Impact of Climatic Factors on Radial Growth in Walnut (Juglans regia L.)


  • Sina N. COSMULESCU University of Craiova, Horticulture Faculty, Department of Horticulture & Food Science, 13 A.I. Cuza Street, 200585 Craiova (RO)
  • Mariana BÎRSANU IONESCU University of Craiova, Horticulture Faculty, Doctoral School of Plant and Animal Resources Engineering, 13 A.I. Cuza Street, 200585 Craiova (RO)
  • Constantin NETOIU INCDS “Marin Dracea” Craiova, 24 George Enescu Street, Craiova (RO)



climatic factor; radial growth; walnut


Walnut is a species of high vigour, with relatively slow growth, and the size of trees grows with each year of growth. Accumulation of wood biomass, and respectively, productivity, is a resultant synthesis of physiological processes and interaction of trees with environmental factors. The authors have assessed growth characteristics of genotypes standing on their own roots in the sands area of Oltenia (Romania). In terms of tree height, it ranged from 8.53 m to 18.00 m, while trunk circumference varied between 40 cm and 229 cm, in genotypes with ages between the 16 and 44 years. Environmental factors, by influencing cambium tissue activity, cell differentiation processes, cell walls growth processes, are inducing particular characteristics of annual rings, in terms of size. The average value of growth ring was 7.09 mm, with a minimum of 3.53 mm, a maximum of 13.94 mm and variation coefficient of 40.20%. The obtained results show that climatic and edaphic factors of the culture area are influencing the trees growth and development and indicate a good adaptability of genotypes to these conditions.


Metrics Loading ...


Akca Y, Bilgen Y, Ercisli S (2015). Selection of superior persian walnut (Juglans regia L.) from seedling origin in Turkey. ACTA Scientiarum Polonorum Horticulture 14(3):103-114.

Akca Y, Ozongun S (2004). Selection of late leafing, late flowering, laterally fruitful walnut (Juglans regia L.) types in Turkey. New Zealand Journal of Crop and Horticultural Science 32(4):337-342.

Arzani K, Mansouriâ€Ardakan H, Vezvae A, Roozban MR (2008). Morphological variation among Persian walnut (Juglans regia) genotypes from central Iran. New Zealand Journal of Crop and Horticultural Science 36(3):159-168.

Bârsanu Ionescu M, Cosmulescu S (2017). Effect of climatic conditions on flowering of walnut genotypes in Romania. Jurnal of Nuts 8(2):161-167.

Botu M, Tudor M, Botu I, Cosmulescu S, Papachatzis A (2010). Evaluation of walnut cultivars in the conditions of the Oltenia’s hill area regarding functioning potential. Analele Universitatii din Craiova 15:94-103.

Carrer M, Urbinati C (2006). Long-term change in the sensitivity of tree-ring growth to climate forcing of Larix decidua. New Phytologist 170(4):861-872.

Cook ER, Kairiukstis LA (Eds.) (1990). Methods of dendrochronology. Applications in the environmental science. Kluwer, Dordrecht pp 153-162.

Cosmulescu S, Baciu A, Botu M, Achim G (2010). Environmental factors' influence on walnut flowering. Acta Horticulturae 861:83-88.

Cosmulescu S (2013). Phenotypic diversity of walnut (Juglans regia L.) in Romania - opportunity for genetic improvement. South-Western Journal of Horticulture, Biology and Environment 4(2):117-126.

Cosmulescu S, Botu M (2012). Walnut biodiversity in south-western Romania resource for perspective cultivars. Pakistan Journal of Botany 44(1):307-311.

Esper J, Neuwirth B, Treydte K (2001). A new parameter to evaluate temporal signal strength of tree ring chronologies. Dendrochronologia 19(1):93-102.

Friedrichs D, Neuwirth B, Gottschling H (2006). Dendroecological analysis of growth anomalies in walnut forests in Southern Kyrgyzstan. TRACE - Tree Rings in Archaelogy. Climatology and Ecology 4:144-150.

Fritts HC (1976). Tree Rings and Climate. Academic Press, p 567.

Owens JN (1995). Constraints to seed production: temperature and tropical trees. Tree Physiology 15(7-8):477-490.

Schweingruber FH (1983). Der Jahrring. Standort, Methodik, Zeit und Klima in der Dendrochronologie.

Schweingruber FH, Wehrli U, Aellen-Rumo K, Aellen M (1991). Weiserjahre als Zeiger extremer Standorteinflüsse. Schweizer Zeitschrift für Forstwesen 142:33-52.

Schweingruber FH (1996). Tree rings and environment. Dendroecology. Paul Haupt, Bern.

Stokes MA, Smiley TL (1968). An introduction to tree ring dating. The University of Chicago Press, Chicago.

Winter MB, Wolff B, Gottschling H, Cherubini P (2009). The impact of climate on radial growth and nut production of Persian walnut (Juglans regia L.) in Southern Kyrgyzstan. European Journal of Forest Research 128(6):531-537.




How to Cite

COSMULESCU, S. N., BÎRSANU IONESCU, M. ., & NETOIU, C. . (2019). Impact of Climatic Factors on Radial Growth in Walnut (Juglans regia L.). Notulae Scientia Biologicae, 11(2), 304–308.



Research articles
DOI: 10.15835/nsb11210492