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The Effect of Insect Defoliations and Seed Production on the Dynamics of Radial Growth Synchrony among Scots Pine Pinus sylvestris L. Provenances

1
Department of Silviculture and Genetics, Forest Research Institute, Braci Leśnej 3, Sękocin Stary, 05-090 Raszyn, Poland
2
Department of Ecology and Biogeography, Nicolaus Copernicus University in Toruń, Lwowska 1, 87-100 Toruń, Poland
3
Department of Forest Protection, Entomology and Forest Climatology, University of Agriculture in Kraków, 29 Listopada 46, 31-425 Kraków, Poland
4
Department of Forest Protection, Forest Research Institute, Braci Leśnej 3, Sękocin Stary, 05-090 Raszyn, Poland
*
Authors to whom correspondence should be addressed.
Forests 2019, 10(10), 934; https://doi.org/10.3390/f10100934
Received: 30 August 2019 / Revised: 15 October 2019 / Accepted: 19 October 2019 / Published: 22 October 2019
(This article belongs to the Section Forest Ecology and Management)
The intraspecific variation of climate–growth relationships observed on provenance trials results from among–provenance differences in phenotypic plasticity. Temporal variation in radial growth synchrony among provenances may be modified by adverse climatic/biotic conditions such as drought or insect defoliation. However, these factors can potentially diminish provenance–specific growth reactions and, consequently, prevent the identification of provenances with the highest adaptive potential. Thus, understanding the influence of major biotic conditions on provenance–specific climate–growth relationships seems to be important to anticipate climate change. To determine provenance–specific growth patterns in relation to climate conditions (drought), seed production (reproductive effort), and insect defoliation in a common garden of Scots pine (Pinus sylvestris L.), we applied dendroecological techniques to time–series of tree–ring widths and basal area increments. The long–term records of seed production and insect outbreaks from the local Scots pine stands were used to explain the potential effect of biotic factors on the temporal dynamics of radial growth synchrony. During a period of favorable growth conditions, Scots pine provenances showed a decline in inter–provenance synchronicity in growth patterns, while during years affected by severe soil water deficit and insect defoliation, they manifested high uniformity in growth dynamics. The long–term trend in growth synchrony among P. sylvestris provenances depend on both abiotic and biotic environmental factors. This gains significance following an introduction of the appropriate selection of tree provenances for climate–smart forestry. View Full-Text
Keywords: dendroecology; drought; insect outbreaks; natural disturbances; regeneration; suitable forest management dendroecology; drought; insect outbreaks; natural disturbances; regeneration; suitable forest management
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Klisz, M.; Puchałka, R.; Wilczyński, S.; Kantorowicz, W.; Jabłoński, T.; Kowalczyk, J. The Effect of Insect Defoliations and Seed Production on the Dynamics of Radial Growth Synchrony among Scots Pine Pinus sylvestris L. Provenances. Forests 2019, 10, 934.

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