Impact of solar activity on growth of pine trees (Pinus cembra: 1610 - 1970; Pinus pinaster: 1910 -1989)

Details Impact of solar activity on growth of pine trees (Pinus cembra: 1610 - 1970; Pinus pinaster: 1910 -1989) Impact of solar activity on growth of pine trees (Pinus cembra: 1610 - 1970; Pinus pinaster: 1910 -1989)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010nspm.conf..184s&link_type=abstract

Proceedings of the 20th National Solar Physics Meeting, held 31 May - 4 June, 2010 in Papradno, Slovakia, p. 184-188

Physics

Scientific paper

In this work we have focused on the analysis of the data on the annual growth of cembra pine (Pinus cembra) grown in the Kôprová dolina Valley in the High Tatra Mountains. The database covers the period of 1406 - 1970, however, the sunspot data (minima and maxima) at the NGDC web site are only available since 1610. Moreover, reliable sunspot data are only available since 1749. The results of this analysis agree with the observation made in our previous work, i.e. there is a negative impact of high SA on the pine tree growth. However, it should be noted that statistical significance of the results is low. We also applied wavelet analysis to the data on the tree growth evolution, with the results indicating growth variations' period of about 20 years (duration of approximately two solar cycles or one magnetic cycle, respectively). A negative impact of the SA was also observed in growth of a 90 year-old maritime pine tree (Pinus pinaster) grown in northern Portugal. The width of the annual rings was smaller in the years of maximum SA; furthermore, it was found that it is the latewood growth that it is affected while the earlywood growth is not, and consequently the latewood additions also show a significative negative correlation with SA.

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