How tree growth responds to climate is determined by temperature and water availability, but climate change is causing shifts in forest growth that could be evaluated through tree-ring growth studies given that it is annual radial increase is influenced by interannual and multiannual climatic variations. We evaluated the influence of oceanic-atmospheric indices and the climate response on the annual radial increase of Pinus hartwegii Lindl. A total of 140 increment cores were obtained from 82 selected P. hartwegii specimens growing at the treeline of the Tancítaro stratovolcano, Michoacán, Mexico to develop a 348-year long ring-width chronology. Correlation and response function analyses were carried out between the tree-ring series and monthly climate records and by subperiods of 50 yrs. Climate records were obtained from six weather stations near the study site and oceanic-atmospheric indices were downloaded from international climatic sources. The chronology was related to drought indices involving precipitation, temperature, evaporation, and soil water content. The results indicated that accumulated precipitation from February to April, and the mean and minimum temperature from March to May and from September to November of the current growth year, had a positive correlation with the P. hartwegii ring-width chronology. The maximum temperature of March and May of the current growth year produced a negative correlation and in November positive correlation. The analysis of the response function indicated that P. hartwegii had a negative growth response to the average and maximum temperature of March. The analysis of the response function in 50-year subperiods indicated a stable response in precipitation from February to April of the period 1925 to 2000. However, when the temperature increased, the stability of the growth response became negative, mainly due to an increase in temperature in combination with low precipitation volumes, which usually occurs from March to May. The association between the ring-width series, and indices of ENSO (MEI, El Niño 4) showed a significant positive correlation, but negative with SOI. Similarly, the relationship with the PDO was positive, but negative with AMO. The association with drought indices (PDSI + JJA, PDSI*, SPEI) was positive and significant. We conclude that the populations of P. hartwegii of the Tancítaro stratovolcano constitute an ecological indicator of long-term precipitation and temperature variability and is a high-resolution proxy for regional rainfall reconstruction at least for the last three centuries.

树木生长对气候的反应取决于温度和水的可利用性，但是气候变化引起森林生长的变化，可以通过树木年轮生长研究进行评估，因为年径向增长受年际和多年期气候变化的影响。我们评估了海洋-大气指数和气候响应对哈氏松林年径向增加的影响。从82个选定的哈氏疟原虫中获得了140个增量核心标本生长在墨西哥米却肯州坦西塔罗（Tincítaro）平流层火山的林线上，以发展348年的环宽年表。在树木年轮系列与月度气候记录之间进行了相关和响应函数分析，并进行了50年的亚周期分析。从研究地点附近的六个气象站获得了气候记录，并从国际气候资源中下载了海洋大气指数。年表与干旱指数有关，涉及降水，温度，蒸发和土壤水分。结果表明，当前生长年的2月至4月的累积降水，3月至5月以及9月至11月的平均和最低温度与哈氏疟原虫呈正相关。环宽年表。当前增长年份的三月和五月的最高温度产生负相关，而十一月则呈正相关。响应函数的分析表明哈氏疟原虫对三月的平均和最高温度有负增长响应。对50年亚周期响应函数的分析表明，从1925年至2000年的2月至4月，降水响应稳定。但是，当温度升高时，生长响应的稳定性变为负值，主要是由于通常在3月至5月会出现温度升高和降水量偏低的情况。环宽序列与ENSO指数（MEI，厄尔尼诺4）之间的关联显示出显着的正相关，但与SOI呈负相关。同样，与PDO的关系是积极的，但与AMO的关系是消极的。与干旱指数（PDSI + JJA，PDSI *，SPEI）的关联是积极且显着的。我们得出结论，哈特韦格氏菌的种群 Tancítaro层状火山的特征构成了长期降水和温度变化的生态指标，并且至少在过去三个世纪中是区域降雨重建的高分辨率代表。