Publications

Publications Found: 1378

Separation Of Net Ecosystem Exchange Into Assimilation And Respiration Using A Light Response Curve Approach: Critical Issues And Global Evaluation
Lasslop, G., Reichstein, M., Papale, D., Richardson, A. D., Arneth, A., Barr, A., Stoy, P., Wohlfahrt, G.

The measured net ecosystem exchange (NEE) of CO2 between the ecosystem and the atmosphere reflects the balance between gross CO2 assimilation [gross primary production (GPP)] and ecosystem respiration (Reco). For understanding the mechanistic responses of ecosystem processes to environmental change …


Journal: Global Change Biology, Volume 16 (1): 187-208 (2010), ISBN . DOI: 10.1111/j.1365-2486.2009.02041.x Sites: BR-Ma2

Interannual, Seasonal, And Diel Variation In Soil Respiration Relative To Ecosystem Respiration At A Wetland To Upland Slope At Harvard Forest
Phillips, S. C., Varner, R. K., Frolking, S., Munger, J. W., Bubier, J. L., Wofsy, S. C., Crill, P. M.

Soil carbon dioxide efflux (soil respiration, SR) was measured with eight autochambers at two locations along a wetland to upland slope at Harvard Forest over a 4 year period, 2003–2007. SR was consistently higher in the upland plots than at the wetland margin during the late summer/early fall. Seasonal and diel hystereses with …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 115 (G2): n/a-n/a (2010), ISBN . DOI: 10.1029/2008jg000858 Sites: US-Ha1

Age Effects On Carbon Fluxes In Temperate Pine Forests
Peichl, M., Arain, M. A., Brodeur, J. J.

This study evaluates age-related patterns of ecosystem carbon (C) fluxes in a chronosequence (5-, 18-, 33-, and 68-year old in 2007) of planted pine (Pinus strobus L.) forests in southern Ontario, Canada, from 2003 to 2007. Carbon fluxes determined with the eddy covariance technique were normalized by differences in site …


Journal: Agricultural And Forest Meteorology, Volume 150 (7-8): 1090-1101 (2010), ISBN . DOI: 10.1016/j.agrformet.2010.04.008 Sites: CA-TP1, CA-TP2, CA-TP3, CA-TP4

Estimating Annual Carbon Dioxide Eddy Fluxes Using Open-Path Analysers For Cold Forest Sites
Amiro, B.

Annual net ecosystem production (NEP) was estimated at three boreal forest sites where open-path infrared gas analysers were used in eddy covariance systems. The analysers showed apparent ecosystem uptake of carbon dioxide during frozen conditions where small net respiration …


Journal: Agricultural And Forest Meteorology, Volume 150 (10): 1366-1372 (2010), ISBN . DOI: 10.1016/j.agrformet.2010.06.007 Sites: CA-SF1, CA-SF2, CA-SF3

Carbon Dioxide And Methane Fluxes From Arctic Mudboils
Wilson, K. S., Humphreys, E. R.

Climate change is expected to alter the Arctic’s carbon (C) balance and changes in these C-rich ecosystems may contribute to a positive feedback on global climate change. Low-center mudboils, a form of patterned ground in the Arctic, are distinct landforms in which the exchange of greenhouse gases between the atmosphere and soil …


Journal: Canadian Journal Of Soil Science, Volume 90 (3): 441-449 (2010), ISBN . DOI: 10.4141/CJSS09073 Sites: CA-DL2

How To Quantify Tree Leaf Area Index In An Open Savanna Ecosystem: A Multi-Instrument And Multi-Model Approach
Ryu, Y., Sonnentag, O., Nilson, T., Vargas, R., Kobayashi, H., Wenk, R., Baldocchi, D. D.

Savannas are spatially heterogeneous, open ecosystems, thus efforts to quantify canopy structure with methods developed for homogeneous, closed canopies are prone to failure. We examine the applicability of two direct (litterfall, allometry) and five indirect (LAI-2000, …


Journal: Agricultural And Forest Meteorology, Volume 150 (1): 63-76 (2010), ISBN . DOI: 10.1016/j.agrformet.2009.08.007 Sites: US-Ton

Global Convergence In The Temperature Sensitivity Of Respiration At Ecosystem Level
Mahecha, M. D., Reichstein, M., Carvalhais, N., Lasslop, G., Lange, H., Seneviratne, S. I., Vargas, R., Ammann, C., Arain, M. A., Cescatti, A., Janssens, I. A., Migliavacca, M., Montagnani, L., Richardson, A. D.

As climate change accelerates, it is important to know the likely impact of climate change on the carbon cycle (see the Perspective by Reich). Gross primary production (GPP) …


Journal: Science, Volume 329 (5993): 838-840 (2010), ISBN . DOI: 10.1126/science.1189587 Sites: BR-Ma2

Scaling Properties Of Biologically Active Scalar Concentration Fluctuations In The Atmospheric Surface Layer Over A Managed Peatland
Detto, M., Baldocchi, D., Katul, G. G.

The higher-order scalar concentration fluctuation properties are examined in the context of Monin–Obukhov similarity theory for a variety of greenhouse gases that have distinct and separate source/sink locations along an otherwise ideal micrometeorological …


Journal: Boundary-Layer Meteorology, Volume 136 (3): 407-430 (2010), ISBN . DOI: 10.1007/s10546-010-9514-z Sites: US-Snd

Hydrologic Response To Precipitation Pulses Under And Between Shrubs In The Chihuahuan Desert, Arizona
Moran, M. S., Hamerlynck, E. P., Scott, R. L., Stone, J. J., Holifield Collins, C. D., Keefer, T. O., Bryant, R., DeYoung, L., Nearing, G. S., Sugg, Z., Hymer, D. C.

Observations of the temporal and spatial distribution of poststorm soil moisture in open shrublands and savannas are limited, yet they are critical to understanding the interaction and feedback between moisture distribution and canopies. The objective of this analysis was to study the hydrologic impacts of precipitation pulses on …


Journal: Water Resources Research, Volume 46 (W10509): n/a-n/a (2010), ISBN . DOI: 10.1029/2009WR008842 Sites: US-Whs

Relative Contributions Of Soil, Foliar, And Woody Tissue Respiration To Total Ecosystem Respiration In Four Pine Forests Of Different Ages
Khomik, M., Arain, M. A., Brodeur, J. J., Peichl, M., Restrepo-Coupé, N., McLaren, J. D.

Carbon dioxide (CO2) emissions from soil, foliage, and live woody tissue were measured throughout the year in afforested, white pine (Pinus strobus L.) stands (67, 32, 17, and 4 years old as of 2006), growing in a northern temperate climate. The data were used to estimate annual ecosystem respiration (Re) …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 115 (G03024): n/a-n/a (2010), ISBN . DOI: 10.1029/2009JG001089 Sites: CA-TP1, CA-TP3, CA-TP4