Your search for keyword(s) "age structure" resulted in 2 record(s).

Title: Differing influences of natural and artificial disturbances on riparian cottonwoods from prairie to mountain ecoregions in Alberta, Canada: Journal: Journal of Biogeography; Authors: G. M. Samuelson, and S. B. Rood; Date: 2004; Summary: To investigate plant adaptations along riparian areas across ecoregions in southwestern Alberta, the influences of natural disturbance (flooding) and artificial disturbance (cattle grazing) were measured on black cottonwood (Populus balsamifera trichocarpa). Age structure, percent cover, DBH, density of trees, saplings and seedlings were measured in July and August along two free-flowing, first order streams in three ecoregions (Montane, Parkland, Prairie). Transects were established in both moderately or heavily grazed and lightly or ungrazed areas along the entire elevat ...; Agrovoc Control Words: Riparian zones, Rangelands, Grazing Land; View more details about this article

Title: Size-dependent herbivore attack and the demography of an arid grassland shrub: Journal: Ecology; Authors: M. A. Parker; Date: 1985; Summary: The relationship of plant size and age to herbivory and the effects of herbivory of two different insect species (grasshoppers and a root boring beetle) that feed on threadleaf snakeweed plants were examined on the Bernalillo watershed in New Mexico. These insects typically invade the southwest from May through September. Age structure and root borer damaged was measured by extraction of all threadleaf snakeweed plants (excluding seedlings) in 2, 8 x 8 m plots, canopy size (six size-classes), and presence of root borer damage were recorded. Mortality due to root boring beetle was measured by ...; Agrovoc Control Words: Weeds, Rangelands, Grasshoppers; View more details about this article