Extension of the growing season increases vegetation exposure to frost.

Extension of the growing season increases vegetation exposure to frost.
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生长季节的延长增加了植被遭受霜冻的机会

DOI:
10.1038/s41467-017-02690-y
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发表时间:
2018-01-30
影响因子:
16.6
通讯作者:
Wang T
Wang T
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Liu Q;Piao S;Janssens IA;Fu Y;Peng S;Lian X;Ciais P;Myneni RB;Peñuelas J;Wang T

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虽然气候变暖减少了霜冻事件的发生,但变暖导致的北方半球植物生长季节的延长实际上可能导致生长季节更频繁的霜冻日(GSFD,最低温度< 0 ℃的天数)。然而,这一假设的直接证据是有限的。在这里,我们调查的GSFD的数量在纬度大于30 N使用遥感和原位物候记录和三个最低温度(Tmin)数据集从1982年到2012年的变化。虽然在北方西伯利亚,青藏高原和北美西北部(主要在秋季)发现GSFD减少,但在1982年至2012年期间,约43%的半球,特别是欧洲,GSFD显着增加(主要在春季)。总体而言,生长季节长度增加较大的地区表现出较大的GSFD增加。因此,气候变暖减少了每年霜冻的总天数,但在许多地区,GSFD仍然增加。
While climate warming reduces the occurrence of frost events, the warming-induced lengthening of the growing season of plants in the Northern Hemisphere may actually induce more frequent frost days during the growing season (GSFDs, days with minimum temperature< 0 C). Direct evidence of this hypothesis, however, is limited. Here we investigate the change in the number of GSFDs at latitudes greater than 30 N using remotely-sensed and in situ phenological records and three minimum temperature (Tmin) data sets from 1982 to 2012. While decreased GSFDs are found in northern Siberia, the Tibetan Plateau, and northwestern North America (mainly in autumn),~ 43% of the hemisphere, especially in Europe, experienced a significant increase in GSFDs between 1982 and 2012 (mainly during spring). Overall, regions with larger increases in growing season length exhibit larger increases in GSFDs. Climate warming thus reduces the total number of frost days per year, but GSFDs nonetheless increase in many areas.
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