Effect of harvest intensity on volume growth of mixed beech stands in Asalem Nav forests

Document Type : Scientific article

Authors

1 Director of Research and Innovation, Shafarood Forest Company, Rezvanshahr, I. R. Iran.

2 Professor, Faculty of Natural Resources, Department of Forestry, University of Guilan, I. R. Iran.

3 Assistant Prof., Department of Forestry, Khalkhal Branch, Islamic Azad University, Khalkhal, I. R. Iran.

Abstract

The aim of this research was analysis of the effect of harvest intensity on the volume growth of valuable beech forests in the North of Iran. For this reason, volume growth of stand trees were estimated by permanent sample plots during a 10 year period in three parcels with different harvest intensities of Low, medium, and high (6, 13.1 and 18 m3/ha, respectively), and in a protected parcel (control) in Asalem Nav mixed beech forests. Results indicated the harvest intensity had significant effect on the stand volume growth (P<0.01). Average stand volume growth in harvested parcel with medium intensity (9.3 m3/ha/yr) was significantly (P<0.01) higher than the low and high intensity harvested parcels (7.4 and 4.8 m3/ha/yr, respectively), and protected parcel (6.8 m3/ha/yr). Stand volume growth decreased by increasing primary standing volume. Harvest intensity had also significant effect (P<0.01) on volume growth of trees DBH (diameter at breast height) classes. Low DBH trees (< 25 cm) in the high intensity harvested parcel, medium DBH trees (25-50 cm) in the medium harvest intensity parcel, and high DBH trees (> 50 cm) in the low intensity harvested parcel have the highest values of volume growth. Standing volume of harvested parcels were lower than the standing volume of control parcel about 26 to 42% in the primary of period, and about 21 to 33% in the end of period.

Keywords

References

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Forest Research and Development
Volume 4, Issue 4
March 2019
Pages 533-547

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