20世纪以来中国北方干旱半干旱区针叶树种径向生长动态变化

全球变暖不断影响着森林生态系统的结构和功能，其中森林生产力受到大范围极端干旱的限制更为强烈，并表现出显著的空间异质性。本数据集通过对中国北方干旱半干旱区257个树木年轮样点进行生长趋势检测和气候驱动因子评估，确定了自20世纪以来树木径向生长动态变化及其对气候因子响应模式。分析结果表明中国西部地区(包括新疆)树木径向生长呈持续增加趋势，华北地区呈波动式增加，东北地区则在20世纪中叶后呈下降趋势。空间响应模式表明水分对所有区域的树木径向生长存在积极作用，气温上升引起的蒸散发加剧则会抑制树木径向生长，然而西北地区生长季变化对树木径向生长的影响受益于暖湿化现象产生的热效应。大气环流因子从年际到年代际尺度上通过调节全球海温和气压强度变化，对亚洲季风区降水产生显著作用，在一定程度上影响了中国北方干旱半干旱区树木径向生长动态。在未来气候变化情景下受全球变暖影响，延长的生长季会促进区域树木径向生长，而低降水量引起的干旱胁迫仍然对树木径向生长存在限制作用，特别是在水分缺乏的中国西部地区。

Global warming has continuously affected the structure and function of forest ecosystems, and forest productivity is more strongly restricted by large-scale extreme drought, exhibiting significant spatial heterogeneity. This dataset clarifies the dynamic changes of tree radial growth and their response patterns to climatic factors since the 20th century, via conducting growth trend detection and climatic driving factor assessment on 257 tree ring sampling sites located in the arid and semi-arid regions of northern China. Analysis results demonstrate that the radial growth of trees in western China (including Xinjiang) shows a continuous increasing trend, that in North China shows a fluctuating increasing trend, and that in Northeast China exhibits a downward trend since the mid-20th century. Spatial response patterns demonstrate that moisture exerts a positive effect on tree radial growth across all regions, whereas increased evapotranspiration induced by rising temperatures inhibits such growth. However, the impact of growing season changes on tree radial growth in Northwest China benefits from the thermal effects generated by the warming-wetting phenomenon. Atmospheric circulation factors, which regulate variations in global sea surface temperature and atmospheric pressure intensity across interannual to interdecadal scales, significantly influence precipitation in the Asian monsoon region, thereby affecting the dynamic trends of tree radial growth in the arid and semi-arid regions of northern China to a certain extent. Under future climate change scenarios influenced by global warming, an extended growing season will promote regional tree radial growth, yet drought stress induced by low precipitation still imposes restrictions on such growth, particularly in the water-scarce western regions of China.