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Title

SOIL VARIABILITY AFFECTING BY TREES ROOTING AND CANOPY COVERAGE IN HASSAN-ABAD SANANDAJ AFFORESTATION

Pages

 Start Page 57 | End Page 68

Abstract

 In this study trees crown covering and rooting effects on soil characteristic variability were studied. For this purpose, 4species include: pinus nigra, Cupressus arizonica, Fraxinus rotundifolia and Robinia pseudoucacia were selected with 43 years–aged AFFORESTATION in Hasnabad–Sanandaj 22 rectangle sample plot (900m2) were chosen and allometric trees data include: DBH, height and Crown diameter were measured then annual DBH & height increment were calculated. We computed crown covering percentage in plot after 43 years. Then 112 Auger soil samples in 0-20 and 20-40 cm depth around of selected trees were taken afterward subsequently physical and chemical soil characteristics were determined Roots separated by washing then volume, wet weight and dry weight were determined. Cooperation physical and chemical soil properties under canopy and around tree in different variation shown that after 43 years effervesce on soil characters. Finally pinus nigra introduce as the best AFFORESTATION and much compatible species.

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