AmeriFlux Publications from the Community

Cool-Season Whole-Plant Gas Exchange Of Exotic And Native Semiarid Bunchgrasses
Hamerlynck, E. P., Scott, R. L., Barron-Gafford, G. A., Cavanaugh, M. L., Susan Moran, M., Huxman, T. E.

The success of invasive aridland plants may depend on their utilization of precipitation not fully exploited by native species, which could lead to seasonally altered ecosystem carbon and water fluxes. We measured volumetric soil water across 25-cm profiles (θ_25cm) and springtime whole-plant water- and carbon-fluxes of …

Journal: Plant Ecology, Volume 213 (8): 1229-1239 (2012), ISBN . DOI: 10.1007/s11258-012-0081-x Sites: US-SRM

Impact of Hydrological Variations on Modeling of Peatland CO2 Fluxes: Results From the North American Carbon Program Site Synthesis
Sulman, B. N., Desai, A. R., Schroeder, N. M., Ricciuto, D., Barr, A., Richardson, A. D., Flanagan, L. B., Lafleur, P. M., Tian, H., Chen, G., Grant, R. F., Poulter, B., Verbeeck, H., Ciais, P., Ringeval, B., Baker, I. T., Schaefer, K., Luo, Y., Weng, E.

Northern peatlands are likely to be important in future carbon cycle-climate feedbacks due to their large carbon pools and vulnerability to hydrological change. Use of non-peatland-specific models could lead to bias in modeling studies of peatland-rich regions. Here, seven ecosystem models were used to simulate CO₂fluxes …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 117 (G01031): n/a-n/a (2012), ISBN . DOI: 10.1029/2011JG001862 Sites: US-Los

Increased CO2 Loss From Vegetated Drained Lake Tundra Ecosystems Due To Flooding
Zona, D., Lipson, D. A., Paw U, K. T., Oberbauer, S. F., Olivas, P., Gioli, B., Oechel, W. C.

Tundra ecosystems are especially sensitive to climate change, which is particularly rapid in high northern latitudes resulting in significant alterations in temperature and soil moisture. Numerous studies have demonstrated that soil drying increases the respiration loss from wet Arctic tundra. And, warming and drying of tundra soils …

Journal: Global Biogeochemical Cycles, Volume 26 (GB2004): n/a-n/a (2012), ISBN . DOI: 10.1029/2011GB004037 Sites: US-Bes

Holocene Carbon Stocks And Carbon Accumulation Rates Altered In Soils Undergoing Permafrost Thaw
Pries, C. E. H., Schuur, E. A., Crummer, K. G.

Permafrost soils are a significant global store of carbon (C) with the potential to become a large C source to the atmosphere. Climate change is causing permafrost to thaw, which can affect primary production and decomposition, therefore affecting ecosystem …

Journal: Ecosystems, Volume 15 (1): 162-173 (2012), ISBN . DOI: 10.1007/s10021-011-9500-4 Sites: US-EML

Continuous Measurements Of Net CO2 Exchange By Vegetation And Soils In A Suburban Landscape
Peters, E. B., McFadden, J. P.

In a suburban neighborhood of Minneapolis–Saint Paul, Minnesota, USA, we simultaneously measured net CO₂ exchange of trees using sap flow and leaf gas exchange measurements, net CO₂exchange of a turfgrass lawn using eddy covariance from a portable tower, and total surface-atmosphere CO₂ fluxes (F_C) …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 117 (G03005): n/a-n/a (2012), ISBN . DOI: 10.1029/2011JG001933 Sites: US-KUO

Hurricane Disturbance And Recovery Of Energy Balance, CO2 Fluxes And Canopy Structure In A Mangrove Forest Of The Florida Everglades
Barr, J. G., Engel, V., Smith, T. J., Fuentes, J. D.

Eddy covariance (EC) estimates of carbon dioxide (CO₂) fluxes and energy balance are examined to investigate the functional responses of a mature mangrove forest to a disturbance generated by Hurricane Wilma on October 24, 2005 in the Florida Everglades. At the EC site, high winds from the hurricane caused nearly 100% …

Journal: Agricultural And Forest Meteorology, Volume 153: 54-66 (2012), ISBN . DOI: 10.1016/j.agrformet.2011.07.022 Sites: US-Skr

Influence Of Stand Age On The Magnitude And Seasonality Of Carbon Fluxes In Canadian Forests
Coursolle, C., Margolis, H., Giasson, M., Bernier, P., Amiro, B., Arain, M., Barr, A., Black, T., Goulden, M., McCaughey, J., Chen, J., Dunn, A., Grant, R., Lafleur, P.

Proper management and accounting of forest carbon requires good knowledge of how disturbances and climate affect the carbon dynamics of different stand types. We have investigated such relationships by measuring, over a 5-year period (2003–2007), the net ecosystem productivity (NEP), gross ecosystem productivity …

Journal: Agricultural And Forest Meteorology, Volume 165: 136-148 (2012), ISBN . DOI: 10.1016/j.agrformet.2012.06.011 Sites: CA-TP1, CA-TP2, CA-TP3, CA-TP4

A Comparison Of Three Methods To Estimate Evapotranspiration In Two Contrasting Loblolly Pine Plantations: Age-Related Changes In Water Use And Drought Sensitivity Of Evapotranspiration Components
Domec, J., Sun, G., Noormets, A., Gavazzi, M. J., Treasure, E. A., Cohen, E., Swenson, J. J., McNulty, S. G., King, J. S.

Increasing variability of rainfall patterns requires detailed understanding of the pathways of water loss from ecosystems to optimize carbon uptake and management choices. In the current study we characterized the usability of three alternative methods of different rigor for quantifying stand-level evapotranspiration (ET), partitioned …

Journal: Forest Science, Volume 58 (5): 497-512 (2012), ISBN . DOI: 10.5849/forsci.11-051 Sites: US-NC1, US-NC2

Modeling Energy And Carbon Fluxes In A Heterogeneous Oak Woodland: A Three-Dimensional Approach
Kobayashi, H., Baldocchi, D. D., Ryu, Y., Chen, Q., Ma, S., Osuna, J. L., Ustin, S. L.

Most land surface and ecosystem models assume that a vegetated canopy can be abstracted as a turbid medium when such models compute mass, energy, and carbon exchange. However, those models fail to simulate radiation environments in heterogeneous landscapes. This study aims to couple a spatially explicit three-dimensional (3D) shortwave …

Journal: Agricultural And Forest Meteorology, Volume 152: 83-100 (2012), ISBN . DOI: 10.1016/j.agrformet.2011.09.008 Sites: US-Ton

Modelling Contrasting Responses Of Wetland Productivity To Changes In Water Table Depth
Grant, R.F., Desai, A.R., Sulman, B.N.

Responses of wetland productivity to changes in water table depth (WTD)
are controlled by complex interactions among several soil and plant
processes, and hence are site-specific rather than general in nature.
Hydrological controls on wetland productivity were studied by
representing …

Journal: Biogeosciences, Volume 9 (11): 4215-4231 (2012), ISBN . DOI: 10.5194/bg-9-4215-2012 Sites: US-Los

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