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Biogeochemistry

, Volume 124, Issue 1–3, pp 319–333 | Cite as

Long-term snowpack manipulation promotes large loss of bioavailable nitrogen and phosphorus in a subalpine grassland

  • Y. YanoEmail author
  • E. N. J. Brookshire
  • J. Holsinger
  • T. Weaver
Article

Abstract

Nutrient retention in ecosystems requires synchrony between the supply of bioavailable nutrients released via mineralization and nutrient uptake by plants. Though disturbance and chronic nutrient loading are known to alter nitrogen (N) and phosphorus (P) dynamics and induce nutrient export, whether long-term shifts in climate affect source-sink synchrony, and ultimately primary productivity, remains uncertain. This is particularly true for snow-dominated ecosystems, which are naturally subject to lags between nutrient inputs and uptake. To address how climate change may affect nutrient source-sink synchrony we examined the impacts of deepened snowpack on N and P losses in a subalpine grassland in the Northern Rocky Mountains, USA, where we have experimentally increased snowpack depths by two- and four-times ambient snow for 45 years. Long-term snow addition resulted in remarkably high levels of bioavailable-N leaching (up to 16 kg ha−1 year−1) that were 11–80 times higher than those under ambient snowpack. Estimated bioavailable-P losses also increased with snow addition, but to a lesser degree (up to 0.3 kg ha−1 year−1), indicating greater enhancement of N losses over P losses during snowmelt. Because these losses could not be explained by changes in nutrient inputs in snowpack or by changes in plant-soil turnover, our results suggest that high bioavailable-N leaching under deep snowpack originates not from a lack of N limitation of plant productivity, but rather from enhanced subnivean microbial processes followed by snowmelt leaching prior to the growing season. This is supported by reduced soil N pools in the snow treatments. Snow-dominated regions are projected to experience shifts in seasonal snowpack regime. These shifts may ultimately affect the stoichiometric balance between available N and P and future plant productivity.

Keywords

Climate change Grassland Nitrogen cycle Nutrient leaching Phosphorus cycle Snowmelt Nutrient stoichiometry 

Abbreviations

BTL

Bangtail study area

DIN

Dissolved inorganic nitrogen

DON

Dissolved organic nitrogen

SWE

Snow-water equivalent

TDN

Total dissolved nitrogen

Notes

Acknowledgments

We thank E. Adams for helpful comments on melt water flux estimates; T. Bogen and K. Mildenberger for assistance in sample collection and chemical analyses; and P. Stoy for meteorological equipment and advice. This research was supported by Grants from the Montana Agricultural Experiment Station to E.N.J. Brookshire and from Montana Institute on Ecosystems’ award from NSF EPSCoR Track-1 EPS-1 101 342 and EPS-IIA-1443108 (INSTEP 3) under Grant W3937.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Y. Yano
    • 1
    • 2
    Email author
  • E. N. J. Brookshire
    • 1
  • J. Holsinger
    • 1
  • T. Weaver
    • 2
  1. 1.Department of Land, Resources & Environmental SciencesMontana State UniversityBozemanUSA
  2. 2.Department of EcologyMontana State UniversityBozemanUSA

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