ABSTRACT We employ a dendrochronological approach to examine spatial variation in radial tree growth-climate relationships and responses to global climate oscillations across the geographic ranges of Picea glauca and Picea engelmannii. Tree-ring chronologies were constructed for 77 sites and analyzed using correlation coefficients for monthly climatic variables. In general, for Picea glauca, stands in the western portion of its range had significant negative correlations with temperature during fall, winter, and spring; only summer temperature was positively correlated with tree growth. In eastern North America, Picea glauca growth was negatively correlated with winter and spring temperature. Across the north-south range of Picea engelmannii, growth of northern populations was positively correlated with temperature in most seasons except spring, which had negative correlations, and response to winter precipitation differed between northern and southern populations. However, some monthly values for both species correlations were altered due to decadal oscillation phase, especially for the Pacific Decadal Oscillation.

中文翻译：

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Picea glauca 和 Picea engelmannii 在加拿大和美国的径向生长：每月气候、年代际振荡和气候变化

摘要 我们采用树状年代学方法来研究径向树生长与气候关系的空间变化以及对云杉和恩格曼云杉地理范围内全球气候振荡的响应。为 77 个地点构建了年轮年表，并使用每月气候变量的相关系数进行分析。总体而言，云杉分布区西部的林分与秋、冬、春季温度呈显着负相关；只有夏季温度与树木生长呈正相关。在北美东部，云杉的生长与冬春季温度呈负相关。在北南云杉范围内，除春季外，大多数季节北方种群的增长与温度呈正相关，呈负相关，北方和南方人群对冬季降水的反应不同。然而，由于年代际振荡阶段，特别是太平洋年代际振荡，两种物种相关性的一些月度值发生了变化。