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Soil nitrogen cycle...
Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland
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- Rütting, Tobias, 1977 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences
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Hovenden, M. J. (författare)
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(creator_code:org_t)
- 2019-12-10
- 2020
- Engelska.
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Ingår i: Biogeochemistry. - : Springer Science and Business Media LLC. - 0168-2563 .- 1573-515X. ; 147:1, s. 99-107
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Abstract
Ämnesord
Stäng
- Increases in atmospheric carbon dioxide (CO2) and global air temperature affect all terrestrial ecosystems and often lead to enhanced ecosystem productivity, which in turn dampens the rise in atmospheric CO2 by removing CO2 from the atmosphere. As most terrestrial ecosystems are limited in their productivity by the availability of nitrogen (N), there is concern about the persistence of this terrestrial carbon sink, as these ecosystems might develop a progressive N limitation (PNL). An increase in the gross soil N turnover may alleviate PNL, as more mineral N is made available for plant uptake. So far, climate change experiments have mainly manipulated one climatic factor only, but there is evidence that single-factor experiments usually overestimate the effects of climate change on terrestrial ecosystems. In this study, we investigated how simultaneous, decadal-long increases in CO2 and temperature affect the soil gross N dynamics in a native Tasmanian grassland under C3 and C4 vegetation. Our laboratory N-15 labeling experiment showed that average gross N mineralization ranged from 4.9 to 11.3 mu g N g(-1) day(-1) across the treatment combinations, while gross nitrification was about ten-times lower. Considering all treatment combinations, no significant effect of climatic treatments or vegetation type (C3 versus C4 grasses) on soil N cycling was observed.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Elevated CO2
- Warming
- Gross mineralization
- Gross nitrification
- Nutrient limitation
- elevated co2
- carbon-dioxide
- temperate
- mineralization
- limitation
- responses
- dynamics
- productivity
- enhancement
- impacts
- Environmental Sciences & Ecology
- Geology
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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