Temperate forests worldwide are dominated by two families, Pinaceae and Fagaceae. In the last decades, temperate forests are experiencing rapid changes and, in some regions, a directional increase in Fagaceae abundance at the expense of Pinaceae has been detected. Here, we analyze the recent forest dynamics of Pinaceae and Fagaceae in Mexican forests to assess whether there is a directional change in the relative abundance of these two families and identify the environmental factors that are determining their recent growth dynamics. We take advantage of repeated surveys data from the Mexican National Forest and Soil Inventory, obtained in 2004–2007 and 2009–2014. Our results show that, at present, there is no overall directional trend in the changes of the relative abundance of Pinaceae and Fagaceae in the temperate forests of Mexico, which likely reflects a complex mixture of forest dynamics, locally dominated by different types of disturbance or successional dynamics. At the same time, however, we find evidence that the growth of Fagaceae species is responding more favorably than that of Pinaceae to currently rising temperatures in Mexico. Although these results need to be confirmed by longer-term studies, the resulting changes in composition could potentially have strong impacts on forest ecosystem function in the midterm.

中文翻译：

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墨西哥松树林和橡树林的近期动态

世界范围内的温带森林由松科和壳斗科两个科主宰。在过去的几十年里，温带森林正在经历快速的变化，在一些地区，已经检测到以松科为代价的壳斗科丰度的定向增加。在这里，我们分析了墨西哥森林中松科和壳斗科的近期森林动态，以评估这两个科的相对丰度是否存在定向变化，并确定决定其近期生长动态的环境因素。我们利用了 2004-2007 年和 2009-2014 年获得的墨西哥国家森林和土壤清单的重复调查数据。我们的研究结果表明，目前墨西哥温带森林松科和壳斗科相对丰度的变化没有整体的方向性趋势，这可能反映了森林动态的复杂混合，局部由不同类型的干扰或演替动态主导。然而，与此同时，我们发现有证据表明，壳斗科物种的生长对目前墨西哥气温上升的反应比松科更有利。尽管这些结果需要通过长期研究来证实，但由此产生的成分变化可能会对中期的森林生态系统功能产生重大影响。