Standardized reference evapotranspiration (ET) and ecosystem-specific vegetation coefficients are frequently used to estimate actual ET. However, equations for calculating reference ET have not been well validated in tropical environments. We measured ET (ETEC) using eddy covariance (EC) towers at two irrigated sugarcane …
Journal: Hydrology And Earth System Sciences, Volume 19 (1): 583-599 (2015). DOI: 10.5194/hess-19-583-2015 Sites: US-SuS, US-SuW
Temperate forests play an important role in the global
carbon cycle, and are thought to currently be a sink for
atmospheric CO2. However,we lack understanding of
the drivers of forest carbon accumulation and loss,
hampering our ability to predict carbon cycle
responses to global change. In this study,we used CO2
flux and radiocarbon …
Journal: Ecosystems, Volume 18: 459-470 (2015). DOI: Sites: US-Wrc
It is necessary to partition eddy covariance measurements of carbon dioxide exchange into its offsetting gross fluxes, canopy photosynthesis, and ecosystem respiration, to understand the biophysical controls on the net fluxes. And independent estimates of canopy photosynthesis (G) and ecosystem respiration (R) are needed to validate …
Journal: Agricultural and Forest Meteorology, Volume 207: 117-126 (2015). DOI: 10.1016/j.agrformet.2015.03.010 Sites: CA-Ca1, CA-Ca2, CA-Ca3, CA-Let, CA-Mer, CA-NS1, CA-NS3, CA-NS5, CA-NS6, CA-NS7, CA-Oas, CA-Obs, CA-Ojp, CA-Qcu, CA-Qfo, CA-SJ2, CA-SJ3, CA-TP4, CA-WP1, US-ARM, US-Aud, US-Bo1, US-Ho1, US-Ho2, US-IB2, US-KS2, US-MMS, US-MOz, US-NC2, US-NR1, US-SO2, US-SO3, US-SO4, US-SP2, US-SP3, US-SRM, US-Ton, US-Tw3, US-UMB, US-Var, US-WBW, US-Wkg, US-Wrc
Journal: Journal of Geophysical Research: Biogeosciences, Volume 121: 188-204 (2015). DOI: 10.1002/2015jg003054 Sites: US-Myb
Journal: Agricultural And Forest Meteorology, Volume 214-215: 80-90 (2015). DOI: 10.1016/j.agrformet.2015.08.247 Sites: US-Prr
Net ecosystem exchange of carbon was measured using eddy covariance for four growing seasons at a subarctic hummocky fen in northern Manitoba, Canada. Over a 115 day measurement period each year, cumulative net ecosystem exchange of carbon ranged from a gain of 49 g C m−2 to a loss of 16 g C m−2 with a mean loss of 6 g C m−2 …
Journal: Arctic Science, Volume 1 (2): 27-44 (2015). DOI: 10.1139/as-2015-0003 Sites: CA-CF1, CA-CF2
Journal: PNAS, Volume 112: 9839-9843 (2015). DOI: doi: 10.1073/pnas.1503598112 Sites: US-KCM
An open black spruce forest, the most common ecosystem in interior Alaska, is characterized by patchy canopy gaps where the forest understory is exposed. This study measured CO2, sensible heat, and latent heat fluxes with eddy covariance (EC) in one of those large canopy gaps, and estimated understory fluxes in a black spruce forest …
Journal: Agricultural And Forest Meteorology, Volume 214-215: 80-90 (2015). DOI: 10.1016/j.agrformet.2015.08.247 Sites: US-Prr
The 14CO2 composition of plant and soil respiration can be used to determine the residence time of photosynthetically fixed carbon before it is released back to the atmosphere. To estimate the residence time of actively cycled carbon in a temperate forest, we employed two approaches for estimating the Δ14CO2 of ecosystem respiration …
Journal: Journal Of Geophysical Research: Biogeosciences, Volume 120 (4): 600-616 (2015). DOI: 10.1002/2014jg002808 Sites: US-WCr
Journal: Biogeosciences, Volume 12 (23): 7349-7377 (2015). DOI: 10.5194/bg-12-7349-2015 Sites: US-NR1