DENDROCLIMATOLOGICAL INSIGHT INTO BLACK PINE (Pinus nigra Arnold) CLIMATE-GROWTH RELATIONS IN BELGRADE AREA Stajić, B., Janjatović, Ž., Dukić, V., Kazimirović, M., Baković, Z

Radial growth of artificially established black pine (Pinus nigra) in the area of Belgrade and its dependence on climate was studied using dendroclimatological methods. Two versions of tree-ring chronologies (standard and residual chronology) were established Dependance between tree ring chronology and climate (temperature and precipitation) was estimated by correlation and response functions INTRODUCTION

STUDIED SITE  The site is classified as Quercetum-frainetto cerris  Moderate terrain slope of 10 degrees  Soil depth is cm  Climate is moderate continental with an average temperature of 12.3 C and average yearly precipitation of mm  Altitude is 300m  Artificial established stand of black pine is 60 year old  According to yield table (Vučković М. 2008) site belong to II yield class

MATERIAL AND METHODS  From 24 dominant trees two cores from opposite sides were taken at breast height perpendicular to slope direction to avoid compression wood  Tree-rings were measured by LINTAB measurment device and TSAP program in TUCSON (decadal) file format  Triple cross-dating was performed (visualy, TSAP and COFECHA programs)  Pointer years were calculated according to Becker's method  Chronology development is performed by ARSTAN (Cook 1990) program  Data were transfered to R environment for further correlation and response function analysis using dplR (Bunn, Korpela, Biondi, Mérian, Zang) and treeclim (Zang, Biondi) libraries  Calculations and figures are made in R environment

RESULTS

Detrended and prewhitened tree-ring series common period ( ) statistics RESULTS CRNrtotrbtrwtSDEPSSNRMSAC1PC1 STD % RES % Standard and residual chronology statistics CRNXSDSKKUMSAC1 STD RES

RESULTS

DISCUSSION AND CONCLUSIONS  Black pine is a good proxy of climate signal  Investigation show that jun-july precipitations have highest correlation coefficients with standard tree-ring chronology  Value of correlation coefficient ( ) between july precipitation and standard chronology is in accordance with spatial analysis results of Levanič et.al. (2013) for this part of Balkan Peninsula.  Negative correlation coefficients between temperatures from april to august and standard tree-ring chronology is in accordance with investigation of Levanič et.al. (2014) on territory of Balkan Peninsula.  Most negative and positive pointer years are related to drought and wet years respectively in Serbia calculated by SPI (standardization precipitation index) for vegetation period (april-september).

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