Supplementary material to "Cushion bog plant community responses to passive warming in southern Patagonia"

Abstract. Vascular plant-dominated cushion bogs, which are exclusive to the Southern Hemisphere, are highly productive and constitute large sinks for atmospheric carbon dioxide compared to their moss-dominated counterparts around the globe. In this study, we experimentally investigated how a cushion bog plant community responded to elevated surface temperature conditions as they are predicted to occur in a future climate. We conducted the study in a cushion bog dominated by Astelia pumila on Tierra del Fuego, Argentina. We installed a year-round passive warming experiment using semicircular plastic walls that raised average near-surface air temperatures by between 0.4 and 0.7 ∘C (at the 3 of the 10 treatment plots which were equipped with temperature sensors). We focused on characterizing differences in morphological cushion plant traits and in carbon dioxide exchange dynamics using chamber gas flux measurements. We used a mechanistic modeling approach to quantify physiological plant traits and to partition the net carbon dioxide flux into its two components of photosynthesis and total ecosystem respiration. We found that A. pumila reduced its photosynthetic activity under elevated temperatures. At the same time, we observed enhanced respiration which we largely attribute, due to the limited effect of our passive warming on soil temperatures, to an increase in autotrophic respiration. Passively warmed A. pumila cushions sequestered between 55 % and 85 % less carbon dioxide than untreated control cushions over the main growing season. Our results suggest that even moderate future warming under the SSP1-2.6 scenario could decrease the carbon sink function of austral cushion bogs.

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Cushion bog plant community responses to passive warming in southern Patagonia

10.5194/bg-2020-440 ◽

2020 ◽

Author(s):

Verónica Pancotto ◽

David Holl ◽

Julio Escobar ◽

María Florencia Castagnani ◽

Lars Kutzbach

Keyword(s):

Carbon Dioxide ◽

Plant Community ◽

Plant Traits ◽

Ecosystem Respiration ◽

Vascular Plant ◽

Carbon Dioxide Flux ◽

Tierra Del Fuego ◽

Near Surface ◽

Passive Warming ◽

Southern Patagonia

Abstract. Vascular plant-dominated cushion bogs, which are exclusive to the southern hemisphere, are highly productive and constitute large sinks for atmospheric carbon dioxide compared to their moss-dominated counterparts around the globe. In this study, we experimentally investigated how a cushion bog plant community responded to elevated surface temperature conditions as they are predicted to occur in a future climate. We conducted the study in a cushion bog dominated by Astelia pumila on Tierra del Fuego, Argentina. We installed a year-round passive warming experiment using semicircular plastic walls that raised average near-surface air temperatures between 0.4 °C and 0.7 °C (n = 3). We focused on characterizing differences in morphological cushion plant traits and in carbon dioxide exchange dynamics using chamber gas flux measurements. We used a mechanistic modeling approach to quantify physiological plant traits and to partition the net carbon dioxide flux into its two components photosynthesis and total ecosystem respiration. We found that A. pumila reduced its photosynthetic activity under elevated temperatures. At the same time, we observed enhanced respiration which we largely attribute, due to the limited effect of our passive warming on soil temperatures, to an increase in autotrophic respiration. Passively warmed A. pumila cushions sequestered between 55 % and 85 % less carbon dioxide than untreated control cushions over the main growing season. These results suggest that future warming could decrease the carbon sink function of austral cushion bogs.

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Soil microbial and plant community responses to single large carbon and nitrogen additions in low arctic tundra

Plant and Soil ◽

10.1007/s11104-010-0392-4 ◽

2010 ◽

Vol 334 (1-2) ◽

pp. 409-421 ◽

Cited By ~ 20

Author(s):

Carolyn Churchland ◽

Liesha Mayo-Bruinsma ◽

Alison Ronson ◽

Paul Grogan

Keyword(s):

Plant Community ◽

Arctic Tundra ◽

Community Responses ◽

Carbon And Nitrogen ◽

Soil Microbial ◽

Low Arctic ◽

Nitrogen Additions

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Scaling Submersed Plant Community Responses to Experimental Nutrient Enrichment

Seagrasses - Marine Science ◽

10.1201/9781420074475.sec4 ◽

1999 ◽

pp. 241-257

Author(s):

Laura Murray ◽

R Brian Sturgis ◽

Richard Bartleson ◽

William Severn ◽

W Michael Kemp

Keyword(s):

Plant Community ◽

Nutrient Enrichment ◽

Community Responses

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Understanding Plant Community Responses to Combinations of Biotic and Abiotic Factors in Different Phases of the Plant Growth Cycle

PLoS ONE ◽

10.1371/journal.pone.0049824 ◽

2012 ◽

Vol 7 (11) ◽

pp. e49824 ◽

Cited By ~ 28

Author(s):

Kevin A. Wood ◽

Richard A. Stillman ◽

Ralph T. Clarke ◽

Francis Daunt ◽

Matthew T. O’Hare

Keyword(s):

Plant Growth ◽

Plant Community ◽

Abiotic Factors ◽

Growth Cycle ◽

Community Responses ◽

Biotic And Abiotic Factors

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Spatial heterogeneity in species composition constrains plant community responses to herbivory and fertilisation

Ecology Letters ◽

10.1111/ele.13102 ◽

2018 ◽

Vol 21 (9) ◽

pp. 1364-1371 ◽

Cited By ~ 10

Author(s):

Dorothee Hodapp ◽

Elizabeth T. Borer ◽

W. Stanley Harpole ◽

Eric M. Lind ◽

Eric W. Seabloom ◽

...

Keyword(s):

Species Composition ◽

Spatial Heterogeneity ◽

Plant Community ◽

Community Responses

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Grassland reclamation of a copper mine tailings facility: Long term effects of biosolids on plant community responses

Applied Vegetation Science ◽

10.1111/avsc.12612 ◽

2021 ◽

Author(s):

Alyson Gagnon ◽

Laura W. Ploughe ◽

Michelle P. Harris ◽

Wendy C. Gardner ◽

Thomas Pypker ◽

...

Keyword(s):

Plant Community ◽

Mine Tailings ◽

Long Term Effects ◽

Community Responses ◽

Copper Mine ◽

Copper Mine Tailings

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Plant Community Responses to Disturbance by Mechanized Military Maneuvers

Journal of Environmental Quality ◽

10.2134/jeq1999.00472425002800050019x ◽

1999 ◽

Vol 28 (5) ◽

pp. 1533-1547 ◽

Cited By ~ 33

Author(s):

Daniel G. Milchunas ◽

Keith A. Schulz ◽

Robert B. Shaw

Keyword(s):

Plant Community ◽

Community Responses

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Opposing plant community responses to warming with and without herbivores

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.0802421105 ◽

2008 ◽

Vol 105 (34) ◽

pp. 12353-12358 ◽

Cited By ~ 326

Author(s):

E. Post ◽

C. Pedersen

Keyword(s):

Plant Community ◽

Community Responses

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Recent Research Indicates Plant Community Responses to Intensive Treatment Including Chemical Amendments

Southern Journal of Applied Forestry ◽

10.1093/sjaf/13.3.152 ◽

1989 ◽

Vol 13 (3) ◽

pp. 152-156 ◽

Cited By ~ 4

Author(s):

Benee F. Swindel ◽

Joel E. Smith ◽

Daniel G. Neary ◽

Nicholas B. Comerford

Keyword(s):

Plant Community ◽

Loblolly Pine ◽

Pinus Elliottii ◽

Plant Species Richness ◽

Moisture Gradient ◽

Moisture Regime ◽

Community Responses ◽

Crown Cover ◽

Competition Control ◽

Pinus Taeda L

Abstract Plant community responses to several factors (planted species, competition control, and nutrients) that influence stand development were tested in a factorial experiment on a flatwoods Spodosol. A moisture gradient across replications, augmented by irrigation, permitted testing of afourth factor (moisture regime). There were differences between slash pine (Pinus elliottii var. elliottii Engelm.) and loblolly pine (Pinus taeda L.) crown development, but no response to moisture gradient. Pines and other plants responded dramatically to continuing competition control andrepeated fertilization. Nonpine crown cover was reduced from 100% on plots without herbicides to less than 10% on treated plots. Pine crown cover at 5 years averaged 73% with both fertilization and competition control versus 11% on control plots. Both pine and nonpine cover changed significantlyacross bed, furrow, and interbed niches, and niche interacted with chemical (fertilizer and herbicide) treatment. Competition control dramatically reduced plant species richness; modal number of species observed on 5 m transects was reduced from 10 on plots without herbicides to 2 on plotsrepeatedly treated. South. J. Appl. For. 13(3):152-156.

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