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Moisture-driven changes in the sensitivity of the radial growth of Picea crassifolia to temperature, northeastern Tibetan Plateau
Dendrochronologia ( IF 3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.dendro.2020.125761
Wenqi Song , Changcheng Mu , Yuandong Zhang , Xu Zhang , Zongshan Li , Huiying Zhao , Xiaochun Wang

Abstract Precipitation is one of the most important climate factors controlling tree growth, yet it is not fully understood how changes in precipitation affect the relationship between growth and temperature. On the northeastern edge of the Tibetan Plateau, nine tree-ring chronologies of Picea crassifolia were developed along a precipitation gradient from semi-arid (mean annual precipitation, 255 mm) to semi-humid (710 mm). We analyze the growth-climate relationships along this precipitation gradient and assess whether these associations are regulated by local precipitation. From 1960 to 2014, temperature increased significantly while precipitation remained stable at the nine sampling sites. The radial growth of P. crassifolia decreased at the semi-arid sites but increased at the semi-humid sites. Growth-temperature relationships gradually changed from negative to positive along the precipitation gradient (from dry to wet sites), particularly during summer. The moist P. crassifolia sites are also characterized by positive correlations with the Palmer Drought Severity Index. The temporal growth-temperature relationships varied significantly among the different spruce sites over the last five decades. Although temperature remains the main factor controlling the growth of P. crassifolia, local precipitation variability is becoming increasingly important. Our findings indicate that considering species distribution areas supports the analyses of the impact of climate change on tree growth.

中文翻译:

水分驱动的青藏高原东北部云杉径向生长对温度敏感性的变化

摘要 降水是控制树木生长的最重要的气候因素之一,但降水变化对生长与温度关系的影响尚不完全清楚。在青藏高原东北缘,沿半干旱(年平均降水量 255 mm)到半湿润(710 mm)的降水梯度发育了 9 个厚叶云杉树轮年表。我们分析沿该降水梯度的生长-气候关系,并评估这些关联是否受当地降水调节。1960年至2014年,9个采样点气温明显升高,降水量保持稳定。P. crassifolia 的径向生长在半干旱地区减少,但在半湿润地区增加。生长-温度关系沿着降水梯度(从干地到湿地)逐渐从负变为正,特别是在夏季。潮湿的 P. crassifolia 站点的特征还在于与 Palmer 干旱严重程度指数呈正相关。在过去的 50 年中,不同云杉地点之间的时间生长-温度关系差异很大。虽然温度仍然是控制 P. crassifolia 生长的主要因素,但局部降水变化变得越来越重要。我们的研究结果表明,考虑物种分布区域支持分析气候变化对树木生长的影响。crassifolia 站点的特征还在于与 Palmer 干旱严重程度指数呈正相关。在过去的 50 年中,不同云杉地点之间的时间生长-温度关系差异很大。虽然温度仍然是控制 P. crassifolia 生长的主要因素,但局部降水变化变得越来越重要。我们的研究结果表明,考虑物种分布区域支持分析气候变化对树木生长的影响。crassifolia 站点的特征还在于与 Palmer 干旱严重程度指数呈正相关。在过去的 50 年中,不同云杉地点之间的时间生长-温度关系差异很大。虽然温度仍然是控制 P. crassifolia 生长的主要因素,但局部降水变化变得越来越重要。我们的研究结果表明,考虑物种分布区域支持分析气候变化对树木生长的影响。当地降水变率变得越来越重要。我们的研究结果表明,考虑物种分布区域支持分析气候变化对树木生长的影响。当地降水变率变得越来越重要。我们的研究结果表明,考虑物种分布区域支持分析气候变化对树木生长的影响。
更新日期:2020-12-01
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