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首页> 外文期刊>Regional Environmental Change >Long-term responses of mountain forests to environmental change in West-Central Mexico
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Long-term responses of mountain forests to environmental change in West-Central Mexico

机译：墨西哥中西部山区森林对环境变化的长期反应

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This study is an important contribution to the International Long-term Ecological Research Network (ILTER), because it presents the local responses of soil and plant composition to global and regional climatic oscillations of the last millennia in Mexico. Mountain forests are ecosystems that have been constantly threatened by both anthropogenic and climate disturbances, mainly over the Late Holocene. By using palaeoecological techniques with fossil pollen and geochemical elements as proxies, this study incorporates the relationship of trees, herbs and epiphytes with dry and humid climate events. High-temporal resolution in the chronologies allowed the assessment of vegetation changes (every similar to 30years) and soil geochemical elements in three forests located close (8km) to each other. Our results showed that pine forest contracted along the dry periods of the Little Ice Age (AD 1350-1850), the Medieval Climate Anomaly (AD 800 to 1200) and the Late Classic Drought (AD 600 to 800). However, it expanded in the humid period (AD 1200 to 1350). Cloud forest was the most susceptible ecosystem to the above climate anomalies; trees contracted in periods of aridity and expanded in humid periods. The signature for the transitional forest was confounding: trees increased partially in both dry and humid periods with a well-correlated decrease in epiphytes. Soil losses were common in dry periods while fires increased along the last similar to 300years.
机译：这项研究为国际长期生态研究网络（ILTER）做出了重要贡献，因为它提出了土壤和植物组成对墨西哥近千年来全球和区域气候振荡的局部响应。山区森林是一直受到人为和气候干扰（主要是晚全新世）威胁的生态系统。通过使用以化石花粉和地球化学元素为代表的古生态技术，本研究纳入了树木，草药和附生植物与干燥和潮湿气候事件的关系。时序上的高时间分辨率可以评估彼此靠近（<8 km）的三个森林中的植被变化（每30年相似）和土壤地球化学元素。我们的研究结果表明，松树林在小冰期（公元1350-1850年），中世纪气候异常（公元800-1200年）和晚期经典干旱（公元600-800年）的干旱时期收缩。但是，它在潮湿时期（公元1200年至1350年）扩张。云林是上述气候异常最敏感的生态系统；树木在干旱时期收缩，在潮湿时期膨胀。过渡性森林的标志令人困惑：在干旱和潮湿时期，树木的一部分增加，而附生植物的减少则与此相关。在干旱时期，土壤流失很常见，而在最近的300年中，火灾增加了。

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