Divergent community trajectories with climate change across a fine‐scale gradient in snow depth
Divergent community trajectories with climate change across a fine‐scale gradient in snow depth
复制标题
雪深细尺度梯度上气候变化的不同群落轨迹
DOI：
10.1111/1365-2745.14223
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发表时间：
2023
影响因子：
5.5
通讯作者：
Emery, Nancy C.
中科院分区：
文献类型：
--
作者：
Oldfather, Meagan F.;Elmendorf, Sarah C.;Van Cleemput, Elisa;Henn, Jonathan J.;Huxley, Jared D.;White, Caitlin T.;Humphries, Hope C.;Spasojevic, Marko J.;Suding, Katharine N.;Emery, Nancy C.
由于复杂的地形，精细尺度的小气候变化可以塑造当前的植被分布模式和植被如何应对气候变化。山区的地形异质性被假设为介导对米尺度区域气候变化的反应。特别是对于高山植被，变化的温度和地形介导的积雪变化之间的相互作用将决定气候变化对植被动态的总体影响。我们结合了美国科罗拉多30年的温度，积雪和高山植物群落组成的共同定位测量，调查植被群落在雪深梯度上的轨迹。我们对植物群落组成的长期趋势的分析显示，气温升高的高山植被此外，群落的轨迹在雪深梯度上是不同的，暴露的部分景观经历了很少的积雪向耐压，寒冷和干旱适应的社区转移，而降雪地区向更温暖的社区转移。综合：我们的研究结果表明，精细尺度地形可以调解植被对气候变化的响应的幅度和方向。我们记录了30年来植物群落组成的显着变化，尽管高山植被以缓慢的动态而闻名，通常滞后于环境变化。这些结果表明，在这个网站上驱动高山植物种群和群落动态的过程是强大的，高度异质性的复杂地形，是高海拔山区系统的特点。
Fine‐scale microclimate variation due to complex topography can shape both current vegetation distributional patterns and how vegetation responds to changing climate. Topographic heterogeneity in mountains is hypothesized to mediate responses to regional climate change at the scale of metres. For alpine vegetation especially, the interplay between changing temperatures and topographically mediated variation in snow accumulation will determine the overall impact of climate change on vegetation dynamics.We combined 30 years of co‐located measurements of temperature, snow and alpine plant community composition in Colorado, USA, to investigate vegetation community trajectories across a snow depth gradient.Our analysis of long‐term trends in plant community composition revealed notable directional change in the alpine vegetation with warming temperatures. Furthermore, community trajectories are divergent across the snow depth gradient, with exposed parts of the landscape that experience little snow accumulation shifting towards stress‐tolerant, cold‐ and drought‐adapted communities, while snowier areas shifted towards more warm‐adapted communities.Synthesis: Our findings demonstrate that fine‐scale topography can mediate both the magnitude and direction of vegetation responses to climate change. We documented notable shifts in plant community composition over a 30‐year period even though alpine vegetation is known for slow dynamics that often lag behind environmental change. These results suggest that the processes driving alpine plant population and community dynamics at this site are strong and highly heterogeneous across the complex topography that is characteristic of high‐elevation mountain systems.
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