Institute of Atmospheric and Environmental Science, School of GeoSciences, Crew Building, University of Edinburgh, EH9 3JN, UK.
New Phytol. 2009 Nov;184(3):545-551. doi: 10.1111/j.1469-8137.2009.03026.x. Epub 2009 Sep 14.
Here, we investigated the interannual variation in the growth rings formed by Sitka spruce (Picea sitchensis) trees in northern Britain (55 degrees N, 3 degrees W) over the period 1961-2005 in an attempt to disentangle the influence of atmospheric variables acting at different times of year. Annual growth rings, measured along the north radius of freshly cut (frozen) tree discs and climatological data recorded at an adjacent site were used in the study. Correlations were based on Pearson product-moment correlation coefficients between the annual growth anomaly and these climatic and atmospheric factors. Rather weak correlations between these variables and growth were found. However, there was a consistent and statistically significant relationship between growth of the trees and the flux density of galactic cosmic radiation. Moreover, there was an underlying periodicity in growth, with four minima since 1961, resembling the period cycle of galactic cosmic radiation. * We discuss the hypotheses that might explain this correlation: the tendency of galactic cosmic radiation to produce cloud condensation nuclei, which in turn increases the diffuse component of solar radiation, and thus increases the photosynthesis of the forest canopy.
在这里，我们研究了英国北部（北纬 55 度，西经 3 度）的 Sitka 云杉（Picea sitchensis）树木在 1961 年至 2005 年期间年轮的年际变化，试图厘清在一年中不同时间作用的大气变量的影响。本研究使用了沿新切割（冷冻）树盘的北半径测量的年生长环和在相邻地点记录的气候数据。相关性基于年生长异常与这些气候和大气因素之间的皮尔逊积矩相关系数。发现这些变量与生长之间的相关性非常弱。然而，树木的生长与银河宇宙辐射通量密度之间存在一致且具有统计学意义的关系。此外，生长存在潜在的周期性，自 1961 年以来有四个最小值，类似于银河宇宙辐射的周期循环。我们讨论了可能解释这种相关性的假设：银河宇宙辐射产生云凝结核的趋势，这反过来又增加了太阳辐射的漫射分量，从而增加了森林冠层的光合作用。
