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Winter climate change affects growing-season soil microbial biomass and activity in northern hardwood forestsAuthor(s): Jorge Durán; Jennifer L. Morse; Peter M. Groffman; John L. Campbell; Lynn M. Christenson; Charles T. Driscoll; Timothy J. Fahey; Melany C. Fisk; Myron J. Mitchell; Pamela H. Templer
Source: Global Change Biology. 20(11): 3568-3577.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
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DescriptionUnderstanding the responses of terrestrial ecosystems to global change remains a major challenge of ecological research. We exploited a natural elevation gradient in a northern hardwood forest to determine how reductions in snow accumulation, expected with climate change, directly affect dynamics of soil winter frost, and indirectly soil microbial biomass and activity during the growing season. Soils from lower elevation plots, which accumulated less snow and experienced more soil temperature variability during the winter (and likely more freeze/thaw events), had less extractable inorganic nitrogen (N), lower rates of microbial N production via potential net N mineralization and nitrification, and higher potential microbial respiration during the growing season. Potential nitrate production rates during the growing season were particularly sensitive to changes in winter snow pack accumulation and winter soil temperature variability, especially in spring. Effects of elevation and winter conditions on N transformation rates differed from those on potential microbial respiration, suggesting that N-related processes might respond differently to winter climate change in northern hardwood forests than C-related processes.
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CitationDurán, Jorge; Morse, Jennifer L.; Groffman, Peter M.; Campbell, John L.; Christenson, Lynn M.; Driscoll, Charles T.; Fahey, Timothy J.; Fisk, Melany C.; Mitchell, Myron J.; Templer, Pamela H. 2014. Winter climate change affects growing-season soil microbial biomass and activity in northern hardwood forests. Global Change Biology. 20(11): 3568-3577.
Keywordscarbon, global change, microbial respiration, mineralization, nitrification, nitrogen, soil frost
- Climate change decreases nitrogen pools and mineralization rates in northern hardwood forests
- Nitrate and dissolved organic carbon mobilization in response to soil freezing variability
- Differential sensitivity to climate change of C and N cycling processes across soil horizons in a northern hardwood forest
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