SNOW DAMAGES IN RELATED TO PHYSIOGRAPHIC FACTORS IN ASALEM-NAV FORESTS, GUILAN PROVINCE

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TAVANKAR F.; BONYAD A.ESLAM

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Journal: Journal of Wood and Forest Science and Technology Year:2015 | Volume:22 | Issue:2 Page(s): 95-117

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Title

SNOW DAMAGES IN RELATED TO PHYSIOGRAPHIC FACTORS IN ASALEM-NAV FORESTS, GUILAN PROVINCE

Author(s)

TAVANKAR F. | BONYAD A.ESLAM | Issue Writer Certificate

Keywords

SNOW DAMAGEQ2

GROUND SLOPEQ2

SILVICULTUREQ2

ASALEM NAV FORESTQ2

Abstract

Background and objectives: SNOW DAMAGE is a significant and serious problem in managing of mountain forests. Extensive researches on SNOW DAMAGE have not been down in Iranian natural forests. The main objective of this was to estimation of frequency and intensity of SNOW DAMAGEs on trees in relation with physiographical characteristics (slope and aspect) in Asale-Nav mountain forests in Guilan province.Material and methods: Frequency of different types of SNOW DAMAGEs on trees were studied after heavy and early snowfall in 11 Dec. 2011 in altitude of 1,350 to 1,650 m a.s.l. of Asalem-Nav forests. Frequency of damaged trees and SNOW DAMAGE types were collected through circular sample plots with each area 1000 m2 in regular distances 100 m from each other. The frequency of SNOW DAMAGE types in slopes (less and more than 50%) and ground aspects (northern and southern) were compared by non-parametric chi-square tests.Results: About 14% of trees were damaged due to snowfall. The frequency of damaged trees in slopes > 50% (18.2%) was significantly (P<0.01) more than slopes < 50% (10.5%). The frequency of damaged trees in the northern aspect (17.6%) was also significantly (P < 0.01) more than southern aspect (10.3%). The frequency of crown damage, stem breakage and bent over in slopes >50% were more than the slopes <50%. Also the frequency of bending, stem breakage and bent over trees in the northern aspect were more than the southern aspect. The frequency of SNOW DAMAGE in Fagus orientalis, dominated tree in the study area, in the slopes > 50% was more than slopes < 50% (P<0.01). The SNOW DAMAGE on tree species of Carpinus betulus, Acer velutinum and Acer cappadocicum was more in the northern slope, while the SNOW DAMAGE on tree species of Quercus castaneifolia and Alnus subcordata was more in the southern slope. The most frequency of SNOW DAMAGE was observed in trees DBH < 30 cm. The slenderness coefficient of damaged trees was greater than safe trees in all tree species.Conclusion: The SNOW DAMAGE on Asalem-Nav valuable stands is considerable. The frequency and intensity of SNOW DAMAGE on trees was related with physiographical characteristics and structure of these forests. In order to strengthening of trees against to the SNOW DAMAGE needs to adequate silvicultural operation in mountain forests.

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APA: Copy

TAVANKAR, F., & BONYAD, A.ESLAM. (2015). SNOW DAMAGES IN RELATED TO PHYSIOGRAPHIC FACTORS IN ASALEM-NAV FORESTS, GUILAN PROVINCE. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 22(2), 95-117. SID. https://sid.ir/paper/156873/en

Vancouver: Copy

TAVANKAR F., BONYAD A.ESLAM. SNOW DAMAGES IN RELATED TO PHYSIOGRAPHIC FACTORS IN ASALEM-NAV FORESTS, GUILAN PROVINCE. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2015;22(2):95-117. Available from: https://sid.ir/paper/156873/en

IEEE: Copy

F. TAVANKAR, and A.ESLAM BONYAD, “SNOW DAMAGES IN RELATED TO PHYSIOGRAPHIC FACTORS IN ASALEM-NAV FORESTS, GUILAN PROVINCE,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 22, no. 2, pp. 95–117, 2015, [Online]. Available: https://sid.ir/paper/156873/en

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