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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Jul 2012, 33 (4)                                     Back


nstantaneous and historical temperature effects on a-pinene

Determination of incoming solar radiation in major
tree species in Turkey

 

Author Details

 

Osman Yalcin Yilmaz

(Corresponding author)

Surveying and Cadastre Department, Faculty of Forestry, Istanbul University- 34473,Bahcekoy,??????

Istanbul,Turkey

e-mail: yilmazy@istanbul.edu.tr

Orhan Sevgi

Soil Science and Ecology Department, Faculty of Forestry, Istanbul University- 34473, Bahcekoy,

Istanbul,Turkey

Ayhan Koc

Surveying andCadastre Department, Faculty of Forestry, Istanbul University - 34473, Bahcekoy,?????
Istanbul,Turkey

 

 

 

Publication Data

Paper received:

11 March 2011

 

Revised received:

20? August 2011

 

Accepted:

16 October 2011

 

Abstract

Light requirements and spatial distribution of major forest tree species in Turkey hasn?t been analyzed yet. Continuous surface solar radiation data, especially at mountainous-forested areas, are needed to put forward this relationship between forest tree species and solar radiation. To achieve this, GIS-based modeling of solar radiation is one of the methods used in rangelands to estimate continuous surface solar radiation. Therefore, mean monthly and annual total global solar radiation maps of whole Turkey were computed spatially using GRASS GIS software ?r.sun? model under clear-sky (cloudless) conditions. 147498 pure forest stand point-based data were used in the study for calculating mean global solar radiation values of all the major forest tree species of Turkey. Beech had the lowest annual mean total global solar radiation value of 1654.87 kWh m-2, whereas juniper had the highest value of 1928.89 kWh m-2. The rank order of tree species according to the mean monthly and annual total global solar radiation values, using a confidence level of p < 0.05, was as follows: Beech < Spruce < Fir species < Oak species < Scotch pine < Red pine < Cedar < Juniper.The monthly and annual solar radiation values of sites and light requirements of forest trees ranked similarly.

 

Key words

Solar radiation modeling, GIS, Forest tree species?

 

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