A net ecosystem carbon budget for snow dominated forested headwater catchments: linking water and carbon fluxes to critical zone carbon storage

Autor:	Jon Chorover, M. Holleran, Tyson L. Swetnam, Angélica Vázquez-Ortega, Marcy E. Litvak, David Huckle, Clare Stielstra, Patrick D. Broxton, Rebecca A. Lybrand, Adrian A. Harpold, Thomas Meixner, Julia Perdrial, Jon D. Pelletier, Paul D. Brooks, Caitlin A. Orem, Bhaskar Mitra, Kathleen A. Lohse, Xavier Zapata-Rios, Craig Rasmussen, Kate Condon
Rok vydání:	2018
Předmět:	Hydrology geography Biomass (ecology) geography.geographical_feature_category 010504 meteorology & atmospheric sciences Soil organic matter 0208 environmental biotechnology Drainage basin 02 engineering and technology Seasonality medicine.disease Snow 01 natural sciences 020801 environmental engineering medicine Environmental Chemistry Environmental science Ecosystem Precipitation Water cycle 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology
Zdroj:	Biogeochemistry. 138:225-243
ISSN:	1573-515X 0168-2563
DOI:	10.1007/s10533-018-0440-3
Popis:	Climate-driven changes in carbon (C) cycling of forested ecosystems have the potential to alter long-term C sequestration and the global C balance. Prior studies have shown that C uptake and partitioning in response to hydrologic variation are system specific, suggesting that a comprehensive assessment is required for distinct ecosystems. Many sub-humid montane forest ecosystems in the US are projected to experience increased water limitation over the next decades and existing water-limited forests can be used as a model for how changes in the hydrologic cycle will impact such ecosystems more broadly. Toward that goal we monitored precipitation, net ecosystem exchange and lateral soil and stream C fluxes in three semi-arid to sub-humid montane forest catchments for several years (WY 2009–2013) to investigate how the amount and timing of water delivery affect C stores and fluxes. The key control on aqueous and gaseous C fluxes was the distribution of water between winter and summer precipitation, affecting ecosystem C uptake versus heterotrophic respiration. We furthermore assessed C stores in soil and above- and below-ground biomass to assess how spatial patterns in water availability influence C stores. Topographically-driven patterns in catchment wetness correlated with modeled soil C stores, reflecting both long-term trends in local C uptake as well as lateral redistribution of C leached from upslope organic soil horizons to convergent landscape positions. The results suggest that changes in the seasonality of precipitation from winter snow to summer rain will influence both the amount and the spatial distribution of soil C stores.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::99561df35c5c00222dd0cc791103c887 https://doi.org/10.1007/s10533-018-0440-3 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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