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Journal of Mountain Science

, Volume 13, Issue 9, pp 1558–1566 | Cite as

Thinning effects on walnut stem and crown diameter growth and fruiting in the walnut-fruit forests of Kyrgyzstan

  • Jean-Pierre Sorg
  • Zora Lea Urech
  • Davlet Mamadzhanov
  • Maik RehnusEmail author
Article

Abstract

The walnut-fruit forests (Juglans regia L.) in southern Kyrgyzstan are considered to be biodiversity hotspots and of considerable economic and ecological importance to local populations. The fruiting ability and stability of these forests are, however, decreasing because of infrequent silvicultural interventions and non-existent natural regeneration. Continuous inventories and walnut harvest measurements were carried out on 18 trial and control plots over the course of 13 year. Results showed that i) thinning had a positive influence on diameter at breast height (dbh) increase, ii) dbh growth and crown area increases are strongly and positively correlated, iii) large crowns enhanced the production of fruits, and iv) temperature conditions had a major influence on the production of fruits. The above-mentioned points are particularly relevant for young plantations but are also valid for relatively old plantations (> 50 years). We conclude that regular thinning substantially improves diameter growth, fruit production and ability of trees to withstand wind and snow damage in both young stands and in older walnut-fruit forests.

Keywords

Juglans regia Silviculture Orchard management Fruit harvest Nut production 

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References

  1. Alkanov DJ (1998) Forest health and forest protection measures in walnut-fruit forests of southern Kyrgyzstan. In: Blaser J, Carter J, Gilmour D (Eds.) Biodiversity and sustainable use of Kyrgyzstan’s walnut-fruit forests. IUCN and Intercooperation. pp 97–98.Google Scholar
  2. Barengo N (2001) Walnut Juglans regia L. Project Promotion of rare tree species. ETH Zurich, Bundesamt Wald Landschaft. p 8. (In German)Google Scholar
  3. Becquey J (1997) Walnut for timber production. 3rd ed. Institute for forest development. p 145. (In French)Google Scholar
  4. Beer R, Kaiser F, Schmidt K, et al. (2008) Vegetation history of the walnut forests in Kyrgyzstan (Central Asia): natural or anthropogenic origin? Quaternary Science Reviews 27: 621–632. DOI: 10.1016/j.quascirev.2007.11.012CrossRefGoogle Scholar
  5. Burnham KP, Anderson DR (2002) Model selection and multi-model inference: a practical information-theoretic approach. Springer, New York, USA. p 355.Google Scholar
  6. Charrier G, Poirier M, Bonhomme M, et al. (2013) Frost hardiness in walnut trees (Juglans regia L.): how to link physiology and modelling? Tree Physiology 33: 1229–1241. DOI: 10.1093/treephys/tpt090CrossRefGoogle Scholar
  7. Fisher B, Christopher T (2007) Poverty and biodiversity: measuring the overlap of human poverty and the biodiversity hotspots. Ecological Economy 62: 93–101. DOI: 10.1016/j.ecolecon.2006.05.020CrossRefGoogle Scholar
  8. Friedrich G, Schuricht W (1998) Nüsse und Quitten. Neumann-Verlag, Leipzig, Germany. p 144. (In German)Google Scholar
  9. Grisa E, Venglovsky BI, Sarymsakov Z, et al. (2008) Forest typology of the Kyrgyz Republic. Intercooperation, Bishkek, Kyrgyzstan. p 217.Google Scholar
  10. Hemery GE, Savill PS, Pryor SN (2005) Applications of the crown diameter–stem diameter relationship for different species of broadleaved trees. Forest Ecology and Management 215: 285–294. DOI: 10.1016/j.foreco.2005.05.016CrossRefGoogle Scholar
  11. Jalilova G (2007) Effects of different types of forest management activities on diversity of birds in the walnut fruit forests in Kyrgyzstan. University of Natural Resources and Life Sciences, Vienna, Austria. p 64.Google Scholar
  12. Johnson JB, Omland KS (2004) Model selection in ecology and evolution. Trends in Ecology and Evolution 19: 101–108. DOI: 10.1016/j.tree.2003.10.013CrossRefGoogle Scholar
  13. Leibundgut H (1978) Silviculture. Haupt, Berne, Switzerland. p 214. (In German)Google Scholar
  14. Leibundgut H. (1984) Our forest trees. Huber, Frauenfeld, Switzerland. p 168. (In German)Google Scholar
  15. Mamadjanov DK (2001) An assessment of the local and foreign varieties and forms of the walnut according to their economically valuable biological features. Silviculture and Forest Culture research in Kyrgyzstan pp. 9–15. (In Russian)Google Scholar
  16. Mamadjanov DK (2006) Study of varieties and diversity of walnut forms in Kyrgyzstan. Schweizerische Zeitschrift für Forstwesen 157: 499–506. DOI: 10.3188/szf.2006.0499CrossRefGoogle Scholar
  17. Marchino L, Ravagni S (2007) The effects of thinning in walnut pure stands. Sherwood Forests and Trees Today 139: 40–41. (In Italian)Google Scholar
  18. Matveev PN (1992) Hydrological and protective functions of walnut-fruit forests and means for their improvement. In: Kolov OV (Ed.) Walnut-fruit forests of southern Kyrgyzstan. Part 1. Ilim Publishing House and Institute of Forest and Walnut-Farming of the National Academy of Science of the Kyrgyz Republic, Bishkek, Kyrgyzstan. pp 96–150. (In Russian)Google Scholar
  19. Mayer H. (1977) Silviculture on socio-ecological basis. Fischer, Stuttgart, Germany and New York, USA. p 483. (In German)Google Scholar
  20. Mohni C, Pelleri F, Hemery GE (2009) The modern silviculture of walnut Juglans regia L: a literature review. Die Bodenkultur 60: 19–32.Google Scholar
  21. Pollegioni P, Woeste KE, Chiocchini F, et al. (2014) Landscape genetics of Persian walnut (Juglans regia L.) across its Asian range. Tree Genetic Genomes 10: 1027–1043. DOI: 10.1007/s11295-014-0740-2CrossRefGoogle Scholar
  22. Prutenskaya MD (1968) Diseases of walnut in southern Kyrgyzstan. AN Kyrgyz SSR. p 56. (In Russian)Google Scholar
  23. R Development Core Team (2013) R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria.Google Scholar
  24. Rehnus M, Sorg J-P (2010) Sustainable management of unique natural walnut-fruit forests in southern Kyrgyzstan. In: Tielkes E (Ed.) Proceeding of the Tropentag 2010 ETH Zurich, Switzerland. pp 130.Google Scholar
  25. Rehnus M, Sorg J-P, Pasinelli G (2011) Habitat selection and attributes of potential cavity trees of the white-winged woodpecker (Dendrocopos leucopterus) in the walnut-fruit forest in Kyrgyzstan. Acta Ornithologica 46: 83–95. DOI: 10.3161/000164511X589956CrossRefGoogle Scholar
  26. Rehnus M, Nazarek A, Mamadzhanov D, et al. (2013a) Walnut-fruit forests in Kyrgyzstan: High demand for firewood leads to overuse. Journal of Forest Research 24: 797–800. DOI: 10.1007/s11676-013-0367-4CrossRefGoogle Scholar
  27. Rehnus M, Mamadzhanov D, Venglovsky BI, et al. (2013b) The importance of agroforestry hay and walnut production in the walnut-fruit forests of southern Kyrgyzstan. Agroforestry System 87: 1–12. DOI: 10.1007/s10457-012-9516-6CrossRefGoogle Scholar
  28. Shepotiev FL, Chebanov VI, Obrazsov EM, et al. (1976) Program and method of selection and study of cultivars of nut crops. Central Research Institute of Forest Genetics and Selection (CIFGS), Voronez. p 36. (In Russian)Google Scholar
  29. Schmidt K (2007) Livelihoods and forest management in transition: knowledge and strategies of local people in the walnut-fruit forests of Kyrgyzstan. University of Reading, Reading, UK. p 406.Google Scholar
  30. Schmidt M (2005) Utilisation and management changes in south Kyrgystan's mountain forests. Journal of Mountain Science 2: 91–104. DOI: 10.1007/BF02918325CrossRefGoogle Scholar
  31. Schütz JP (1990) Silviculture 1. Forestry management principles. Polytechnic and university press of French-speaking Switzerland, Lausanne, Switzerland. p 243. (In French)Google Scholar
  32. Shevchenko VS (1998) Walnut selection in southern Kyrgyzstan: results and prospects. In Blaser J, Carter J, Gilmour D (Eds.) Biodiversity and sustainable use of Kyrgyzstan’s walnut-fruit forests. IUCN and Intercooperation, Berne, Switzerland. pp 141–142.Google Scholar
  33. Sorg JP, Rehnus M (2016) Research findings to conservation and multipurpose management of the unique walnut-fruit forests of southern Kyrgyzstan. In: Freedman E, Neuzil MR (Eds.) Environmental Crises in Central Asia. Routledge, New York, USA. pp 139–151.Google Scholar
  34. Venglovsky BI (2006) Bioecological peculiarities of renewal and development of walnut forests in Kyrgyzstan. National Academy of Sciences, Bishkek, Kyrgyzstan. p 170.Google Scholar
  35. Venglovsky BI, Mamadjanov DK, Sorg JP, et al. (2010) Bioecological bases for forest management of walnut forest in Kyrgyzstan and their multifunctional use. The Southern Branch of the Academy of Science of the Kyrgyz Republic, Bishkek, Kyrgyzstan. p 220.Google Scholar
  36. Winter M-B, Wolff B, Gottschling H, et al. (2009) The impact of climate on radial growth and nut production of Persian walnut (Juglans regia L.) in southern Kyrgyzstan. European Journal of Forestry Research 128: 531–542. DOI: 10.1007/s10342-009-0295-1CrossRefGoogle Scholar

Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Jean-Pierre Sorg
    • 1
  • Zora Lea Urech
    • 2
  • Davlet Mamadzhanov
    • 3
  • Maik Rehnus
    • 4
    Email author
  1. 1.Groupe de foresterie pour le développement, Department of Environmental SciencesETH ZurichZurichSwitzerland
  2. 2.HELVETAS Swiss IntercooperationBerneSwitzerland
  3. 3.Laboratory of Forest ResourcesForest Research InstituteBishkekKyrgyzstan
  4. 4.Swiss Federal Research Institute WSLBirmensdorfSwitzerland

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