Nitrogen and phosphorus cycling in an ombrotrophic peatland: a benchmark for assessing change
Nitrogen and phosphorus cycling in an ombrotrophic peatland: a benchmark for assessing change
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营养泥炭地的氮磷循环:评估变化的基准
DOI:
10.1007/s11104-021-05065-x
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发表时间:
2021
期刊:
影响因子:
4.9
通讯作者:
Kolka, Randy K.
中科院分区:
文献类型:
--
作者:
Salmon, Verity G.;Brice, Deanne J.;Bridgham, Scott;Childs, Joanne;Graham, Jake;Griffiths, Natalie A.;Hofmockel, Kirsten;Iversen, Colleen M.;Jicha, Terri M.;Kolka, Randy K.
AimsSlow decomposition and isolation from groundwater mean that ombrotrophic peatlands store a large amount of soil carbon (C) but have low availability of nitrogen (N) and phosphorus (P). To better understand the role these limiting nutrients play in determining the C balance of peatland ecosystems, we compile comprehensive N and P budgets for a forested bog in northern Minnesota, USA.MethodsN and P within plants, soils, and water are quantified based on field measurements. The resulting empirical dataset are then compared to modern-day, site-level simulations from the peatland land surface version of the Energy Exascale Earth System Model (ELM-SPRUCE).ResultsOur results reveal N is accumulating in the ecosystem at 0.2 ± 0.1 g N m−2year−1but annual P inputs to this ecosystem are balanced by losses. Biomass stoichiometry indicates that plant functional types differ in N versus P limitation, with trees exhibiting a stronger N limitation than ericaceous shrubs orSphagnummoss. High biomass and productivity ofSphagnumresults in the moss layer storing and cycling a large proportion of plant N and P. Comparing our empirically-derived nutrient budgets to ELM-SPRUCE shows the model captures N cycling within dominant plant functional types well.ConclusionsThe nutrient budgets and stoichiometry presented serve as a baseline for quantifying the nutrient cycling response of peatland ecosystems to both observed and simulated climate change. Our analysis improves our understanding of N and P dynamics within nutrient-limited peatlands and represents a crucial step toward improving C-cycle projections into the twenty-first century.
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