Abstract A greater amplitude and higher mean intensity of the El Nino phenomenon have both been observed in the last few decades. In order to determine how tree growth and recent El Nino variabilities are associated within the East Asia subtropical forest (EASF), we conducted a dendroecological study using a network of 25 zonal tree-ring width chronologies from Pinus massoniana Lamb. trees distributed across extensive latitudinal (23 to 33°N) and elevational (77 to 1285 m) gradients in EASF. Using principal component analysis (PCA), bootstrapped correlations, spatial correlations, and mediation analysis, the associations among interannual tree radial growth (over the period of 1987 to 2015), El Nino variability, and the climate variables were tested. Our study indicates that the radial growth of P. massoniana is generally stimulated by climate anomalies (warmer/sunnier spring and fall and lower water deficit from winter to summer) positively associated with NINO3.4 index. Moreover, the results also demonstrate that the positive radial growth response to El Nino is significantly strengthened from south to north in the EASF, which could be attributed to tree growth benefiting more from the El Nino-related water deficit release and October sunshine increase in northern habitats, which are traditionally colder and drier than the south.

中文翻译：

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树木径向生长对东亚亚热带森林近期厄尔尼诺南部振荡变化的空间异质性响应

摘要 在过去的几十年里，人们已经观测到厄尔尼诺现象的更大振幅和更高的平均强度。为了确定东亚亚热带森林 (EASF) 内树木生长和最近的厄尔尼诺现象如何关联，我们使用来自马尾松的 25 个带状年轮宽度年表的网络进行了树木生态学研究。EASF 中分布在广泛的纬度（23 至 33°N）和海拔（77 至 1285 m）梯度上的树木。使用主成分分析 (PCA)、自举相关性、空间相关性和中介分析，测试了年际树木径向生长（1987 年至 2015 年期间）、厄尔尼诺变率和气候变量之间的关联。我们的研究表明 P 的径向生长。马尾松通常受到与 NINO3.4 指数正相关的气候异常的刺激（春季和秋季温暖/阳光充足，以及从冬季到夏季的水分亏缺较少）。此外，结果还表明，东亚太平洋地区自南向北对厄尔尼诺现象的正径向生长响应显着增强，这可能归因于树木生长更多地受益于厄尔尼诺现象相关的缺水释放和北部 10 月日照增加。栖息地，传统上比南方更冷、更干燥。