Mohammad Rezaipour; Moslem Akbarinia; Masoud Tabar Kochaksaraei
Volume 10, Issue 1 , October 2012
Abstract
Of the 49 samples taken, the relationship between surface soil factors with understory vegetation diversity was investigated (Shannon's- H/, diversity index) along with the species tree by Canonical Components Analysis (CCA). Soil samples were taken and analyzed for pH, EC, C, K, Na, Mg, N, P, clay, ...
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Of the 49 samples taken, the relationship between surface soil factors with understory vegetation diversity was investigated (Shannon's- H/, diversity index) along with the species tree by Canonical Components Analysis (CCA). Soil samples were taken and analyzed for pH, EC, C, K, Na, Mg, N, P, clay, sand, loam and organic matter. Major soil gradients of the study area were determined by Principal Component Analysis (PCA) and were used in additional analyses rather than the original factors, thus avoiding the co-linearity problem. The relationship between understoryspecies diversity with soil gradients were studied by multiple regressions and the species tree by CCA. Results showed that the relationship of soil gradients with understory diversity was best described by a unimodal curve and the species tree by a CCA graph. The most important variables were the soil gradients with understory diversity, clay percentage, silt percentage, N and Mg. Also, within the species tree were clay, silt, sand and organic matter. However, there were unexplained variations in the relationship between soil factors and understory diversity. The remaining variation could partly be explained by thecanopy cover.
Javad Mirzaei; Moslem Akbarinia; Seyed Mohsen Hosseni; Mehrdad Kohzadi
Volume 5, Issue 3 , April 2008
Abstract
The aim of this study was to assess the relationship between biodiversity and the richness of woody and ground vegetation species, soil physicochemical and physiographic characteristics of the Zagros forests. This study was conducted at Arghavan reservoir in the North of Ilam Province in Iran. For this ...
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The aim of this study was to assess the relationship between biodiversity and the richness of woody and ground vegetation species, soil physicochemical and physiographic characteristics of the Zagros forests. This study was conducted at Arghavan reservoir in the North of Ilam Province in Iran. For this study, plots with a systematic distribution across the northern (n =24), southern (n =20) and western (n =13) aspects were selected and vegetation, soil and physiographic data were measured. Results showed that, in the southern aspect, ground vegetation diversity had a negative relationship with clay and sand while it had positive correlation with silt. In the northern aspect, ground vegetation diversity had a negative correlation with elevation above sea level. In the western aspect, ground vegetation diversity had a positive correlation with CaCo3 while it had negative correlation with salinity and elevation above sea level. Results also showed that, in all the aspects, woody species only had a relationship with physical factors. These results suggest that in ecological studies for assessing the relationship between vegetation and environment, soil factors should be measured for the assessment of ground vegetation and, for woody species, physical and physiographic factors.
