Plant phenological sensitivity to climate change on the Tibetan Plateau and relative to other areas of the world
Plant phenological sensitivity to climate change on the Tibetan Plateau and relative to other areas of the world
复制标题
青藏高原及相对于世界其他地区的植物物候对气候变化的敏感性
DOI：
10.1002/ecs2.2543
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发表时间：
2019-01-01
期刊：
影响因子：
2.7
通讯作者：
He, Jin-Sheng
中科院分区：
文献类型：
--
作者：
Ji Suonan;Classen, Aimee T.;He, Jin-Sheng
全球变暖和降水量的变化正在改变植物的物候，这对生态系统的功能和服务产生了重大影响。虽然一些研究已经单独解决了植物物候对变暖和降水变化的反应，但它们的相互作用可以改变植物物候，而不是单独改变。为了探索全球变化驱动因素之间的相互作用如何改变高山生态系统，我们在青藏高原的高山草甸进行了一项因子实验，同时控制变暖（环境和+2摄氏度）和改变降水量（减少50%，控制和增加50%）。在两年多的时间里，我们监测了植物的物候事件，叶开放日和第一次开花日，为11种常见的植物，占74.4%的总上述生物量。令人惊讶的是，有没有变暖和降水量的变化之间的相互作用对群落植物物候，但变暖提前脱叶和第一次开花日分别为7.10和9.79天。与社区的反应不同，植物功能群对实验气候驱动因素有各种直接和互动的反应。豆科植物的物候期受温度的影响最大，而温度和降水的交互作用改变了禾本科和杂类草的物候期。为了探索青藏高原植物物候敏感性与其他草甸生态系统的比较，我们将我们的数据集与全球植物物候数据集相结合。有趣的是，在青藏高原的物候敏感性的叶片脱落日和第一个开花日是7.3和37.8倍，分别是全球物候敏感性。这一结果表明，全球物候敏感性的荟萃分析可能大大低估了某些地区的变化，甚至像青藏高原这样大的地区。总之，我们的研究结果表明，随着气温变暖，青藏高原可能会经历快速变化，这些变化可能比世界其他地区更快。此外，我们的研究强调，如果我们要准确预测植物物候如何随着变暖而变化，我们需要了解驱动不同地区物候反应的特定环境线索。
Global warming and changes in precipitation are altering the phenology of plants that significantly impact the functioning and services of ecosystems. Although a number of studies have addressed responses of plant phenology to warming and altered precipitation individually, their interactions can alter plant phenology differently than either does independently. To explore how the interactions between global change drivers alter alpine ecosystems, we conducted a factorial experiment manipulating warming (ambient and +2 degrees C) and altered precipitation (50% decrease, control, and 50% increase) simultaneously in an alpine meadow on the Tibetan Plateau. Over two years, we monitored plant phenological events, leafout day and first flowering day, for 11 common plant species that account for 74.4% of the total above biomass. Surprisingly, there was no interaction between warming and changes in precipitation on community plant phenology, but warming advanced leaf-out and first flowering day by 7.10 and 9.79 d, respectively. Unlike the community response, plant functional groups had a variety of direct and interactive responses to the experimental climate drivers. While the phenology of legumes was most influenced by temperature, temperature and precipitation interacted to alter the phenology of grasses and forbs. To explore how plant phenological sensitivity on the Tibetan Plateau is compared with other meadow ecosystems, we combined our dataset with a global plant phenology dataset. Interestingly, the phenological sensitivity of leaf-out day and first flowering day on the Tibetan Plateau is 7.3 and 37.8 times greater than global phenological sensitivity, respectively. This result highlights that a meta-analysis of global phenological sensitivity may significantly underestimate change in some regions-even regions as large as the Tibetan Plateau. Together, our results suggest that the Tibetan Plateau may experience rapid change as temperatures warm and that these changes will likely be more rapid than in other regions of the world. Further, our study highlights that if we are to make accurate predictions of how plant phenology may change with warming, we need to understand the specific environmental cues that drive phenological responses across different areas.