Pensa Margus, Sepp Mait, Jalkanen Risto
Finnish Forest Research Institute, P.O. Box 16, 96301, Rovaniemi, Finland.
Int J Biometeorol. 2006 Mar;50(4):205-14. doi: 10.1007/s00484-005-0013-8. Epub 2005 Dec 6.
The relationships between climatic variables and Scots pine (Pinus sylvestris L.) growth and needle dynamics were studied in three stands in Estonia and in four stands located near the northern timberline in Lapland. The trees sampled in Estonia had low correlations with the analysed climatic variables (air temperature, precipitation and indices of atmospheric circulation). Moreover, the weak cross-correlation of the time-series of the Estonian sample trees indicated that Scots pine is affected mainly by local factors in that region. In Lapland, however, height increment and needle production correlated strongly among trees within a stand (mean r=0.45 and 0.46, respectively) and between stands (r=0.32 and 0.37). Radial increment also showed a high inter-correlation among the trees within a stand in Lapland (r=0.45). Both height increment and needle production were strongly influenced by the temperature regime of the previous summer in Lapland (mean r=0.64 and 0.64, respectively). Radial increment was correlated with the mean July temperature of the current year (mean r=0.29). The correlations between the indices of atmospheric circulation and tree attributes were weak, while the strongest correlation was between the Ponta Delgada NAO index (PD-NAO) and height increment and needle production in Lapland. Height increment, needle production and radial increment have increased since the 1990s in the trees growing in Lapland. This may indicate a positive effect of climate warming on tree growth in Lapland. In Estonia, where climatic conditions do not limit tree growth, the climate warming seems not to directly influence the growth and needle dynamics of Scots pine.
在爱沙尼亚的三个林分以及拉普兰靠近北部树木线的四个林分中，研究了气候变量与欧洲赤松（Pinus sylvestris L.）生长及针叶动态之间的关系。在爱沙尼亚采样的树木与分析的气候变量（气温、降水和大气环流指数）之间的相关性较低。此外，爱沙尼亚样本树时间序列的弱交叉相关性表明，欧洲赤松在该地区主要受当地因素影响。然而，在拉普兰，林分内树木之间的树高生长量和针叶产量相关性很强（平均r分别为0.45和0.46），林分之间的相关性也很强（r分别为0.32和0.37）。在拉普兰，林分内树木之间的径向生长量也表现出高度相关性（r = 0.45）。在拉普兰，树高生长量和针叶产量都受到前一个夏季温度状况的强烈影响（平均r分别为0.64和0.64）。径向生长量与当年7月平均温度相关（平均r = 0.29）。大气环流指数与树木属性之间的相关性较弱，而最强的相关性是拉普兰的蓬塔德尔加达北大西洋涛动指数（PD - NAO）与树高生长量和针叶产量之间的相关性。自20世纪90年代以来，拉普兰生长的树木的树高生长量、针叶产量和径向生长量都有所增加。这可能表明气候变暖对拉普兰树木生长有积极影响。在气候条件不限制树木生长的爱沙尼亚，气候变暖似乎并未直接影响欧洲赤松的生长和针叶动态。
