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13-17 May 2013
Tucson, Arizona
US/Arizona timezone
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Growth climatic response of two species from Hunza Valley of Karakorum Range, Northern Pakistan

Presented by Dr. Moinuddin AHMED on 14 May 2013 from 11:55 to 12:15
Type: Oral Presentation
Track: Climate-growth relationships


Juniperus excelsa and Picea smithiana from three sites of Hunza valley were sampled to develop chronologies. Juniperus excelsa from Morkhun showed extremely narrow rings. Ring-width measurements were detrended using the standardization method to preserve as much climatic signals as possible. EPS, SNR, and Rbar values were higher in Juniperus excelsa. To determine whether climate was the main factor to control the growth of these species of Hunza, Correlation and Response Functions Analysis were used. Picea smithiana from Chaprot did not show any correlation with temperature while Juniperus excelsa from the same site correlated negatively with May to July temperature. Picea smithiana from Chaprot showed positive correlation with precipitation in May-April whereas Juniperus excelsa have positive correlation in April. Climate correlation modeling showed that temperature and precipitation explained 39-59% variance, hence chronologies may be used for climatic reconstruction.


Location: DoubleTree
Room: Salon B

Primary authors

  • Dr. Moinuddin AHMED Federal Urdu University of Arts, Science and Technology Gulshan Iqbal Campus Karachi-Pakistan