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You searched for: Journal Global change biology Remove constraint Journal: Global change biology Publication Year 2012 Remove constraint Publication Year: 2012 Source 2012 v.18 no.10 Remove constraint Source: 2012 v.18 no.10 Subject carbon dioxide Remove constraint Subject: carbon dioxide
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1. Carbon isotope evidence for recent climate‐related enhancement of CO 2 assimilation and peat accumulation rates in Antarctica

Author:
Royles, Jessica; Ogée, Jérôme; Wingate, Lisa; Hodgson, Dominic A.; Convey, Peter; Griffiths, Howard
Source:
Global change biology 2012 v.18 no.10 pp. 3112-3124
ISSN:
1354-1013
Subject:
Sphagnum; anthropogenic activities; carbon; carbon dioxide; cellulose; growing season; models; mosses and liverworts; peat; photosynthesis; radiocarbon dating; radionuclides; stable isotopes; temperature; Antarctic region; Antarctica
Abstract:
... Signy Island, maritime Antarctic, lies within the region of the Southern Hemisphere that is currently experiencing the most rapid rates of environmental change. In this study, peat cores up to 2 m in depth from four moss banks on Signy Island were used to reconstruct changes in moss growth and climatic characteristics over the late Holocene. Measurements included radiocarbon dating (to determine p ...
DOI:
10.1111/j.1365-2486.2012.02750.x

2. High arctic heath soil respiration and biogeochemical dynamics during summer and autumn freeze‐in – effects of long‐term enhanced water and nutrient supply

Author:
Christiansen, Casper T.; Svendsen, Sarah H.; Schmidt, Niels M.; Michelsen, Anders
Source:
Global change biology 2012 v.18 no.10 pp. 3224-3236
ISSN:
1354-1013
Subject:
autumn; carbon; carbon dioxide; carbon sinks; ecosystems; growing season; long term effects; microbial activity; microbial biomass; microorganisms; nitrogen; nutrient availability; phosphorus; soil biota; soil organic matter; soil respiration; soil water; summer; temperature; tundra; water supply; Arctic region; Greenland
Abstract:
... In High Arctic NE Greenland, temperature and precipitation are predicted to increase during this century, however, relatively little information is available on the role of increased water supply on soil CO ₂ efflux in dry, high arctic ecosystems. We measured soil respiration (Rₛₒᵢₗ) in summer and autumn of 2009 in combination with microbial biomass and nutrient availability during autumn freeze‐i ...
DOI:
10.1111/j.1365-2486.2012.02770.x

3. No stimulation of nitrogen fixation by non‐filamentous diazotrophs under elevated CO2 in the South Pacific

Author:
Law, Cliff S.; Breitbarth, Eike; Hoffmann, Linn J.; McGraw, Christina M.; Langlois, Rebecca J.; LaRoche, Julie; Marriner, Andrew; Safi, Karl A.
Source:
Global change biology 2012 v.18 no.10 pp. 3004-3014
ISSN:
1354-1013
Subject:
Trichodesmium; ambient temperature; carbon dioxide; carbon dioxide enrichment; carbon dioxide fixation; greenhouses; microscopy; nitrogen; nitrogen fixation; nitrogen-fixing bacteria; nitrogen-fixing cyanobacteria; pH; plankton; quantitative polymerase chain reaction; surface water; trace elements
Abstract:
... Nitrogen fixation by diazotrophic cyanobacteria is a critical source of new nitrogen to the oligotrophic surface ocean. Research to date indicates that some diazotroph groups may increase nitrogen fixation under elevated pCO₂. To test this in natural plankton communities, four manipulation experiments were carried out during two voyages in the South Pacific (30–35ᵒS). High CO₂ treatments, produced ...
DOI:
10.1111/j.1365-2486.2012.02777.x

4. Recovery of ponderosa pine ecosystem carbon and water fluxes from thinning and stand‐replacing fire

Author:
Dore, Sabina; Montes‐Helu, Mario; Hart, Stephen C.; Hungate, Bruce A.; Koch, George W.; Moon, John B.; Finkral, Alex J.; Kolb, Thomas E.
Source:
Global change biology 2012 v.18 no.10 pp. 3171-3185
ISSN:
1354-1013
Subject:
Pinus ponderosa; burning; carbon; carbon cycle; carbon dioxide; carbon sinks; drought; dry environmental conditions; ecosystems; eddy covariance; evapotranspiration; forests; global warming; grasslands; photosynthesis; primary productivity; temperature; wildfires; Arizona
Abstract:
... Carbon uptake by forests is a major sink in the global carbon cycle, helping buffer the rising concentration of CO₂ in the atmosphere, yet the potential for future carbon uptake by forests is uncertain. Climate warming and drought can reduce forest carbon uptake by reducing photosynthesis, increasing respiration, and by increasing the frequency and intensity of wildfires, leading to large releases ...
DOI:
10.1111/j.1365-2486.2012.02775.x

5. Sea anemones may thrive in a high CO2 world

Author:
Suggett, David J.; Hall‐Spencer, Jason M.; Rodolfo‐Metalpa, Riccardo; Boatman, Toby G.; Payton, Ross; Tye Pettay, D.; Johnson, Vivienne R.; Warner, Mark E.; Lawson, Tracy
Source:
Global change biology 2012 v.18 no.10 pp. 3015-3025
ISSN:
1354-1013
Subject:
Anthozoa; Symbiodinium; anthropogenic activities; calcification; carbon dioxide; corals; marine ecosystems; microalgae; ocean acidification; oceans; photosynthesis; seawater; Italy
Abstract:
... Increased seawater pCO₂, and in turn ‘ocean acidification’ (OA), is predicted to profoundly impact marine ecosystem diversity and function this century. Much research has already focussed on calcifying reef‐forming corals (Class: Anthozoa) that appear particularly susceptible to OA via reduced net calcification. However, here we show that OA‐like conditions can simultaneously enhance the ecologica ...
DOI:
10.1111/j.1365-2486.2012.02767.x

6. Temperature adaptation of bacterial communities in experimentally warmed forest soils

Author:
Rousk, Johannes; Frey, Serita D.; Bååth, Erland
Source:
Global change biology 2012 v.18 no.10 pp. 3252-3258
ISSN:
1354-1013
Subject:
bacterial communities; carbon dioxide; field experimentation; forest soils; microbial growth; soil temperature; temperate forests
Abstract:
... A detailed understanding of the influence of temperature on soil microbial activity is critical to predict future atmospheric CO₂ concentrations and feedbacks to anthropogenic warming. We investigated soils exposed to 3–4 years of continuous 5 °C‐warming in a field experiment in a temperate forest. We found that an index for the temperature adaptation of the microbial community, Tₘᵢₙ for bacterial ...
DOI:
10.1111/j.1365-2486.2012.02764.x