23 research outputs found
The Influence of Recent Climate Change on Tree Height Growth Differs with Species and Spatial Environment
Tree growth has been reported to increase in response to recent global climate change in controlled and semi-controlled experiments, but few studies have reported response of tree growth to increased temperature and atmospheric carbon dioxide (CO2) concentration in natural environments. This study addresses how recent global climate change has affected height growth of trembling aspen (Populus tremuloides Michx) and black spruce (Picea mariana Mill B.S.) in their natural environments. We sampled 145 stands dominated by aspen and 82 dominated by spruce over the entire range of their distributions in British Columbia, Canada. These stands were established naturally after fire between the 19th and 20th centuries. Height growth was quantified as total heights of sampled dominant and co-dominant trees at breast-height age of 50 years. We assessed the relationships between 50-year height growth and environmental factors at both spatial and temporal scales. We also tested whether the tree growth associated with global climate change differed with spatial environment (latitude, longitude and elevation). As expected, height growth of both species was positively related to temperature variables at the regional scale and with soil moisture and nutrient availability at the local scale. While height growth of trembling aspen was not significantly related to any of the temporal variables we examined, that of black spruce increased significantly with stand establishment date, the anomaly of the average maximum summer temperature between May-August, and atmospheric CO2 concentration, but not with the Palmer Drought Severity Index. Furthermore, the increase of spruce height growth associated with recent climate change was higher in the western than in eastern part of British Columbia. This study demonstrates that the response of height growth to recent climate change, i.e., increasing temperature and atmospheric CO2 concentration, did not only differ with tree species, but also their growing spatial environment
Nutrient loaded seedlings reduce the need for field fertilization and vegetation management on boreal forest reclamation sites
Carbon storage in the Mediterranean upland shrub communities of Montesinho Natural Park, northeast of Portugal
Growth and competition among understory plants varies with reclamation soil and fertilization
Response of ground and rove beetles (Coleoptera: Carabidae, Staphylinidae) to operational oil sands mine reclamation in northeastern Alberta, a case study
Effects of edaphic conditions on site quality for Salix purpurea âHotelâ plantations across a large climatic gradient in Canada
Effects of woody debris and cover soil types on soil properties and vegetation 4â5 years after oil sands reclamation
Consistency and comparability of estimation and accounting of removal by sinks in afforestation/reforestation activities
Accounting, Annex I, Afforestation/reforestation, Consistency, Emission reduction units, Kyoto Protocol, Methodologies, Projects,