Shifts in dominant tree mycorrhizal associations in response to anthropogenic impacts
Shifts in dominant tree mycorrhizal associations in response to anthropogenic impacts
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DOI：
10.1126/sciadv.aav6358
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发表时间：
2019-04-01
期刊：
影响因子：
13.6
通讯作者：
Phillips, Richard P.
中科院分区：
文献类型：
--
作者：
Jo, Insu;Fei, Songlin;Phillips, Richard P.
植物-真菌共生在植被动态和养分循环中发挥着重要作用，调节着全球变化对生态系统功能的影响。在这里，我们使用了由300多万棵树组成的森林清查数据，开发了一个空间分辨率高的“菌根树图”，覆盖了美国本土。我们发现两种优势菌根树群——丛枝菌根（AM）和外生菌根树的丰度主要与气候有关。此外，我们表明，在过去的三十年中，人为影响，主要是氮(N)沉积和灭火，以及气候变化，增加了美国东部AM树的优势。鉴于该地区大多数AM主导的森林是由高氮有效性的土壤构成的，我们的研究结果表明，AM树丰度的增加有可能导致养分加速，对森林生产力、生态系统碳和养分保留以及对气候变化的反馈产生重要影响。
Plant-fungal symbioses play critical roles in vegetation dynamics and nutrient cycling, modulating the impacts of global changes on ecosystem functioning. Here, we used forest inventory data consisting of more than 3 million trees to develop a spatially resolved "mycorrhizal tree map" of the contiguous United States. We show that abundances of the two dominant mycorrhizal tree groups-arbuscular mycorrhizal (AM) and ectomycorrhizal trees-are associated primarily with climate. Further, we show that anthropogenic influences, primarily nitrogen (N) deposition and fire suppression, in concert with climate change, have increased AM tree dominance during the past three decades in the eastern United States. Given that most AM-dominated forests in this region are underlain by soils with high N availability, our results suggest that the increasing abundance of AM trees has the potential to induce nutrient acceleration, with critical consequences for forest productivity, ecosystem carbon and nutrient retention, and feedbacks to climate change.