The tenth IMSC, Beijing, China, 2007 - International Meetings on ...

Drought and its ecological effects in central of Gilan –south western of Caspian sea
Speaker: Ramezani Gourabi, Bahman
Ramezani Gourabi, Bahman.
Depart. of Physical Geography , Islamic Azad university Rasht branch, IRAN
bahman@iaurasht.ac.ir /bahmanr2000@yahoo.com
I compared the changing of precipitation (Drought) with growth of tree ring index (TRI) in
the cental of Gilan at a statistical period (1995-2003). <strong>The</strong> research method this paper is field
work and using from cut wood and capture of wooddisk and prapering in the laboratory and
counting of TRI yearly with comparing precipitation rate in this same time (anaual, monthly)
with correlation method. Result of this research showed that drought or deficit of rain has direct
relationship with growth tree ring index ((TRI) diameter incremeter in Popolar trees and has
prefer that with irrigation on time could will low risk of destroy.
Key words: Drought, Gilan, Popolar trees, Tree Ring Index (TRI)
A model of potential natural vegetation
Speaker: Matteo Zampieri
Matteo Zampieri
ISAC-CNR, Lecce, Itay
M.Zampieri@isac.cnr.it
P. Lionello
Univ. of Salento, Lecce, Italy
A number of vegetation dynamical models already exist, but they are affected by
uncertainties related to the high degree of parameterization of the involved processes.
Here, as an alternative, a diagnostic model of potential natural vegetation, based on
cluster analysis of high resolution datasets of observed vegetation distribution and climate, is
proposed.
<strong>The</strong> model reliability is discussed and it is showns how it can be applied for reconstructing
spontaneous vegetation distribution in areas where it has been replaced because of anthropic
action. Further, it can be coupled to climate models in order to take into account the feedback
of dynamical vegetation to the atmosphere and it can be be used to infer past climate from
paleo-vegetation datasets.
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