A Survey Of Phyto - Climatology Of Zayanderoud Basin
2006
Khodagholi, M., Ph .D. Student of Climatology of Esfahan University. | Kamaley, G.A., Member of Scientific Board of | Masoodian, S.A., Member of Scientific Board of Esfahan University. | Kaviany, M.R., Prof. of Esfahan University.
The spatial variability of 63 climatic variables considered to be of vegetative biological importance was investigated using, Factor Analysis (FA) and cluster analysis (CA). Factor analysis was used to reduce the large number of relevant variables down to a manageable number by objectively selecting new variables (Factors) which explain the greatest climatic variation across Zayanderoud basin. The FA resulted in the creation of five factors which together explain 95.95% of the variation within the selected 63 plant bioclimatic variables. The FA examination of the relationships between the factors and the original plant bioclimatic variable data set indicated that the first five factors Were related to precipitation, thermal temperature, wind speed and direct, Summer rainfall and dust days variables. These factors explain 35.1, 26.8, 17.5, 11.2 and 5.4 percent of variance respectively. The five factors were weighted by the percentage variation these explained and used as inputs to a cluster analysis program to classify the data into regions of similar bioclimatic. This produced 8 classes Agropyron spp., Bromus tomentellus, Stipa arabica, Astragalus adscendens, Daphne mucronata, Salsola spp., Zygophylum atriplicoides and Artemisia aucheri spread in 8 classes.
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