An Acquaintance with the Relationship between Plant Ecological Groups and the Soil Chracterestics in a Kelarabad Plain Forest(Chaloos)

In Kelarabad plain forest with an area of 59.39 ha, information and data about vegetation (herbs and bearing seedling species) were collected from 77 sample plots (20mx20m) which were then analyzed by using Bran-Blanquet combined scale and through use of TWINSPAN program. The data were classified to determine 4 ecological groups. Some physical,chemical and biological characteristics of soil, such as texture, SP, EC, TNV, %OC, N, P, K, pH, CEC, and earth worm biomass were determined. By, use of PCA analysis, the correlationship as well as distribution in each ecological group of environmental factors were determined with respect to the Ist and 2nd axes separately. It was noticed that the Ist and 4th ecological groups had the highest correlationship with the Ist axes whereas 2nd and 3rd ecological groups demonstrated the highest correlationship with the 2nd axes. pH increased from the Ist group toward the others. Each of these four groups can be identified by the following environmental factors: earth worm biomass,OC% and Sand% for the Ist group; Sand% and Silt% in the 2nd group; P and Clayo.lo in the 3rd group, K in the 4th group. So it is concluded that physical
characteristics influence the most effects on formation ofecological groups in Kelarabad plain forest.