Kian Nadjafi-Tireh-Shabankareh; Adel Jalili; Nemat Alah Khorasani; Ziba Jamzad; Younes Asri
Volume 19, Issue 4 , March 2013, , Pages 601-613
Abstract
Genu protected area is located in the north–west of Bandar Abbas and its summit is 2347 meters above sea level. In this study, soil seed bank was investigated in vegetation communities. Soil seed bank plays a role in the revival of vegetation after degradation. In protected areas, understanding ...
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Genu protected area is located in the north–west of Bandar Abbas and its summit is 2347 meters above sea level. In this study, soil seed bank was investigated in vegetation communities. Soil seed bank plays a role in the revival of vegetation after degradation. In protected areas, understanding of the type of soil seed bank in terms of the production capacity of persistent and non-persistent seed bank is valuable to preserve the species especially endemic and rare species. In this study, sampling of the soil seed bank was conducted before precipitation. Sampling points were selected from 50 points in both depths of 0-5 and 5-10 cm of the soil surface to determine soil seed reserves. A total of 135 samples were selected for the study of plant sociology. Trays containing the samples were placed in a greenhouse and were irrigated regularly. In this research, the potential of soil seed reserves was investigated in terms of seed persistence in soil, and according to the results, significant differences were found in terms of seed density per meter square at different depths of soil and the life form of species in different communities. Among life forms, therophytes were more abundant in the soil seed bank while tree and shrub species were scarce. Species with persistent soil seed bank was mainly annuals. From 810 samples of soil seed bank, cultivated in the greenhouse, 3934 seeds were germinated of which 2933 and 1001 seeds were related to the depths of 0-5 and 5-10 cm of soil surface, respectively. In total, the number of seeds was related to 163 species of which 44 species had persistent seed bank. Species in the sampling units of soil seed bank with at least two seeds in the depth of 5-10 cm of the soil surface were considered as species with persistent seed bank. Other species in the region which had non-persistent seed bank were more vulnerable to degradation. In other words, if the vegetation is destroyed, they will not be able to revive.
Adel Jalili; Kian Najafi Tireh Shabankareh
Volume 19, Issue 3 , December 2012, , Pages 406-420
Abstract
Due to uncontrollable natural regeneration of invasive and non-native species of Prosopis juliflora in the coastal areas in south of the country, effects of the species on soil properties under canopy cover were investigated. This study was conducted in Hormozgan province, in different sites including ...
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Due to uncontrollable natural regeneration of invasive and non-native species of Prosopis juliflora in the coastal areas in south of the country, effects of the species on soil properties under canopy cover were investigated. This study was conducted in Hormozgan province, in different sites including Bandar Abbas, Ghaleghazi, Minab and Sirik. In each region, the species were randomly selected in one hectare of land and then the soil under and outside the canopy cover were sampled from two depths, 0-15 and 15-30 cm. pH, EC, saturation percentage, soluble calcium and magnesium, chlorine, HCO3-, SO42-, potassium, organic carbon, total nitrogen and available phosphorus phosphorus were measured in laboratory. Results of this research showed that there were significant differences in some soil properties such as pH, EC, and organic carbon in depth of 0-15 centimeter. It is worth noting that changes in soil properties under canopy cover were not similar in all regions. This may be due to the establishment period of the species in different regions, habitat conditions, the occurrence of rainy and drought periods and the density and diversity of native species. Some soil properties did not differ statistically beneath and outside the canopy of this species but it seems that the trend of these changes has not been stable. It is emphasized that the role of Prosopis juliflora in connection with the change in density and diversity of natural vegetation beneath the canopy cover could not conclusively be attributed only to changes in soil.
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.
Kian Najafi Shabankareh; Mohammad Khosroshahi; Mohammad Gholampoor
Volume 15, Issue 1 , January 2008, , Pages 95-113
Abstract
Resistant species to salinity and aridity and temperature fluctuation are approximately introducer of desert. These species have particular morphology compatibling themselves to fragile and acute condition of desert area. Some species accumulate water in their tissues. Some other species decrease leaves ...
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Resistant species to salinity and aridity and temperature fluctuation are approximately introducer of desert. These species have particular morphology compatibling themselves to fragile and acute condition of desert area. Some species accumulate water in their tissues. Some other species decrease leaves area and develope their root systems to use groundwater resources and some have particular phytocynthesis systems. As a general desert species with different mechanism resist against acut climate condition and unsuitable soil properties of desert regions. Characteristics of desert species distribution area can be determined the geographical domain of desert area. In this study dominant plant types in certain grupes and some of main ecological properties were assigned and related map in GIS environment was prepared. Finally, according to public characteristics of dominant species of every plant type and accompany species, desert area was sperated. In study area 22 plant group, each consist of some plant types was recognized. The distribution area of plant groups of Zygophyllum atripolicoides, Gymnocarpos decander and Hammada salicornica is about 730132, 599941 and 53260 hectar respectively.