vahid Izadi Khajeloo; younes asri; jaber sharifi nayaragh
Volume 22, Issue 4 , March 2015, , Pages 721-729
Abstract
Capparis spinosa is an important plant species in the rangelands ofDashte Moghan. In the current study, the ecological characteristics of the mentioned species were investigated at three representing sites. At each site, 30 plots of 10 m2 were established along transects and systematic random sampling ...
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Capparis spinosa is an important plant species in the rangelands ofDashte Moghan. In the current study, the ecological characteristics of the mentioned species were investigated at three representing sites. At each site, 30 plots of 10 m2 were established along transects and systematic random sampling was applied. Within the plots, density, coverage, height, length of longest stem, biomass, leaf length and width, and regeneration were measured. A number of 3-5 plants were randomly selected at each site and the root length was measured. Three soil samples were also taken from the root mass depth and a few soil physico-chemical properties were measured. The data were analyzed by ANOVA in Minitab software ver.14. Results showed significant differences among the study sites for coverage and biomass at p<0.05 and density and regeneration at p<0.01. However, no significant differences were recorded for height, length of longest stem, and leaf length and width. According to the results of PCA, soil texture, rainfall, and altitude were the most important factors affecting the density, distribution, and abundance of the species studied. Capparis spinosa L. prefers deep to semi-deep soils with an EC of 2.3 ds/m and a pH of 7.9 for growth and establishment.
Kian Nadjafi–Tireh–Shabankareh; Adel Jalili; Nemat.. Khorasani; Ziba Jam zad; Uones Asri
Volume 15, Issue 2 , January 2008, , Pages 179-199
Abstract
The Genu Protected Area encompasses Kuh–e–Genu, a single and isolated mountain rising above the Persian Gulf Coastal plain. The Genu Protected Area is located in Hormozgan province, 30 km north west of BandarAbbas between latitudes (27°18′50″-27°29′16″ ...
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The Genu Protected Area encompasses Kuh–e–Genu, a single and isolated mountain rising above the Persian Gulf Coastal plain. The Genu Protected Area is located in Hormozgan province, 30 km north west of BandarAbbas between latitudes (27°18′50″-27°29′16″ N) and longitudes (55° 57′30″-56°18′4″E), at about 70 to 2347m above sea level. It covers an area of about43000 hectares. The main aim of this research is to identify relationship between plant associations and environmental factors. In this investigation the relationship between environmental factors and establishment and expansion of plant associations was carried out. The each plant association, 38 ecological factors including different soil characteristics such as soil texture, lime, saturation moisture, gypsum, acidity, electrical conductivity, soluble ions (Na+, K+, N, P, Mg2+, Ca2+, CL-, CO32-, HCO3- , SO42-) in two depth, elevation and slope of habitat were determined too. Multivariate method (Principal component analysis) was used to analyze the collected data. A matrix of vegetation and environmental factors was prepared and the ordination was done by the PCA using PC-ORD software. The results show that the measured environmental variables affected the plant association distribution pattern. The most important factors that have influenced plant associations separation are as follows: electrical conductivity, elevation, moisture saturation, organic matter, lime, K+, Na+, SO42-, Ca2+, CL-, Mg2+ and slope of habitat, respectively. The multivariate analysis expression, the effects of the complicated environmental variables on the plants in a simpler way and introduce the most important factors. As a general, each plant association depends on habitat conditions, ecological needs and tolerance shows a significant relation with environmental factors especially some soil properties.