Long-term reindeer grazing limits warming-induced increases in CO 2 released by tundra heath soil: potential role of soil C quality. Väisänen, M., Sjögersten, S., Large, D., Drage, T., & Stark, S. Environmental Research Letters, 10(9):094020, 2015. ![Long-term reindeer grazing limits warming-induced increases in CO 2 released by tundra heath soil: potential role of soil C quality [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The current climate warming in the Arctic may increase the microbial degradation of vast pools of soil carbon (C); however, the temperature sensitivity of decomposition is often highly dependent on the quality of accumulated soil C. Grazing by reindeer ( Rangifer tarandus L.) substantially affects the dominant vegetation and often increases graminoids in relation to dwarf shrubs in ecosystems, but the effect of this vegetation shift on the soil C quality has not been previously investigated. We analyzed the soil C quality and rate of microbially mediated CO 2 release at different temperatures in long-term laboratory incubations using soils from lightly grazed dwarf shrub-dominated and heavily grazed graminoid-dominated tundra ecosystem. The soil C quality was characterized by solid-state cross-polarization magic angle spinning (CPMAS 13 C NMR) spectroscopy, which showed a higher relative proportion of carbohydrate C under light grazing and higher relative proportion of aliphatic not-O-substituted C under heavy grazing. Initial measurements showed lower temperature sensitivity of the CO 2 release in soils under light grazing compared with soil under heavy grazing, but the overall CO 2 release rate and its temperature sensitivity increased under light grazing as the soil incubation progressed. At the end of incubation, significantly more carbohydrate C had been lost in soils under light grazing compared with heavy grazing. These findings indicate that there may be a link between the grazer-induced effects on soil C quality and the potential of soils to release CO 2 to atmosphere. We suggest that vegetation shifts induced by grazing could influence the proportion of accumulated soil C that is vulnerable to microbial degradation under warming climate.
@article{vaisanen_long-term_2015,
title = {Long-term reindeer grazing limits warming-induced increases in {CO} 2 released by tundra heath soil: potential role of soil {C} quality},
volume = {10},
issn = {1748-9326},
shorttitle = {Long-term reindeer grazing limits warming-induced increases in {CO} 2 released by tundra heath soil},
url = {http://stacks.iop.org/1748-9326/10/i=9/a=094020},
doi = {10.1088/1748-9326/10/9/094020},
abstract = {The current climate warming in the Arctic may increase the microbial degradation of vast pools of soil carbon (C); however, the temperature sensitivity of decomposition is often highly dependent on the quality of accumulated soil C. Grazing by reindeer ( Rangifer tarandus L.) substantially affects the dominant vegetation and often increases graminoids in relation to dwarf shrubs in ecosystems, but the effect of this vegetation shift on the soil C quality has not been previously investigated. We analyzed the soil C quality and rate of microbially mediated CO 2 release at different temperatures in long-term laboratory incubations using soils from lightly grazed dwarf shrub-dominated and heavily grazed graminoid-dominated tundra ecosystem. The soil C quality was characterized by solid-state cross-polarization magic angle spinning (CPMAS 13 C NMR) spectroscopy, which showed a higher relative proportion of carbohydrate C under light grazing and higher relative proportion of aliphatic not-O-substituted C under heavy grazing. Initial measurements showed lower temperature sensitivity of the CO 2 release in soils under light grazing compared with soil under heavy grazing, but the overall CO 2 release rate and its temperature sensitivity increased under light grazing as the soil incubation progressed. At the end of incubation, significantly more carbohydrate C had been lost in soils under light grazing compared with heavy grazing. These findings indicate that there may be a link between the grazer-induced effects on soil C quality and the potential of soils to release CO 2 to atmosphere. We suggest that vegetation shifts induced by grazing could influence the proportion of accumulated soil C that is vulnerable to microbial degradation under warming climate.},
language = {en},
number = {9},
urldate = {2017-05-27},
journal = {Environmental Research Letters},
author = {Väisänen, Maria and Sjögersten, Sofie and Large, David and Drage, Trevor and Stark, Sari},
year = {2015},
keywords = {\#nosource},
pages = {094020},
}
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Grazing by reindeer ( Rangifer tarandus L.) substantially affects the dominant vegetation and often increases graminoids in relation to dwarf shrubs in ecosystems, but the effect of this vegetation shift on the soil C quality has not been previously investigated. We analyzed the soil C quality and rate of microbially mediated CO 2 release at different temperatures in long-term laboratory incubations using soils from lightly grazed dwarf shrub-dominated and heavily grazed graminoid-dominated tundra ecosystem. The soil C quality was characterized by solid-state cross-polarization magic angle spinning (CPMAS 13 C NMR) spectroscopy, which showed a higher relative proportion of carbohydrate C under light grazing and higher relative proportion of aliphatic not-O-substituted C under heavy grazing. 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