Determination of altitude gradient effect on quantitative characteristics of forest stands (Case study: District 3 of Sangdeh forests)

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Rezaei Sangdehi S.M.; FALLAH A.; OLADI J.; LATIFI H.

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Journal: Journal of Wood and Forest Science and Technology Year:2020 | Volume:27 | Issue:1 Page(s): 1-16

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Title

Determination of altitude gradient effect on quantitative characteristics of forest stands (Case study: District 3 of Sangdeh forests)

Author(s)

Rezaei Sangdehi S.M. | FALLAH A. | OLADI J. | LATIFI H. | Issue Writer Certificate

Keywords

Above-ground biomassQ2

AltitudeQ2

DensityQ1

SangdehQ1

Spearman correlationQ1

Abstract

Background and Objectives: Estimating the biomass and carbon content of trees and the other vegetation is important, in particular in context of global warming and climate change and the determination of biomass is essential in order to influence the climate and management of natural resources. In forest areas with high altitudinal gradients, values of the quantitative characteristics of forest stands usually change. The purpose of this study was to determine the effect of altitudinal gradient on quantitative forest characteristics including number of trees per hectare, basal area, standing volume, biomass and carbon storage in District 3 of Sangdeh Forests. Materials and Methods: The area was initially divided into three altitudinal levels, with a range of 1400-1600, 1600-1800 and 1800-2000 m a. s. l. 50 circular sample plots were randomly assigned to each level, resulting in a total sampled area of 10 ares (0. 1ha) to cover each level. In each plot, species type, height and diameter at breast height were recorded for all trees with DBH > 7. 5 cm. Then, the Density of all species was determined by sampling followed by further analysis in laboratory. Then, the biomass was calculated in the sample plots based on the FAO global model and the amount of above-ground carbon storage calculated using coefficient. Results: The results showed that from the lowest Altitude to the highest the number of trees per ha is 477, 384 and 372 and the basal area is 25. 58, 29. 49 and 30. 84 m2, respectively. Also, the volume per ha were estimated to be 314. 25, 393. 98 and 424. 75 silve, respectively. The results of this research showed the amount of biomass for all three altitudinal levels based on gradient increase is 406. 68, 478. 26 and 522. 30 t ha-1 and carbon stock is 203. 34, 239. 12 and 261. 15 ton per hectare, respectively, that shows an upward trend as the a. s. l. increases. The analysis of variance indicated a significant difference between the Altitude and the characteristics (P<0. 05). In addition, Spearman correlation showed that there was a significant correlation between Altitude and tree characteristics including basal area, standing volume and Above-ground biomass (AGB) per ha (P<0. 01). Conclusion: Conclusively, the results of this research in the study area show that changes in Altitude from the sea level have caused changes in some of the quantitative characteristics of forest stands and thus the elevation gradient has been effective on the distribution of AGB, so that with increasing a. s. l, the amount of AGB has also increased and AGB has the highest correlation with the Altitude from the sea level.

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APA: Copy

Rezaei Sangdehi, S.M., FALLAH, A., OLADI, J., & LATIFI, H.. (2020). Determination of altitude gradient effect on quantitative characteristics of forest stands (Case study: District 3 of Sangdeh forests). JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 27(1 ), 1-16. SID. https://sid.ir/paper/367601/en

Vancouver: Copy

Rezaei Sangdehi S.M., FALLAH A., OLADI J., LATIFI H.. Determination of altitude gradient effect on quantitative characteristics of forest stands (Case study: District 3 of Sangdeh forests). JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2020;27(1 ):1-16. Available from: https://sid.ir/paper/367601/en

IEEE: Copy

S.M. Rezaei Sangdehi, A. FALLAH, J. OLADI, and H. LATIFI, “Determination of altitude gradient effect on quantitative characteristics of forest stands (Case study: District 3 of Sangdeh forests),” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 27, no. 1 , pp. 1–16, 2020, [Online]. Available: https://sid.ir/paper/367601/en

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