EVALUATION OF ORIENTAL BEECH (FAGUS ORIENTALIS L.) SITE PRODUCTIVITY USING GENERALIZED ADDITIVE MODEL (CASE STUDY: TARBIAT MODARES UNIVERSITY FOREST RESEARCH STATION)

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

AHMADI K.; ALAVI S.J.; TABARI KOUCHAKSARAEI M.

Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Iranian journal of Forest Year:2015 | Volume:7 | Issue:1 Page(s): 17-32

Download Full-Text

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Persian Verion

View:

840

Download:

Cites:

Information Journal Paper

Title

EVALUATION OF ORIENTAL BEECH (FAGUS ORIENTALIS L.) SITE PRODUCTIVITY USING GENERALIZED ADDITIVE MODEL (CASE STUDY: TARBIAT MODARES UNIVERSITY FOREST RESEARCH STATION)

Author(s)

AHMADI K. | ALAVI S.J. | TABARI KOUCHAKSARAEI M. | Issue Writer Certificate

Keywords

GENERALIZED ADDITIVE MODELQ1

GENERALIZED LINEAR MODELQ2

ORIENTAL BEECHQ2

SITE FORMQ1

SITE PRODUCTIVITYQ1

Abstract

Site productivity is a key indicator of forest ecosystem; therefore it is an important criterion for forest manager for estimating the yield, annual exploitation and growth, and choosing the most suitable tree species for sites as well. In this study SITE FORM index which is the most reliable criterion for evaluating SITE PRODUCTIVITY of mixed and uneven stands was used. A random-systematic sampling method was used to locate 43 0.1 ha circular sample plots in beech dominated forests. The height and diameter of Fagus orientalis Lipsky trees with DBH³7.5 cm within each plot was recorded along with elevation, azimuth and slope of the ground. Also, at the center of plot, soil samples from first layer (0-10 cm) were taken for analyzing several soil variables. Evaluation of SITE PRODUCTIVITY by using GENERALIZED ADDITIVE MODELs in GRASP package in R 2.9.2 software showed that 53% of variability in ORIENTAL BEECH productivity could be justified using environmental variables. Bulk density, altitude, percent of slope, percent of silt, carbon to nitrogen ratio and saturation are among the significant variables affecting the SITE FORM. By using relative importance criterion, the alone contribution showed altitude had the dominant role, but the overall contribution of the slope percent was the highest in relation to other variables. Using AIC, RMSE, R squared and adjusted R squared showed GAM performs better than GLM.

Cites

No record.

References

No record.

Cite

APA: Copy

AHMADI, K., ALAVI, S.J., & TABARI KOUCHAKSARAEI, M.. (2015). EVALUATION OF ORIENTAL BEECH (FAGUS ORIENTALIS L.) SITE PRODUCTIVITY USING GENERALIZED ADDITIVE MODEL (CASE STUDY: TARBIAT MODARES UNIVERSITY FOREST RESEARCH STATION). IRANIAN JOURNAL OF FOREST, 7(1), 17-32. SID. https://sid.ir/paper/123267/en

Vancouver: Copy

AHMADI K., ALAVI S.J., TABARI KOUCHAKSARAEI M.. EVALUATION OF ORIENTAL BEECH (FAGUS ORIENTALIS L.) SITE PRODUCTIVITY USING GENERALIZED ADDITIVE MODEL (CASE STUDY: TARBIAT MODARES UNIVERSITY FOREST RESEARCH STATION). IRANIAN JOURNAL OF FOREST[Internet]. 2015;7(1):17-32. Available from: https://sid.ir/paper/123267/en

IEEE: Copy

K. AHMADI, S.J. ALAVI, and M. TABARI KOUCHAKSARAEI, “EVALUATION OF ORIENTAL BEECH (FAGUS ORIENTALIS L.) SITE PRODUCTIVITY USING GENERALIZED ADDITIVE MODEL (CASE STUDY: TARBIAT MODARES UNIVERSITY FOREST RESEARCH STATION),” IRANIAN JOURNAL OF FOREST, vol. 7, no. 1, pp. 17–32, 2015, [Online]. Available: https://sid.ir/paper/123267/en

Related Journal Papers