Specification of thermal growing season in temperate China from 1960 to 2009
Specification of thermal growing season in temperate China from 1960 to 2009
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DOI：
10.1007/s10584-012-0434-4
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发表时间：
2012-03
期刊：
影响因子：
4.8
通讯作者：
M. Shen;Yanhong Tang;Jin Chen;Wei Yang
中科院分区：
文献类型：
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作者：
M. Shen;Yanhong Tang;Jin Chen;Wei Yang
一些研究报告说，近几十年来，由于气候变暖，热生长季节延长。然而，扩展的幅度在很大程度上取决于所使用的阈值温度：对于一个给定的区域，阈值温度的微小变化会导致计算的热生长季节的显着差异。在此，我们指定了阈值温度，确定当地植被的热生长季节在中国温带326个气象站，利用植被物候基于卫星图像。我们研究了从1960年到2009年热生长季节的开始，结束和长度的变化。决定开始和结束的阈值温度随着年平均温度的增加而增加。在中国温带地区，平均热生长季节的开始提前了8.4天，结束推迟了5.7天，导致1960年至2009年延长了14.1天。自1980年代中期以来，由于这一时期的加速变暖，热生长季节大幅延长（每年延长0.59天）。这一延伸与由5 °C的空间固定阈值温度确定的延伸相似，但由于阈值温度的差异和气候变暖的年内异质性，空间模式不同。该研究强调了在评估气候变化对热生长季节的影响时，指定当地植被的温度阈值的重要性，并提供了一种从卫星获取的植被物候确定阈值温度的方法。
A number of studies have reported an extension of the thermal growing season in response to the warming climate during recent decades. However, the magnitude of extension depends heavily on the threshold temperature used: for a given area, a small change in the threshold temperature results in significant differences in the calculated thermal growing season. Here, we specified the threshold temperature for determining the thermal growing season of local vegetation across 326 meteorological stations in temperate China by using vegetation phenology based on satellite imagery. We examined changes in the start, end, and length of the thermal growing season from 1960 to 2009. The threshold temperatures for determining the start and end increased strongly with increasing mean annual temperature. Averaged across temperate China, the start of the thermal growing season advanced by 8.4 days and the end was delayed by 5.7 days, resulting in a 14.1-day extension from 1960 to 2009. The thermal growing season was intensively prolonged (by 0.59 day/year) since the mid-1980s owing to accelerated warming during this period. This extension was similar to that determined by a spatially fixed threshold temperature of 5 °C, but the spatial patterns differed, owing to differences in the threshold temperature and to intra-annual heterogeneity in climate warming. This study highlights the importance of specifying the temperature threshold for local vegetation when assessing the influences of climate change on thermal growing season, and provides a method for determining the threshold temperature from satellite-derived vegetation phenology.