Thesiss

This study consists of two parts, provides data on the interference between Ziziphus spina-christi, native to Saudi Arabia, and Prosopis juliflora, an introduced species. Dry leaves from both species were milled and used to prepare extracts using 0g/l, 5g/l, 20g/l, 40g/l, 60g/l,…

Black spruce (Picea mariana (Mill) B. S. P.), an evergreen conifer and tamarack (Larix laricina (Du Roi) K. Koch), a deciduous conifer, are the predominant tree species of boreal peatlands of northern Alberta, Canada. The harsh boreal environment is characterized by low nutrient…

Sexual seedling establishment in aspen is increasingly recognized as an important natural regeneration pathway for the species in the western U.S. However, information on seedling abundance as well as factors influencing aspen sexual regeneration is limited and frequently anecdo…