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Experimental Warming Alters Productivity and Isotopic Signatures of Tundra Mosses

机译：实验性升温改变了苔原苔藓的生产力和同位素特征

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In the tundra, mosses play an important functional role regulating belowground and ecosystem processes, but there is still considerable uncertainty about how tundra moss communities will respond to climate change. We examined the effects of 5 years of in situ air and soil warming on net primary productivity (NPP), carbon (C) and nitrogen (N) isotope signatures (delta C-13 and delta N-15), and C:N in dominant Alaskan tundra mosses. Air warming increased mean air temperatures by up to 0.5A degrees C and resulted in an 80-90% reduction in NPP in the feather moss Pleurozium and the peat moss Sphagnum. Soil warming increased permafrost thaw depth by 12-18%, upper soil water content by 23-27%, and resulted in a threefold increase in Sphagnum NPP. delta C-13 was positively correlated with moss NPP, and increased by 0.5-1aEuro degrees in all mosses under soil warming. C:N was reduced in Sphagnum and Pleurozium, due to increases in tissue %N in the soil warming treatment, suggesting that moss N availability could increase as temperatures increases. Higher N availability in warmer conditions, however, may be offset by unfavorable moisture conditions for moss growth. Similar to responses in tundra vascular plant communities, our results forecast interspecific differences in productivity among tundra mosses. Specifically, air warming may reduce productivity in Sphagnum and Pleurozium, but soil warming could offset this response in Sphagnum. Such responses may lead to changes in tundra moss community structure and function as temperatures increase that have the potential to alter tundra C and N cycling in a future climate.
机译：在苔原，苔藓在调节地下和生态系统过程中起着重要的功能性作用，但是对于苔原苔藓群落如何应对气候变化仍然存在很大的不确定性。我们研究了原地空气和土壤变暖5年对净初级生产力（NPP），碳（C）和氮（N）同位素特征（δC-13和δN-15）以及C：N的影响。阿拉斯加主要苔原苔藓。空气变暖使平均气温升高了多达0.5A摄氏度，并使羽毛苔藓菇和泥炭藓球茎中的NPP降低了80-90％。土壤变暖使多年冻土融化深度增加了12-18％，上部土壤水分增加了23-27％，导致泥炭藓NPP增加了三倍。 δC-13与苔藓NPP呈正相关，在土壤变暖下所有苔藓中的增量都增加0.5-1aEuro度。由于土壤增温处理中组织N含量的增加，泥炭藓和侧耳中C：N的含量降低，这表明随着温度的升高，苔藓N的有效性可能会增加。但是，在较温暖的条件下更高的氮素利用率可能会因不利于苔藓生长的水分条件而被抵消。与苔原维管植物群落的反应相似，我们的结果预测苔原苔藓之间生产力的种间差异。具体而言，空气变暖可能会降低泥炭藓和侧耳的生产力，但土壤变暖可能会抵消泥炭藓的这种响应。这种反应可能会导致苔原苔藓群落结构和功能的变化，而温度会随着温度的升高而改变，从而有可能在未来的气候中改变苔原C和N的循环。

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