Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic. Hicks, L. C., Leizeaga, A., Rousk, K., Michelsen, A., & Rousk, J. Ecology, n/a(n/a):e03094, May, 2020. _eprint: https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.3094![Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Climate change is exposing high-latitude systems to warming and a shift towards more shrub-dominated plant communities, resulting in increased leaf-litter inputs at the soil surface, and more labile root-derived organic matter (OM) input in the soil profile. Labile OM can stimulate the mineralization of soil organic matter (SOM); a phenomenon termed “priming”. In N-poor subarctic soils, it is hypothesized that microorganisms may “prime” SOM in order to acquire N (“microbial N-mining”). Increased leaf-litter inputs with a high C/N ratio might further exacerbate microbial N demand, and increase the susceptibility of N-poor soils to N-mining. We investigated the N-control of SOM mineralization by amending soils from climate change simulation treatments in the subarctic (+1.1°C warming, birch litter addition, willow litter addition, and fungal sporocarp addition) with labile OM either in the form of glucose (labile C; equivalent to 400 µg C g-1 fwt soil) or alanine (labile C + N; equivalent to 400 µg C and 157 µg N g-1 fwt soil), to simulate rhizosphere inputs. Surprisingly, we found that despite five-years of simulated climate change treatments, there were no significant effects of the field-treatments on microbial process rates, community structure or responses to labile OM. Glucose primed the mineralization of both C and N from SOM, but gross mineralization of N was stimulated more than that of C, suggesting that microbial SOM-use increased in magnitude and shifted to components richer in N (i.e. selective microbial N-mining). The addition of alanine also resulted in priming of both C and N mineralization, but the N mineralization stimulated by alanine was greater than that stimulated by glucose, indicating strong N-mining even when a source of labile OM including N was supplied. Microbial carbon use efficiency was reduced in response to both labile OM inputs. Overall, these findings suggest that shrub-expansion could fundamentally alter biogeochemical cycling in the subarctic, yielding more N available for plant uptake in these N-limited soils, thus driving positive plant-soil feedbacks.
@article{hicks_simulated_2020,
title = {Simulated rhizosphere deposits induce microbial {N}-mining that may accelerate shrubification in the subarctic},
volume = {n/a},
copyright = {This article is protected by copyright. All rights reserved.},
issn = {1939-9170},
url = {https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1002/ecy.3094},
doi = {10.1002/ecy.3094},
abstract = {Climate change is exposing high-latitude systems to warming and a shift towards more shrub-dominated plant communities, resulting in increased leaf-litter inputs at the soil surface, and more labile root-derived organic matter (OM) input in the soil profile. Labile OM can stimulate the mineralization of soil organic matter (SOM); a phenomenon termed “priming”. In N-poor subarctic soils, it is hypothesized that microorganisms may “prime” SOM in order to acquire N (“microbial N-mining”). Increased leaf-litter inputs with a high C/N ratio might further exacerbate microbial N demand, and increase the susceptibility of N-poor soils to N-mining. We investigated the N-control of SOM mineralization by amending soils from climate change simulation treatments in the subarctic (+1.1°C warming, birch litter addition, willow litter addition, and fungal sporocarp addition) with labile OM either in the form of glucose (labile C; equivalent to 400 µg C g-1 fwt soil) or alanine (labile C + N; equivalent to 400 µg C and 157 µg N g-1 fwt soil), to simulate rhizosphere inputs. Surprisingly, we found that despite five-years of simulated climate change treatments, there were no significant effects of the field-treatments on microbial process rates, community structure or responses to labile OM. Glucose primed the mineralization of both C and N from SOM, but gross mineralization of N was stimulated more than that of C, suggesting that microbial SOM-use increased in magnitude and shifted to components richer in N (i.e. selective microbial N-mining). The addition of alanine also resulted in priming of both C and N mineralization, but the N mineralization stimulated by alanine was greater than that stimulated by glucose, indicating strong N-mining even when a source of labile OM including N was supplied. Microbial carbon use efficiency was reduced in response to both labile OM inputs. Overall, these findings suggest that shrub-expansion could fundamentally alter biogeochemical cycling in the subarctic, yielding more N available for plant uptake in these N-limited soils, thus driving positive plant-soil feedbacks.},
language = {en},
number = {n/a},
urldate = {2020-05-29},
journal = {Ecology},
author = {Hicks, Lettice C. and Leizeaga, Ainara and Rousk, Kathrin and Michelsen, Anders and Rousk, Johannes},
month = may,
year = {2020},
note = {\_eprint: https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.3094},
keywords = {\#nosource, carbon and nitrogen mineralization, climate change, microbial carbon use efficiency, nitrogen limitation, nitrogen-mining, rhizosphere biogeochemistry, soil priming effect, subarctic tundra},
pages = {e03094},
}
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Labile OM can stimulate the mineralization of soil organic matter (SOM); a phenomenon termed “priming”. In N-poor subarctic soils, it is hypothesized that microorganisms may “prime” SOM in order to acquire N (“microbial N-mining”). Increased leaf-litter inputs with a high C/N ratio might further exacerbate microbial N demand, and increase the susceptibility of N-poor soils to N-mining. We investigated the N-control of SOM mineralization by amending soils from climate change simulation treatments in the subarctic (+1.1°C warming, birch litter addition, willow litter addition, and fungal sporocarp addition) with labile OM either in the form of glucose (labile C; equivalent to 400 µg C g-1 fwt soil) or alanine (labile C + N; equivalent to 400 µg C and 157 µg N g-1 fwt soil), to simulate rhizosphere inputs. Surprisingly, we found that despite five-years of simulated climate change treatments, there were no significant effects of the field-treatments on microbial process rates, community structure or responses to labile OM. Glucose primed the mineralization of both C and N from SOM, but gross mineralization of N was stimulated more than that of C, suggesting that microbial SOM-use increased in magnitude and shifted to components richer in N (i.e. selective microbial N-mining). The addition of alanine also resulted in priming of both C and N mineralization, but the N mineralization stimulated by alanine was greater than that stimulated by glucose, indicating strong N-mining even when a source of labile OM including N was supplied. Microbial carbon use efficiency was reduced in response to both labile OM inputs. 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All rights reserved.},\n\tissn = {1939-9170},\n\turl = {https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1002/ecy.3094},\n\tdoi = {10.1002/ecy.3094},\n\tabstract = {Climate change is exposing high-latitude systems to warming and a shift towards more shrub-dominated plant communities, resulting in increased leaf-litter inputs at the soil surface, and more labile root-derived organic matter (OM) input in the soil profile. Labile OM can stimulate the mineralization of soil organic matter (SOM); a phenomenon termed “priming”. In N-poor subarctic soils, it is hypothesized that microorganisms may “prime” SOM in order to acquire N (“microbial N-mining”). Increased leaf-litter inputs with a high C/N ratio might further exacerbate microbial N demand, and increase the susceptibility of N-poor soils to N-mining. We investigated the N-control of SOM mineralization by amending soils from climate change simulation treatments in the subarctic (+1.1°C warming, birch litter addition, willow litter addition, and fungal sporocarp addition) with labile OM either in the form of glucose (labile C; equivalent to 400 µg C g-1 fwt soil) or alanine (labile C + N; equivalent to 400 µg C and 157 µg N g-1 fwt soil), to simulate rhizosphere inputs. Surprisingly, we found that despite five-years of simulated climate change treatments, there were no significant effects of the field-treatments on microbial process rates, community structure or responses to labile OM. Glucose primed the mineralization of both C and N from SOM, but gross mineralization of N was stimulated more than that of C, suggesting that microbial SOM-use increased in magnitude and shifted to components richer in N (i.e. selective microbial N-mining). The addition of alanine also resulted in priming of both C and N mineralization, but the N mineralization stimulated by alanine was greater than that stimulated by glucose, indicating strong N-mining even when a source of labile OM including N was supplied. Microbial carbon use efficiency was reduced in response to both labile OM inputs. 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