Winter and spring warming result in delayed spring phenology on the Tibetan Plateau
Winter and spring warming result in delayed spring phenology on the Tibetan Plateau
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冬春季变暖导致青藏高原春季物候延迟
DOI：
10.1073/pnas.1012490107
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发表时间：
2010-11
影响因子：
11.1
通讯作者：
Jianchu Xu
中科院分区：
文献类型：
--
作者：
Haiying Yu;Eike Luedeling;Jianchu Xu
气候变化导致许多植物物种的春季阶段提前。然而，从理论上讲，冬季的强烈变暖可能会减缓寒冷需求的实现，这可能会推迟春季的物候。这种现象在气温迅速上升的地区尤其明显，这些地区的特点是植被对温度的反应非常敏感。为了验证这一假设，我们使用归一化植被指数比值法，以确定1982年至2006年之间的中国西部青藏高原草甸和草原植被的生长季节的开始，结束和长度。然后，我们将观测到的物候日期与记录的整个时期的每月温度相关联。对于这两种植被类型，春季物候最初是先进的，但在20世纪90年代中期开始撤退，尽管持续变暖。加上草原植被生长季节提前结束，这导致生长期缩短。偏最小二乘回归分析表明，冬季和春季气温对春季物候有较强的影响。虽然暖泉导致生长季节提前，但冬季温暖的条件导致春季阶段延迟。这种延迟似乎与后来满足冷却要求有关。由于大多数来自温带和寒冷气候的植物在冬季都会经历一段休眠期，因此在其他环境中似乎也会发生类似的影响。持续变暖可能会加强这种影响，减弱甚至逆转春季物候的发展趋势，迄今为止，春季物候一直主导着植物对气候变化的反应。
Climate change has caused advances in spring phases of many plant species. Theoretically, however, strong warming in winter could slow the fulfillment of chilling requirements, which may delay spring phenology. This phenomenon should be particularly pronounced in regions that are experiencing rapid temperature increases and are characterized by highly temperature-responsive vegetation. To test this hypothesis, we used the Normalized Difference Vegetation Index ratio method to determine the beginning, end, and length of the growing season of meadow and steppe vegetation of the Tibetan Plateau in Western China between 1982 and 2006. We then correlated observed phenological dates with monthly temperatures for the entire period on record. For both vegetation types, spring phenology initially advanced, but started retreating in the mid-1990s in spite of continued warming. Together with an advancing end of the growing season for steppe vegetation, this led to a shortening of the growing period. Partial least-squares regression indicated that temperatures in both winter and spring had strong effects on spring phenology. Although warm springs led to an advance of the growing season, warm conditions in winter caused a delay of the spring phases. This delay appeared to be related to later fulfillment of chilling requirements. Because most plants from temperate and cold climates experience a period of dormancy in winter, it seems likely that similar effects occur in other environments. Continued warming may strengthen this effect and attenuate or even reverse the advancing trend in spring phenology that has dominated climate-change responses of plants thus far.
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影响因子：
4.9
作者：
Qin Dahe;Liu Shiyin;Li Peiji
通讯作者：
Li Peiji
影响因子：
2.5
作者：
Freppaz, Michele;Celi, Luisella;Zanini, Ermanno
通讯作者：
Zanini, Ermanno
中国冬季积雪深度变化及其对植被的影响
影响因子：
11.6
作者：
Peng, Shushi;Piao, Shilong;Ciais, Philippe;Fang, Jingyun;Wang, Xuhui
通讯作者：
Wang, Xuhui
DOI：
10.1007/0044-7447-33.sp13.11
发表时间：
2004-11
期刊：
AMBIO: A Journal of the Human Environment
影响因子：
--
作者：
C. Körner
通讯作者：
C. Körner
影响因子：
64.8
作者：
M. D. Schwartz
通讯作者：
M. D. Schwartz