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Showing 3 results for Environmental Factors

Mohaddeseh Maghsoudi, Shahryar Saeidi Mehrvarz, Alireza Naqinezhad, Mokarram Ravanbakhsh,
Volume 2, Issue 3 (12-2015)
Abstract

Boujagh National Park, with water ecosystems including Boujagh and Kiashahr wetlands, has an area of approximately 3477.3 hectares. In order to study factors affecting the vegetation in aquatic and wet habitats, 44 releves were implemented in the region. To test the chemical properties of the available water, samples were collected from 22 releves. The results of a two-way species indicator analysis of the modified TWINSPAN suggested that four groups of plants were present in the region. The first group being floating, immersed and submerged and the third and fourth groups being mostly helophytic. The second group of plants grows in areas with sand and mud. The results of comparative DCA analysis of water factors (PH, Depth, P, N, Cl, CO3, Hco3, EC, Na, K) showed a significant correlation between the factors and plant groups and the most important factors influencing the distribution and separation of plants was found to be water depth. In addition, Boujagh and Kiashahr wetlands vegetation map, based on the plant groups, was also prepared.


Narges Vasefi, Shahriyar Saeidi Mehrvarz, Alireza Naqinezhad, Mokarram Ravanbakhsh,
Volume 3, Issue 3 (12-2016)
Abstract

This paper concerns itself with the study of sand beaches of the Boujagh National Park with an area of 3477 ha. The purposes of this study include the determination of the plant species diversity and plant groups. In ad-dition, the determination of the impact of environmental and specific variables on the presence or absence of certain species and their communities is another aim that the study follows. In order to attain those purposes, 52 plots across 6 transects of the district were used. In each plot, the materials were identified and abundance-dominance of species by using Braun-Blanquet criteria were obtained and their life forms were determined according to Raunkiaer clas-sification. To determine the plant groups, a Two-way analysis of significant modified species (Modified TWINSP-AN) was utilized. Detrended Canonical Analysis (DCA) was used to determine factors affecting plant groups. The results showed that four plant groups exist in this district: Convolvulus persicus-Crepis foetida subsp. Foetida grou-p, Argusia sibirica group, Eryngium caucasicum-Juncus acutus group and Rubus sanctus group. The first and seco-nd groups consist of higher percentages of therophytes and spread in areas where the soil contains more sand. Plants in the third and fourth groups spread in areas with stabilized sand and high percentage of silt. DCA analysis results showed that soil factors (texture, OC, Na, K, N, Ca, Mg) have significant relation with plant groups were studied. Among the plant groups, the percentage of silt and sand, species richness and life forms of therophytes and geop-hytes show significant relations. Therefore it can be concluded that these factors affect on the separation and distri-bution of plant groups.


Mina Rabie, Younes Asri, Fatemeh Sefidkon,
Volume 11, Issue 2 (8-2024)
Abstract

Abstract. Seseli olivieri (Apiaceae) is an exclusive species of the Alborz Mountains, Iran. In this research, the effect of environmental conditions on the vegetative traits and essential oil compounds of this species was investigated. For this purpose, three habitats with different heights were selected and the vegetative characteristics of this species were measured. In each habitat, soil samples and flowering branches of this species were collected and analyzed in the laboratory. The relationship between the functional traits of this species and environmental factors was determined using CA and PCA. Variance analysis of functional traits and soil parameters showed a significant difference between the three habitats. The highest values of vegetative traits were related to Tuyeh habitat. In Tange Kavard habitat, the main effective substances were Apiol and cis-Cadina-1(6),4-diene; in Enzo habitat, Apiol and Bornyl acetate; and in the Tuyeh habitat, Bornyl acetate and α-Pinene. Among the environmental factors, altitude, annual precipitation, annual temperature, minimum temperature of the coldest month, minimum absolute temperature, lime and nitrogen had the most significant correlation with the functional traits of this plant. Based on the IUCN criteria, the conservation status of this species was determined in the critically endangered.
 

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