Ecology of Iranian Forest

Protection aspects are important in Zagros Forest because degradation and soil erosion is an important problem in this area. Consequently, the responsible organizations use needle-leaf species for forest restoration. The object of this study was investigation effect of exotics needle-leaves plantation on soil quality and compare with natural soil forest in Garan research station in Marivan. In order to study soil conditions, 10 soil samples were collected from 0-20 cm depth of each plantation stand (P. nigra Arnold, P. eldarica Medw. and C. arizonica Greene) and the natural stand of Q. brantii Lindl. as control. In total, 40 samples were collected. The results showed that nutrients of soil decreased significantly under needle-leaved species than control treatment. The amount of pH, C, N, P and K were decreased 0.5-3, 4-20, 26-36, 47-55 and 10-22 percent respectively under needle-leaved compared with natural stand as control.