Results 291 to 300 of about 324,903 (339)

Biotic, Abiotic, and Management Controls on the Net Ecosystem CO2 Exchange of European Mountain Grassland Ecosystems

Ecosystems, 2008
The net ecosystem carbon dioxide (CO2) exchange (NEE) of nine European mountain grassland ecosystems was measured during 2002-2004 using the eddy covariance method. Overall, the availability of photosynthetically active radiation (PPFD) was the single most important abiotic influence factor for NEE.
Wohlfahrt, G., Anderson Dunn, M., Bahn, M., Balzarolo, M., Berninger, F., Campbell, C., Carrara, A., Cescatti, A., Christensen, T., Dore, S., Eugster, W., Friborg, T., Furger, M., Gianelle, Damiano, Gimeno, C., Hargreaves, K., Hari, P., Haslwanter, A., Johannson, T., Marcolla, Barbara, Milford, C., Nagy, Z., Nemitz, E., Rogiers, N., Sanz, M. J., Siegwolf, R., Susiluoto, S., Sutton, M., Tuba, Z., Ugolini, F., Valentini, R., Zorer, Roberto, Cernusca, A.   +32 more
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Northern Canadian Wetlands: Net Ecosystem CO2 Exchange and Climatic Change

Climatic Change, 1998
Northern Canadian peatlands represent a long term sink for atmospheric carbon dioxide (CO2), however there is concern they may become a net source of CO2 due to climatic change. Climatic change is expected to result in significant changes in regional hydrology in boreal and subarctic regions of Canada.
J.M. Waddington, T.J. Griffis, W.R. Rouse   +2 more
openaire   +1 more source

Net CO 2 exchange of a subarctic mountain birch ecosystem

Theoretical and Applied Climatology, 2001
Net ecosystem CO2 exchange was measured over a mountain birch forest in northern Finland throughout the growing season. The maximal net CO2 uptake rate of about − 0.5 mg(CO2) m−2 s−1 was observed at the end of July. The highest nocturnal respiration rates in early August were 0.2 mg(CO2) m−2 s−1.
M. Aurela, J.-P. Tuovinen, T. Laurila
openaire   +1 more source

Net Ecosystem Exchange of CO2 in Permafrost Larch Ecosystems

2009
Carbon dioxide exchange between the ecosystem and the atmosphere would be a major component for carbon budget at boreal forests. In this chapter, net ecosystem exchange (NEE) of CO2 at a permafrost larch ecosystem will be discussed, based on a micrometeorological (tower flux) measurement.
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Annual net ecosystem carbon exchange by a sugar beet crop

Agricultural and Forest Meteorology, 2006
Eddy covariance measurements of CO2 fluxes were conducted in 2004 at the agricultural site of Lonzee, Belgium, over a sugar beet crop. Additional measurements of biomass net primary production and leaf area index (LAI) were carried out. The response of the fluxes to climatic and non-climatic variables was analysed.
Moureaux, Christine, Debacq, Alain, Bodson, Bernard, Heinesch, Bernard, Aubinet, Marc   +4 more
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Environmental Controls over Net Exchanges of Carbon Dioxide from Contrasting Florida Ecosystems

Ecological Applications, 1999
Net CO2 exchange estimated using eddy covariance and relaxed eddy accumulation indicated that evergreen pine upland and deciduous cypress wetland ecosystems in north-central Florida had similar apparent light compensation points during the growing season (125 vs.
Kenneth L. Clark, Henry L. Gholz, John B. Moncrieff, Ford Cropley, Henry W. Loescher   +4 more
openaire   +1 more source

Carbon Sequestration from Remotely-Sensed NDVI and Net Ecosystem Exchange

2002
Aircraft eddy flux measurements of net ecosystem exchange were acquired in 1999 over four southeastern Wyoming landscapes: a coniferous forest, a mixed dryland/irrigated agricultural area, a mixed-grass prairie, and a sagebrush steppe. A linear relationship between net ecosystem exchange and the absorbed photosynthetically active radiation was used to ...
E. Raymond Hunt, J. T. Fahnestock, Robert D. Kelly, Jeffrey M. Welker, William A. Reiners, William K. Smith   +5 more
openaire   +1 more source

Responses of net ecosystem CO2 exchange to nitrogen fertilization in experimentally manipulated grassland ecosystems

Agricultural and Forest Meteorology, 2009
Nitrogen (N) addition enhances primary productivity of terrestrial ecosystems. However, the effects of N fertilization and/or deposition on net ecosystem CO2 exchange (NEE) are not fully understood. The effects of N on NEE were investigated in two experimental cheatgrass ecosystems in Ecologically Controlled Enclosed Lysimeter Laboratories (EcoCELLs ...
Xiaoli Cheng, Yiqi Luo, Bo Su, Paul S.J. Verburg, Dafeng Hui, Daniel Obrist, John A. Arnone, Dale W. Johnson, R. David Evans   +8 more
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Using continuous stable isotope measurements to partition net ecosystem CO₂ exchange

Plant, Cell & Environment, 2005
ABSTRACTEcosystem‐scale estimation of photosynthesis and respiration using micrometeorological techniques remains an important, yet difficult, challenge. In this study, we combined micrometeorological and stable isotope methods to partition net ecosystem CO2 exchange (FN) into photosynthesis (FA) and respiration (FR) in a corn–soybean rotation ...
Jianmin, Zhang, Timothy J, Griffis, John M, Baker   +2 more
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Net ecosystem CO2 exchange over a larch forest in Hokkaido, Japan

Atmospheric Environment, 2004
Abstract Larch forests are distributed extensively in the east Eurasian continent and are expected to play a significant role in the terrestrial ecosystem carbon cycling process. In view of the fact that studies on carbon exchange for this important biome have been very limited, we have initiated a long-term flux observation in a larch forest ...
Huimin Wang, Nobuko Saigusa, Susumu Yamamoto, Hiroaki Kondo, Takashi Hirano, Atsushi Toriyama, Yasumi Fujinuma   +6 more
openaire   +1 more source