نوع مقاله : مقاله پژوهشی
نویسندگان
دانشکده علوم انسانی و اجتماعی دانشگاه تبریز
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In the nature an ecological equilibrium exists between organisms and their environment. Human
being for many reasons have disturbed this equilibrium by unwise use of land and, thereby, paving
the way for altering its plant coverage. Studying the changing processes of plant coverge during the
known periods, their destructive consequences and the ways to improve it, are the main parameters
in planning and management of land use. In this research vegetation maps of Bejoshan Chai Basin
was prepared in 2 period (1993&2007) by using satellites photos, RS and GIS technique, NDVI
index of plant coverage, and detailed field researches. By comparing the two vegetation maps and
studying of their changing processes , among the two specified types and 6 classes of vegetation in
1993, it was found that one class has been completely wiped out due to reckless utilization of land,
and the other types dispersion area have been drastically decreased due to land use alteration . In all
vegetation types, coverage conditions of the range reduced one rank below and the range trend has
remained negative due to severe disturbance. Utilization of the range lands by livestock or native
animals in both periods was more than 2.5 times of the range capacity and plant coverage density
has reduced drastically. It appears that, plant coverage alterations during these periods in the studied
areas were faster than other areas with similar climates; and the human intervention was one of the
main cause for the native plant coverage destruction in the region.
کلیدواژهها [English]
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