducts to resin soaked ar...

Aim of the study: We tested alternative active principles to most widely used resin tapping stimulant which contains sulphuric acid. also studied effect wounding in five-year-old Pinus pinaster seedlings with a microtapping method.Area The experiment was carried out at Universidad Politécnica de Madrid Spain.Material and Methods: consisted six treatments: control (no no wounding), wound stimula...

Oleoresin produced and stored in pine tree leaves provides direct resistance to herbivores, while leaf volatile terpenes (LVT) in the resin are also powerful airborne infochemicals. Resin concentration and profile show considerable spatial and temporal phenotypic variation within and among pine populations. LVT biochemistry is known to be under genetic control, and although LVT should be plasti...