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Plant and microbial...
Plant and microbial responses to nitrogen and phosphorus addition across an elevational gradient in subarctic tundra
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- Sundqvist, Maja K. (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden,Arcum,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Liu, Zhanfeng (författare)
- Chinese Acad Sci, South China Bot Garden, Key Lab Vegetat Restorat & Management Degraded Ec, Guangzhou 510650, Guangdong, Peoples R China
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- Giesler, Reiner (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Arcum,Umeå University
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- Wardle, David (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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(creator_code:org_t)
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- Wiley, 2014
- 2014
- Engelska.
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Ingår i: Ecology. - : Wiley. - 0012-9658 .- 1939-9170. ; 95:7, s. 1819-1835
- Relaterad länk:
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https://umu.diva-por... (primary) (Raw object)
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http://umu.diva-port...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Ämnesord
Stäng
- Temperature and nutrients are major limiting factors in subarctic tundra. Experimental manipulation of nutrient availability along elevational gradients (and thus temperature) can improve our understanding of ecological responses to climate change. However, no study to date has explored impacts of nutrient addition along a tundra elevational gradient, or across contrasting vegetation types along any elevational gradient. We set up a full factorial nitrogen (N) and phosphorus (P) fertilization experiment in each of two vegetation types (heath and meadow) at 500 m, 800 m, and 1000 m elevation in northern Swedish tundra. We predicted that plant and microbial communities in heath or at lower elevations would be more responsive to N addition while communities in meadow or at higher elevations would be more responsive to P addition, and that fertilizer effects would vary more with elevation for the heath than for the meadow. Although our results provided little support for these predictions, the relationship between nutrient limitation and elevation differed between vegetation types. Most plant and microbial properties were responsive to N and/or P fertilization, but responses often varied with elevation and/or vegetation type. For instance, vegetation density significantly increased with N + P fertilization relative to the other fertilizer treatments, and this increase was greatest at the lowest elevation for the heath but at the highest elevation for the meadow. Arbuscular mycorrhizae decreased with P fertilization at 500 m for the meadow, but with all fertilizer treatments in both vegetation types at 800 m. Fungal to bacterial ratios were enhanced by N + P fertilization for the two highest elevations in the meadow only. Additionally, microbial responses to fertilization were primarily direct rather than indirect via plant responses, pointing to a decoupled response of plant and microbial communities to nutrient addition and elevation. Because our study shows how two community types differ in their responses to fertilization and elevation, and because the temperature range across this gradient is similar to 3 degrees C, our study is informative about how nutrient limitation in tundra may be influenced by temperature shifts that are comparable to those expected under climate change during this century.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)
Nyckelord
- above- and belowground communities
- fertilization experiment
- fungal-to-bacterial ratios
- global warming
- plant functional groups
- plant-soil linkages
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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