scholarly journals Quantifying ecosystem-atmosphere carbon exchange with a 14C label

Eos ◽  
2002 ◽  
Vol 83 (24) ◽  
pp. 265 ◽  
Author(s):  
Susan Trumbore ◽  
Julia B. Gaudinski ◽  
Paul J. Hanson ◽  
John R. Southon
Keyword(s):  
Carbon Exchange

Relationships Between Apparent Nitrogen Fixation and Carbon Exchange Rate in Alfalfa 1

Crop Science ◽  
1980 ◽  
Vol 20 (4) ◽  
pp. 491-495 ◽  
Author(s):  
J. E. Sheehy ◽  
K. A. Fishbeck ◽  
D. A. Phillips
Keyword(s):  
Nitrogen Fixation ◽  
Exchange Rate ◽  
Carbon Exchange

The Long-Term Effect of Ongoing Spruce Decay on Carbon Exchange in Taiga Forests

2020 ◽  
Vol 493 (1) ◽  
pp. 558-561
Author(s):  
D. V. Karelin ◽  
D. G. Zamolodchikov ◽  
A. V. Shilkin ◽  
A. S. Kumanyaev ◽  
S. Yu. Popov ◽  
...  
Keyword(s):  
Term Effect ◽  
Carbon Exchange ◽  
Long Term Effect ◽  
Taiga Forests

Soil moisture, temperature and nitrogen availability interactively regulate carbon exchange in a meadow steppe ecosystem

2021 ◽  
Vol 304-305 ◽  
pp. 108389
Author(s):  
Muqier Hasi ◽  
Xueyao Zhang ◽  
Guoxiang Niu ◽  
Yinliu Wang ◽  
Qianqian Geng ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Nitrogen Availability ◽  
Carbon Exchange ◽  
Meadow Steppe ◽  
Steppe Ecosystem

Adaptation of winter cereal species to shade and competition in a winter/spring cereal forage mixture

1996 ◽  
Vol 76 (2) ◽  
pp. 251-257 ◽  
Author(s):  
V. S. Baron ◽  
E. A. de St Remy ◽  
D. F. Salmon ◽  
A. C. Dick
Keyword(s):  
Winter Wheat ◽  
Dark Respiration ◽  
Dominant Factor ◽  
Carbon Exchange ◽  
Area Index ◽  
Winter Cereal ◽  
Winter Triticale ◽  
Winter Cereals ◽  
Cereal Species ◽  
Shoot Weight

Spring planted mixtures of spring and winter cereals maximize dry matter yield and provide fall pasture by regrowth of the winter cereal. However, delay of initial harvest may reduce the winter cereal component and therefore subsequent regrowth yield. Research was conducted at Lacombe, Alberta to investigate the effect of time of initial cut (stage), winter cereal species (species) and cropping system (monocrop and mixture) on winter cereal shoot weight, leaf carbon exchange efficiency and shoot morphology. These parameters may be related to adaptation of winter cereals to growth and survival in the mixture. Winter cereal plants were grown in pails embedded in monocrop plots of fall rye (Secale cereale L.), winter triticale (X Triticosecale Wittmack) and winter wheat (Triticum aestivum L.) and in binary mixtures with Leduc barley (Hordeum vulgare L.). The plants were removed when the barley reached the boot (B), heads emerged (H), H + 2, H + 4 and H + 6 wk stages. Shoot weight was generally smaller in the mixture than in the monocrop and wheat was reduced more than fall rye and triticale in the mixture compared to the monocrop. Dark respiration rate (r = −0.54) and carbon exchange (r = 0.36) under low light intensity were correlated (P < 0.05) to shoot size in the mixture. Fall rye and winter triticale had lower dark respiration rates than winter wheat. Leaf area index (LAI) was closely correlated (r = 0.83 and 0.84) with shoot weight in both the mixture and monocrop. While species failed to exhibit clear cut differences for LAI, fall rye and winter triticale were reduced less than winter wheat in the mixture relative to the monocrop. Stage was the dominant factor affecting winter cereal growth in both cropping systems, but fall rye and triticale exhibited superior morphological features, and their carbon exchange responses to light were more efficient than wheat, which should allow them to be sustained longer under the shaded conditions of a mixture. Key words: Delayed harvest, shade, spring and winter cereal mixtures, adaptation, carbon exchange, respiration

Ecosystem carbon exchange in response to locust outbreaks in a temperate steppe

Oecologia ◽  
2015 ◽  
Vol 178 (2) ◽  
pp. 579-590 ◽  
Author(s):  
Jian Song ◽  
Dandan Wu ◽  
Pengshuai Shao ◽  
Dafeng Hui ◽  
Shiqiang Wan
Keyword(s):  
Carbon Exchange ◽  
Temperate Steppe ◽  
Ecosystem Carbon ◽  
Ecosystem Carbon Exchange

Photosynthetic Production of Ulva rotundata Bliding Estimated by Oxygen and Inorganic Carbon Exchange Measurements in the Field

2003 ◽  
Vol 46 (4) ◽  
Author(s):  
J. M. Mercado ◽  
A. Avilés ◽  
E. Benítez ◽  
M. Carrasco ◽  
L. Palomo ◽  
...  
Keyword(s):  
Inorganic Carbon ◽  
Carbon Exchange ◽  
Photosynthetic Production

Net ecosystem carbon exchange for Bermuda grass growing in mesocosms as affected by irrigation frequency

Pedosphere ◽  
2022 ◽  
Vol 32 (3) ◽  
pp. 393-401
Author(s):  
Yuan LI ◽  
Gabriel Y.K. MOINET ◽  
Timothy J. CLOUGH ◽  
John E. HUNT ◽  
David WHITEHEAD
Keyword(s):  
Bermuda Grass ◽  
Carbon Exchange ◽  
Irrigation Frequency ◽  
Ecosystem Carbon ◽  
Net Ecosystem Carbon Exchange ◽  
Ecosystem Carbon Exchange

scholarly journals Carbon budget estimation of a subarctic catchment using a dynamic ecosystem model at high spatial resolution

2015 ◽  
Vol 12 (9) ◽  
pp. 2791-2808 ◽  
Author(s):  
J. Tang ◽  
P. A. Miller ◽  
A. Persson ◽  
D. Olefeldt ◽  
P. Pilesjö ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Carbon Budget ◽  
High Spatial Resolution ◽  
Carbon Sink ◽  
Carbon Fluxes ◽  
Ecosystem Model ◽  
Carbon Exchange ◽  
Arctic Ecosystems ◽  
Flux Dynamics ◽  
Ecosystem Responses

Abstract. A large amount of organic carbon is stored in high-latitude soils. A substantial proportion of this carbon stock is vulnerable and may decompose rapidly due to temperature increases that are already greater than the global average. It is therefore crucial to quantify and understand carbon exchange between the atmosphere and subarctic/arctic ecosystems. In this paper, we combine an Arctic-enabled version of the process-based dynamic ecosystem model, LPJ-GUESS (version LPJG-WHyMe-TFM) with comprehensive observations of terrestrial and aquatic carbon fluxes to simulate long-term carbon exchange in a subarctic catchment at 50 m resolution. Integrating the observed carbon fluxes from aquatic systems with the modeled terrestrial carbon fluxes across the whole catchment, we estimate that the area is a carbon sink at present and will become an even stronger carbon sink by 2080, which is mainly a result of a projected densification of birch forest and its encroachment into tundra heath. However, the magnitudes of the modeled sinks are very dependent on future atmospheric CO2 concentrations. Furthermore, comparisons of global warming potentials between two simulations with and without CO2 increase since 1960 reveal that the increased methane emission from the peatland could double the warming effects of the whole catchment by 2080 in the absence of CO2 fertilization of the vegetation. This is the first process-based model study of the temporal evolution of a catchment-level carbon budget at high spatial resolution, including both terrestrial and aquatic carbon. Though this study also highlights some limitations in modeling subarctic ecosystem responses to climate change, such as aquatic system flux dynamics, nutrient limitation, herbivory and other disturbances, and peatland expansion, our study provides one process-based approach to resolve the complexity of carbon cycling in subarctic ecosystems while simultaneously pointing out the key model developments for capturing complex subarctic processes.

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