plant competition for nutrients in a phosphorus-limited ...€¦ · plant competition for nutrients...
TRANSCRIPT
![Page 1: Plant competition for nutrients in a phosphorus-limited ...€¦ · Plant competition for nutrients in a phosphorus-limited tundra ecosystem. Emily Pickering Pedersen. Joseph Gaudard,](https://reader036.vdocument.in/reader036/viewer/2022071216/6046b310b4c32d79894c9bb6/html5/thumbnails/1.jpg)
Plant competition for nutrients in a phosphorus-limited tundra ecosystem
Emily Pickering PedersenJoseph Gaudard, Bo Elberling, Anders Michelsen
ITEX meeting 2019, Parma, Italy
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Temperature
Arctic tundra ecosystems
Belowground changes
Plants
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Temperature
Arctic tundra ecosystems
Belowground changes
Plants
Increased decomposition →
Increased nutrient availability
Plant species community
Ecosystem functions
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Temperature
Arctic tundra ecosystems
Belowground changes
Plants
Increased decomposition →
Increased nutrient availability
Plant species community
Ecosystem functions
OrganicN
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Nutrient availability and uptake
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Nutrient availability and uptake
Abiotic factors↓
Precipitation
Bintanja & Andry, 2017
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Nutrient availability and uptake
Geology↓
P-limitation
Bintanja & Andry, 2017
Abiotic factors↓
Precipitation
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Nutrient availability and uptake
Geology↓
P-limitation
Microorganisms
Biotic interactions↓
Competition
Bintanja & Andry, 2017
Abiotic factors↓
Precipitation
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Nutrient availability and uptake
1. Does increased summer precipitation alter plant N uptake?
2. Does P-limitation restrict plant N uptake?
3. What are the patterns of plant-plant and plant-microbe competition for nutrients?
Precipitation P-limitation Competition
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Field location
Disko Island, Greenland69°14’ N 53°32’ W
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Experimental design
PH2O
• Full factorial design• 8 mm precipitation/week• 10 g P/m2 (growing season)
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Experimental design
PH2O
• Full factorial design• 8 mm precipitation/week• 10 g P/m2 (growing season)
Amino acid(glycine)
13C15N(0-10 cm depth)
Microbes
Plants
Ecosystem
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Data Slides Removed
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Conclusions
1. Increased precipitation reduces plant N uptake → plant stress
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Conclusions
1. Increased precipitation reduces plant N uptake → plant stress
2. P accumulates, but limitation effects are unclear
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Conclusions
1. Increased precipitation reduces plant N uptake → plant stress
2. P accumulates, but limitation effects are unclear
3. Plant-plant and plant-microbe competition is apparent → species community change
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Thank you