مطالعه اکوسیستمهای جنگلی غرب ایران (زاگرس) در استان ایلام

Forests of Zagros growing areas are from important Iranian biological resources. Despite human interfrences on these forest in current decades, yet Zagros forest have many environmental and ecological benefits. Obviously, performance of applied ecological research is very important toward finding unknown scientific subjects and to reclamatin, regeneration and enrichment of these forests. In order to achieve these goals, a master plan was apprived in forest and rangelands research institute. This report is one of sub projects of that master plan in Ilam province, that was done for recognition of forest aspects. Characteristics of forest and range plaqnt species, edaphic and apparent proper es in 107 square plots(500m ) and 535 quadra c microplots(2.35m ) were studied. Sampling was done in four regions whith eleva ons of 800 2400 m from sea level in 33 paralel and ver cal lines on general slope. Ver cal distance of plots in slope direc on was 100m from sea level and distances between paths were 500 1000m. Compelete soil profile descrip on in centeral parts of all plots and soil active description in all microplots were done. Sum of all plant spesies in study area were 176 plants that were belong to 42 families. Those were 159 and 17 range and forest plants, respec vely. Mean plant number per hectare, forest and tree hight, canopy volum percent, succulent percent were 182.6 plant per hectare, 5.44, 3.78, 15.9% and 40% , respec vely. Fractions of coppic and seedling regenera on were 27.9 and 25 plants per hectare, respec vely. Presence rate of Quercus branti species increased from eleva on of 900m to 1400m sea level and decreased from 1400m to 2200m sea level. Coppic plant density was higher than seedling plant density below 1500m sea level and seedling plant density abow 1600 was equal or higher than coppic plant density. Results indicated that presence of forest species was increased by increase of elevation from sea level. Generally, forest quantity and quality was developed by increasing elevation from sea level, indicated that severe destruction was due to human interference in available downward. parts.

Keywords:

جنگل ها , زاگرس , بوم سازگان ها , پوشش گیاهی , ایلام