study of forestes ecosystems kogiloyeh and boyerahmad.

For study of forest ecosystem of kohgiloah and boyer ahmad that is a pert of zagors forest. First was choosed 3vegetotion areas with mention kindof climate and forest condition. then By use transcekt with distance 500 i 1000 meter in too meter difference height was choosed A big plot with 5(AR) and 5 small plot 105 square meter at 4 geognaphy direction in this research Was investigated a bout 50macroplot and 250 micro plot atmoh parviz pass and kohva in yasuj City7 and forests around sysakht and mimandarea. Inside of plots some index include climate, soil,geoloyy Plant coveving (kind of plant specie,include tree species,low trees, grassy ,vegetation metod. Effectesof human and effect of pests and diseases).whit sampling soil (50with description Prophy and 250 from soid surface). Studed by note forms and analysis of data did by spss, and abstract of redultes are showed in fllowing some of Trees per hectar depend with height from sea level and geography directions, specialy slope Of tree and low tree at area .that prevail species was Persian qurcus or they had plant covering about 20-35pereent,their,diameter between 7-65 centimeter,height3-12meter and niorthy slope had variousmore than southy slope about tree covering and low tree sprcies and iow tree same qurcus and wild pictaua effected about 50 to80 persent fromheight ,slope of area,cut and change branches of trees and attach pests and diseases the height In ffluence on axistance of trees and low trees in the lower heiyht and the upper height Average of auumulation forest species (number per hectar)156trees, 91.45 per hectar They had plant covering about 20-35 7-65 centimrter,height3-12 meter. And northy slope had various More than southy slope about trre covering and low tree treespecies and low tree same Qurcus and wild pictaua effected about 50 to 80 percent from height,slope of avea,cut and chanye branches of trees and Attach pests and diseases. The heiyht from sea level has an important influence on existence of trees and low trees in the Lower height ,the number of trees and per annual grassy species in crease and in lower height trees species and Between topogvaphy agents and plant is chavactcises of area,is union.inth height areath The change of plant orering is influen ced by topography and climate agents –but in the lower Height and plain regions the most importawt agents of plint covewhy changes is changing of the Physically and chemically characterieses of the physically and chemically charactrieses of soot And the shortage of nitrogen and phospaores and prganic material are observed the investigation Of all plant species frowl slopeandand height shows that the height frowl dea and the direction of Slop has an important effect on the number of all plant species but the percent of slope doesnot,20 Pecies are annual and 28 plant are perannal. The geographietal direction have important role on chanyes of plant s better condition lovering in area.inthis case the northslopes and easten slopes ha The samples in the midel and valley hane better plant cover than sawples the annual pecies in the south have more and better cover than north the humid cold climate and sewni humid humid has better condition then other conditions That the area((kohva))has better tree covers.