Melanin mitigates the accelerated decay of mycorrhizal necromass with peatland warming
Melanin mitigates the accelerated decay of mycorrhizal necromass with peatland warming
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DOI：
10.1111/ele.13209
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发表时间：
2019-03-01
期刊：
影响因子：
8.8
通讯作者：
Kennedy, Peter G.
中科院分区：
文献类型：
--
作者：
Fernandez, Christopher W.;Heckman, Katherine;Kennedy, Peter G.
尽管是一个显着的输入到许多高纬度生态系统的土壤碳库，很少有人知道气候变化对菌根真菌坏死物的营业额的影响。在这里，我们提出了第一个实验的结果，研究气候变化对菌根necromass的长期分解的影响，利用云杉和泥炭地在不断变化的环境下的反应（SPRUCE）实验。变暖显着增加necomass分解率，但最强的通常淹没微型变暖引起地下水位下降。Necromass化学对分解产生了最强的控制，初始氮含量强烈预测早期衰变率（3个月），初始黑色素含量决定2年后剩余的质量。总的来说，我们的研究结果表明，随着全球气温的上升，物种的生化性状的变化，以及菌根necromass沉积的微网站将决定如何这些重要的投入有助于地下储存的碳在北方泥炭地。
Despite being a significant input into soil carbon pools of many high-latitude ecosystems, little is known about the effects of climate change on the turnover of mycorrhizal fungal necromass. Here, we present results from the first experiment examining the effects of climate change on the long-term decomposition of mycorrhizal necromass, utilising the Spruce and Peatland Response Under Changing Environments (SPRUCE) experiment. Warming significantly increased necromass decomposition rates but was strongest in normally submerged microsites where warming caused water table drawdown. Necromass chemistry exerted the strongest control on the decomposition, with initial nitrogen content strongly predicting early decay rates (3 months) and initial melanin content determining mass remaining after 2 years. Collectively, our results suggest that as global temperatures rise, variation in species biochemical traits as well as microsites where mycorrhizal necromass is deposited will determine how these important inputs contribute to the belowground storage of carbon in boreal peatlands.