Bioclimatic investigation in plant formation in Alborz Mountain using ordination techniques

Establishment and growing of plant formation is challenged by severe changing of climate in nowadays. Knowing and understanding the effects of environment factor on plant communities are quite important in order to reach the sustainable development on forest and rangeland areas. Regarding of investigation of some climatic and topographic effects on plant formation, the rangeland of northern Alborz from 1600 to 3750 m from see level of Javaherdeh (Ramsar) was selected. One square meter plot was usedand plant froms, altitude and slope percentage of each plot were recorded. Precipitation and temperature line for each elevation line were obtained by rain stations. Distribution of plant formations with some environmental and climatic factors were investigated by Canonical Correspondence Analysis and cluster analysis. The results indicated that bushy trees formation prefer more humid area in elevation belt of 1600-2200 m. Forbs and grasses formations were located in next altitudinal class (2200- 2850m). Cushion formation with less water requirement and resistance to cool condition were located at upper studied elevation range. Therefore, understanding relationships of plant formation with climatic changing, can assist managers to have ecological sound management decisions.