Tree-ring chronologies and the age structure of a Schrenk spruce (Picea schrenkiana) forest were developed to examine treeline dynamics in recent decades in relation to climatic variability.

• 在干旱或半干旱地区，温度是限制树木生长的重要气候因子。生长季开始时最低温度的升高有利于延长生长季,与年轮宽度正相关;