Sensitivity of Deciduous Forest Phenology to Environmental Drivers: Implications for Climate Change Impacts Across North America
Sensitivity of Deciduous Forest Phenology to Environmental Drivers: Implications for Climate Change Impacts Across North America
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DOI：
10.1029/2019gl086788
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发表时间：
2020-02
影响因子：
5.2
通讯作者：
B. Seyednasrollah;A. Young;Xiaolu Li;T. Milliman;T. Ault;S. Frolking;M. Friedl;A. Richardson
中科院分区：
文献类型：
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作者：
B. Seyednasrollah;A. Young;Xiaolu Li;T. Milliman;T. Ault;S. Frolking;M. Friedl;A. Richardson
预计温度和降水的变化将影响春季和秋季植被物候，从而影响许多生态系统生长季节的长度。然而，绿色和衰老对气候的敏感性仍然不确定。我们分析了北美落叶阔叶林的488个站点年的冠层绿度测量值。我们发现green‐up对温度异常的敏感性随着年平均温度的增加而增加，这表明随着我们向高纬度移动，温度敏感性降低。此外，秋季衰老对干地水分亏缺最为敏感，敏感性随年平均降水量的增加而降低。未来的预测表明，北美落叶森林在未来50年对温度的敏感度将更高，预计北部地区的变化将大于南部地区。我们的研究强调了气候系统中长期和短期变化之间的相互作用如何影响变绿和衰老。
Projected changes in temperature and precipitation are expected to influence spring and autumn vegetation phenology and hence the length of the growing season in many ecosystems. However, the sensitivity of green‐up and senescence to climate remains uncertain. We analyzed 488 site years of canopy greenness measurements from deciduous forest broadleaf forests across North America. We found that the sensitivity of green‐up to temperature anomalies increases with increasing mean annual temperature, suggesting lower temperature sensitivity as we move to higher latitudes. Furthermore, autumn senescence is most sensitive to moisture deficits at dry sites, with decreasing sensitivity as mean annual precipitation increases. Future projections suggest North American deciduous forests will experience higher sensitivity to temperature in the next 50 years, with larger changes expected in northern regions than in southern regions. Our study highlights how interactions between long‐term and short‐term changes in the climate system influence green‐up and senescence.