عوامل موثر در استقرار چهارگونه گياه شور پسند در شمال باتلاق گاو خوني با استفاده از روش اورديناسيون

A number of halophytic species such as Salicornia europea, Halocnemum strobilaceum, Aeluropus lagopoides, and Aeluropus littoralis were found to occupy a significant portion of the total vegetation of the surrounding area at the Zayande-Roud inlet to Gavkhoony wetland. However, their ecological demands and bioenviromental factors by which vegetation community composition has been affected is not understood. A compehensive knowledge of the establishment is essential for future improvements in using the above species on salanized regions. In this paper, using the ordination method. The establishment pattern of these four species in a range of varied habitats is evaluated based on the recongition of the relative significance of habitat soil chemical properties and vegetation crown cover to the establishment of the four species. For this purpose, 48 plant measurements were taken along a transect, having more species variation in term of vegetation cover percentage. Furthermore, 48 soil samples were taken from the plot along the same transect in a one-year period in 1999. The soil samples were analysed for pH, EC, available Na, K, Ca, and Mg as well as clay, and silt contents. The ground and field vegetation data were analysed using the Principal Components Analysis (PCA), and Canonical Correspondence Analysis (CCA) to produce summary vectors (PGA axes) of both the soil chemistry and habitat vegetation structure datasets. The summary of ordination method quantifies the degree to which soil variables and species cover were related to variability in ground vegetation composition. Variation in community composition (type and percentage) was significantly related to gradient of the aforementioned soil factors. Generally, the vegetation community composition in this experiment could be considered as a key component to expand the growth and development patterns of these species to similar salinised regions.