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Contrasting climate drivers of seasonal growth in western vs. eastern Mexican mountain conifer forests
Forest Ecosystems ( IF 4.1 ) Pub Date : 2023-01-12 , DOI: 10.1016/j.fecs.2023.100091
Marín Pompa-García, J. Julio Camarero, Eduardo D. Vivar-Vivar

Hydroclimate affects the radial growth responses of trees, but the drivers of their spatial and population variability are not sufficiently understood. We addressed this issue by sampling several conifer populations located at the same latitude, but at different longitude and elevation in western (W) and eastern (E) Mexican regions. We used dendroecology to disentangle how earlywood width (EW), latewood width (LW) and adjusted LW (LWadj), i.e. the residuals after removing EW influences on LW, responded to climate variables (temperature and precipitation), climate indices (Southern Oscillation Index, SOI, Niño 3.4, Pacific Decadal Oscillation, PDO) and a drought index (Standardised Precipitation-Evapotranspiration Index, SPEI). The W species (Pinus herrerae Martínez, Pinus durangensis Martínez, Abies durangensis Martínez and Cupressus lusitanica Mill.) showed lower growth rates than the E species (Pinus hartwegii Lindl., Picea mexicana Martínez, Pseudotsuga menziesii (Mirb.) Franco and Abies vejari Martínez). Growth in W benefits mostly from high precipitation in the prior winter and current spring and it is limited by high temperatures in spring, whereas growth in the E showed similar but weaker responses. Furthermore, positive (negative) correlations were found in radial growth with the Niño 3.4 (SOI) and the PDO from the prior to current autumns, which were again stronger in absolute terms in the W than in the E regions, excepting SOI in summer. In the W, P. durangensis and C. lusitanica were the least and most responsive species to spring drought, respectively; whilst P. menziesii and A. vejari were very responsive to spring drought compared to P. hartwegii in the E. Our results suggest greater responsiveness to hydroclimate and atmospheric patterns in the W than in the E region. These findings allow better interpretations of future changes in growth and composition in Mexican conifer forests, considering that climate models forecast warmer spring conditions and increased water shortage.



中文翻译:

墨西哥西部和东部山区针叶林季节性生长的气候驱动因素对比

水文气候影响树木的径向生长反应,但其空间和种群变异性的驱动因素尚未得到充分了解。我们通过对位于同一纬度但在墨西哥西部 (W) 和东部 (E) 地区的不同经度和海拔的几个针叶树种群进行采样来解决这个问题。我们使用树木生态学来弄清早材宽度 (EW)、晚材宽度 (LW) 和调整后的长材宽度 (LWadj),即去除 EW 对长材的影响后的残差,对气候变量(温度和降水)、气候指数(南方涛动指数)的反应, SOI, Niño 3.4, Pacific Decadal Oscillation, PDO) 和干旱指数(标准化降水-蒸散指数, SPEI)。W种(Pinus herrerae Martínez, Pinus durangensisMartínez、Abies durangensis Martínez 和Cupressus lusitanica Mill.) 的生长速度低于 E 种(Pinus hartwegii Lindl.、Picea mexicana Martínez、Pseudotsuga menziesii (Mirb.) Franco 和Abies vejari Martínez)。W 的增长主要受益于前一个冬季和当前春季的高降水量,并受到春季高温的限制,而 E 的增长显示出类似但较弱的响应。此外,在当前秋季之前的 Niño 3.4 (SOI) 和 PDO 的径向增长中发现了正(负)相关性,W 区的绝对值再次强于 E 区,夏季的 SOI 除外。在 W 中,P. durangensisC. lusitanica分别是对春季干旱最不敏感和最敏感的物种;而与E 区的P. hartwegii相比, P. menziesiiA. vejari对春季干旱非常敏感。我们的结果表明 W 区对水文气候和大气模式的反应比 E 区更大。考虑到气候模型预测温暖的春季条件和水资源短缺加剧,这些发现可以更好地解释墨西哥针叶林生长和组成的未来变化。

更新日期:2023-01-12
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