Key message

Baldcypress, a long-lived species of riparian habitats, is sensitive to interannual climate variability. The annual radial growth is associated with the Standardized Precipitation Evaporation Index (SPEI) and Palmer Drought Severity Index (PDSI), both depending on a water balance.

Abstract

The baldcypress (Taxodium mucronatum Ten.) is a long-lived species and Mexico’s national tree. The objective of this study was to analyze the dendroclimatic response of baldcypress at sites located on the transitional zone between the semiarid and subtropical regions of Mexico, known as the Middle Zone of the state of San Luis Potosi, Mexico. The first site, Los Peroles (LPO), is a wetland where the oldest known baldcypress specimens in Mexico are found. The second site, Rio Verde (RVDE), is a riparian site located along a tributary of the Moctezuma River that drains into the Gulf of Mexico. Two ring-width chronologies were analyzed. The first one from LPO with a length of 633 years and the second one from RVDE with a length of 423 years. The species responded positively to the seasonal January–July precipitation (r = 0.52, p = 0.001) and negatively to the maximum monthly temperature of January, May, and June (r = − 0.42, −0.46, and −0.34; respectively). The average chronology was significantly associated with the mean January–August Standardized Precipitation Evaporation Index (SPEI) (r = 0.62, p = 0.000). An SPEI reconstruction was developed for the period 1575–1996 where the most prolonged and severe droughts were found at 70-year peaks in the El Niño Southern Oscillation frequency band. The annual radial growth of the species is a suitable indicator of the January–August water availability, and is important information that can be used to establish water management strategies for this semiarid environment and to preserve millennial baldcypress specimens.

中文翻译：

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墨西哥圣路易斯坡托西的秃头（Taxodium mucronatum Ten。）的气候响应

关键信息

秃头柏是河岸生境的长寿物种，对年际气候变化敏感。年度径向增长与标准降水蒸发指数（SPEI）和帕尔默干旱严重度指数（PDSI）有关，两者均取决于水的平衡。

抽象

秃头（Taxodium mucronatum十）是一种长寿物种，是墨西哥的国树。这项研究的目的是分析秃顶柏在墨西哥半干旱和亚热带地区之间的过渡带（被称为墨西哥圣路易斯波托西州的中部地区）过渡地区的树状气候响应。第一个地点是Los Peroles（LPO），是一个湿地，发现了墨西哥最古老的秃头柏标本。第二个站点是里约佛得角（RVDE），是沿莫克特祖玛河支流流入墨西哥湾的河岸站点。分析了两个环宽年表。第一个来自LPO，长度为633年，第二个来自RVDE，长度为423年。该物种对一月至七月的季节性降水有积极响应（r  = 0.52，p = 0.001）和1月，5月和6月的最高每月最高温度分别为负（r 分别为-0.42，-0.46和-0.34）。平均年表与一月至八月的平均标准降水蒸发指数（SPEI）显着相关（r  = 0.62，p  = 0.000）。在1575年至1996年期间开发了SPEI重建工程，在该地震中，厄尔尼诺南部涛动频段的70年高峰出现了最长时间和最严重的干旱。该物种的年径向生长量是一月至八月可用水量的合适指标，并且是可用于建立该半干旱环境的水管理策略和保存千年秃头标本的重要信息。