بررسی تحمل به سطوح مختلف سایه در دو گونه چمن فصل سرد علف گندمی بیابانی (Agropyron desertorum) و گونه چمانواش بلند (arundinaceae Schreb. ‘Forager’ Festuca)

The lack of light and shadow created by the development of human artificial and shade of the trees in landscapes are the one of the main challenge facing the lawn as one of the main components of urban landscapes. In this study, the effects of different shade levels (0, 50, 70 and 90%) on the appearance and morphological characteristics of wheatgrass (Agropyron deserturumL.) and tall fescue (Festuca arundinaceae Schreb. ‘Forager’) in a completely randomized design with three replications were examined. The results of this experiment showed that, in full sunlight, the wheatgrass had higher color degree, texture, tillering, shoot and root dry weight, root to shoot weight ratio and stomatal conductance in relation to other levels of irradiances. Therefore, wheatgrass showed higher efficiency in full sunlight than other levels of shade. Tall fescue exhibited higher efficiency at 50% shade level than full sunlight because of higher color degree, tillering, root to shoot weight ratio and photosynthesis. Based on the optimal properties for ornamental applications in landscape, Tall fescue had the better performance than wheatgrass under all levels of irradiances. However, both species did not tolerate 90% (dense) shade level.