Diverse responses of vegetation phenology to a warming climate
Diverse responses of vegetation phenology to a warming climate
复制标题
DOI：
10.1029/2007gl031447
复制
发表时间：
2007-10-11
影响因子：
5.2
通讯作者：
Sullivan, Jerry T.
中科院分区：
文献类型：
--
作者：
Zhang, Xiaoyang;Tarpley, Dan;Sullivan, Jerry T.
[1]气候变暖已被广泛认为是促进春季植被物候的因素。然而，植被物候对温度升高的延迟响应及其机制知之甚少。利用1982年至2005年的卫星和气候数据，我们揭示了一个纬度过渡带的绿化开始在植被群落，在北美的变暖的温度已经dilemma响应。从北纬40度向北，冬季寒冷的植被休眠释放的要求是远远超过了寒冷的日子变暖的冬季温度的减少对热时间的要求绿开始的影响不大。因此，春季气温变暖使绿化开始时间不断提前0.32天/年。而从北纬40度向南，冬季寒冷日数的减少不足以满足植被的冷需，因此春季绿化开始的热时要求逐渐增加。因此，植被绿化开始逐渐变化，从早期的趋势（北部地区）到后来的趋势（南部地区）沿沿着纬度过渡带从40-31度N，其中开关发生在35度N左右。在31 ° N以下，绿变开始延迟0.15天/年。
[1] Warming climates have been widely recognized to advance spring vegetation phenology. However, the delayed responses of vegetation phenology to rising temperature and their mechanisms are poorly understood. Using satellite and climate data from 1982 to 2005, we reveal a latitude transition zone of greenup onset in vegetation communities that has diversely responded to warming temperature in North America. From 40 degrees N northwards, a winter chilling requirement for vegetation dormancy release is far exceeded and the decrease in chilling days by warming winter temperature has little impact on thermal-time requirements for greenup onset. Thus, warming spring temperature has constantly advanced greenup onset by 0.32 days/year. However, from 40 degrees N southward, the shortened winter chilling days are insufficient for fulfilling vegetation chilling requirement, so that the thermal-time requirement for greenup onset during spring increases gradually. Consequently, vegetation greenup onset changes progressively from an early trend ( north region) to a later trend ( south region) along the latitude transition zone from 40-31 degrees N, where the switch occurs around 35 degrees N. The greenup onset is delayed by 0.15 days/year below 31 degrees N.