Investigation and determining environmental factors affecting on distribution of rangeland habitats in Southeast of Sabalan
Subject Areas :
forest
behnam bahrami
1
,
ardavan ghorbani
2
1 - دانشجوی دکتری علوم مرتع دانشکده فناوری کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی
2 - دانشیار مرتعداری گروه مرتعو آبخیزداری دانشکده فناوری کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی اردبیل
Received: 2016-01-10
Accepted : 2016-05-12
Published : 2016-05-21
Keywords:
Ecological Factors,
Rangeland habitat,
Ordination,
Sabalan,
Abstract :
Abstract
Relationships between environmental factors and vegetation is an essential step in order
to recognize the effective factors on growth and establishment of species plants and identify habitats. The purpose of this study was investigation of relation between environmental factors and rangeland habitats and to determine the most important affecting factors in the segregation of rangeland habitats of Southeast Sabalan, which is located in Ardabil province. Sampling was done using random-systematic method. In this rangeland ecosystem, sampling was conducted with the selection of 45 sites in
southeast of Sabalan, and inside of each site 3 large 10 m2 plots with the distance of
40m from each other along of a 120m transect was selected. Inside of the plots, the list of the plants and canopy cover were determined. From these plots, soil samples were collected from two depths of 0-15 and 15-30 cm and the climatic characteristics such rainfall and temperature, topographic features suchas elevation, slope and aspect, soil features such texture, electrical conductivity, acidity, organic matter (C), phosphorus and potassium were measured. To determine the relationship between environmental factors and plant distribution based on each plots a multivariate analysis (ordination) was used. Ordination of plant communities based on environmental factors using Canonical Correspondence Analysis (CCA), Detrended Correspondence Analysis (DCA) and Representational Difference Analysis (RDA) methods was performed. Results indicate that on the study area, physiographic attributes (elevation and aspect) have significant effects on the distribution of rangeland habitats. The CCA results of environmental factors indicate that the first and second axes with eigen values 0.703 and 0.519 and variance 11.5 and 20 respectively justify habitat changes and environmental factors in the study area. The results of this study can be used in the management of rangeland ecosystem improvement and remidation of the Southeast Sabalan and the same areas.
References:
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