nstantaneous and historical temperature effects on a-pinene
Determination
of incoming solar radiation in major
tree species in Turkey
Author Details
OsmanYalcinYilmaz
(Corresponding author)
Surveying and Cadastre
Department, Faculty of Forestry, Istanbul University- 34473,Bahcekoy,??????
Istanbul,Turkey
e-mail: yilmazy@istanbul.edu.tr
OrhanSevgi
Soil Science and Ecology
Department, Faculty of Forestry, Istanbul University- 34473, Bahcekoy,
Istanbul,Turkey
AyhanKoc
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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