A.Statistical Analysis of the Spatial Pattern ofTrees Species in Ghamisheleh Marivan Region, Iran.

The spatial patterns of trees species (Quercus libani,Quercus infectoria, Quercus bramii, Pyrus syriaca,
Crataegus pontica) in a forest in northern Marivan, Kurdistan province, Iran, were statistically analyzed.
Study ofspatial patterns oftree species has extensive applications in ecological management offorest areas.
Northern Zagross region accompanied by cold moist climate has createda spatially thick tree cover on
wetter slopes affecting the distribution of these tree covers. In this research, systematic random sampling
was employed to examine the different spatial patterns. The determination methods of the spatial patterns
includes: general procedure, distribution models (Poisson and negative binomial), and quantitative
dispersion indices. General procedure distinguished clumped distribution for tree species. Poisson
distribution model proved clumped distribution for tree's species. The negative binomial distribution using
goodness offit chi-square test showed clumped distribution for Quercus irfectoria species while the rest did
not follow this pattern. The negative binomial distribution using goodness of fit U statistic distinguished ,as
clumped the distribution of tree species. Green's and standard Morisita indices exhibited clumped
distributions for tree species. In this analysis, Green's index and negative binomial distribution model using
goodness of fit, U statistic were distinguished as suitable for assessing the arrangement of a set of data to
clumped pattern.