Soils beneath different arctic shrubs have contrasting responses to a natural gradient in temperature
| Autor: | Qiong Zhao, Maja K. Sundqvist, Aimée T. Classen, Gregory S. Newman |
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| Rok vydání: | 2018 |
| Předmět: |
Ekologi
0106 biological sciences 010504 meteorology & atmospheric sciences Ecology Global warming food and beverages Climate change global warming 010603 evolutionary biology 01 natural sciences The arctic shrub species Arctic ericoid mycorrhizae ectomycorrhizae Soil water biochemical processes Environmental science Dominance (ecology) Soil properties Natural gradient Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Zhao, Q, Sundqvist, M, Newman, G S & Classen, A T 2018, ' Soils beneath different arctic shrubs have contrasting responses to a natural gradient in temperature ', Ecosphere, vol. 9, no. 6, e02290 . https://doi.org/10.1002/ecs2.2290 |
| ISSN: | 2150-8925 |
| Popis: | Shrubs commonly form islands of fertility and are expanding their distribution and dominance in the arctic due to climate change, yet how soil properties may be influenced when different species of shrubs expand under warmer climates remains less explored. Important plant traits, such as their associated root community, are linked to functionally different and dominant shrub species in the arctic and these traits likely shape biogeochemical cycling in areas of shrub expansion. Using an elevational gradient as a proxy for warming, we explored how biochemical processes beneath two important arctic shrubs varied under warmer (low elevation) and cooler (high elevation) climates. Interestingly, the influence of elevation on biogeochemistry varied between the two shrubs. At the low elevation, Betula nana L., an ectomycorrhizal shrub, had high carbon (C) degrading enzyme activities, and relatively low potential net nitrogen (N) mineralization rates. Conversely, Empetrum nigrum ssp. hermaphroditum Hagerup, an cricoid mycorrhizal dwarf-shrub, had higher enzyme activities and net N immobilization rates at the higher elevation. Further, E. nigrum ssp. hermpahroditum appeared to have a more closed C and nutrient cycle than B. nana-enzymes degrading C, N, and phosphorus were tightly correlated with each other and with total C and ammonium concentrations in the humus beneath E. nigrum ssp. hermaphroditum, but not beneath B. nana. Our results suggest differences in the warming responses of C and N cycling beneath shrub species across an arctic tundra landscape. |
| Databáze: | OpenAIRE |
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