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Publications Found: 25

The Carbon Balance Pivot Point Of Southwestern U.S. Semiarid Ecosystems: Insights From The 21st Century Drought
Scott, R. L., Biederman, J. A., Hamerlynck, E. P., Barron-Gafford, G. A.

Global-scale studies indicate that semiarid regions strongly regulate the terrestrial carbon sink. However, we lack understanding of how climatic shifts, such as decadal drought, impact carbon sequestration across the wide range of structural diversity in semiarid ecosystems. Therefore, we used eddy covariance measurements to quantify …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 120 (12): 2612-2624 (2015), ISBN . DOI: 10.1002/2015JG003181 Sites: US-SRG, US-Whs, US-Wkg

Does day and night sampling reduce spurious correlation between canopy photosynthesis and ecosystem respiration?
Dennis Baldocchi, Cove Sturtevant

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), ISBN . 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

The carbon balance pivot point of southwestern U.S. semiarid ecosystems: Insights from the 21st century drought
Scott, R.L., Biederman, J.A., Hamerlynck, E.P., Barron-Gafford, G.

Global-scale studies indicate that semiarid regions strongly regulate the terrestrial carbon sink.
However, we lack understanding of how climatic shifts, such as decadal drought, impact carbon sequestration across the wide range of structural diversity in semiarid ecosystems. Therefore, we used eddy covariance measurements to quantify …

Journal: Journal of Geophysical Research: Biogeosciences, Volume 120: 2612-2624 (2015), ISBN . DOI: 10.1002/2015JG003181 Sites: US-SRG, US-SRM, US-Whs, US-Wkg

Consequences Of Cool-Season Drought-Induced Plant Mortality To Chihuahuan Desert Grassland Ecosystem And Soil Respiration Dynamics
P. Hamerlynck, E., L. Scott, R., Barron-Gafford, G. A.

Predicted reductions of cool-season rainfall may expand and accelerate drought-induced plant mortality currently unfolding across the Southwest US. To assess how repeated plant mortality affects ecosystem functional attributes, we quantified net ecosystem CO₂ exchange (NEE), ecosystem respiration (Journal: Ecosystems, Volume 16 (7): 1178-1191 (2013), ISBN . DOI: 10.1007/s10021-013-9675-y Sites: US-Wkg

Energy Exchange And Evapotranspiration Over Two Temperate Semi-Arid Grasslands In North America
Krishnan, P., Meyers, T. P., Scott, R. L., Kennedy, L., Heuer, M.

The seasonal and interannual variability in surface energy exchange and evapotranspiration (E) of two temperate semi-arid grasslands in southeastern Arizona, USA, were investigated using multi-year (2004–2007) eddy covariance measurements. The study sites, a post-fire site (AG) and an unburned site (KG), received 43–87% …

Journal: Agricultural And Forest Meteorology, Volume 153: 31-44 (2012), ISBN . DOI: 10.1016/j.agrformet.2011.09.017 Sites: US-Wkg
Posted: January 30, 2017

The Potential Of Carbonyl Sulfide As A Proxy For Gross Primary Production At Flux Tower Sites
Blonquist, J. M., Montzka, S. A., Munger, J. W., Yakir, D., Desai, A. R., Dragoni, D., Griffis, T. J., Monson, R. K., Scott, R. L., Bowling, D. R.

Seasonal dynamics of atmospheric carbonyl sulfide (OCS) at regional and continental scales and plant OCS exchange at the leaf level have shown a close relationship with those for CO₂. CO₂ has both sinks and sources within terrestrial ecosystems, but the primary terrestrial exchange for OCS is thought to be leaf …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 116 (G4): n/a-n/a (2011), ISBN . DOI: 10.1029/2011jg001723 Sites: US-Wkg
Posted: January 31, 2017

Runoff And Erosional Responses To A Drought-Induced Shift In A Desert Grassland Community Composition
Polyakov, V.O., Nearing, M.A., Stone, J.J., Hamerlynck, E.P., Nichols, M.H., Holifield Collins, C.D., Scott, R.L.

This study investigates how drought-induced change in semiarid grassland community affected runoff and sediment yield in a small watershed in southeast Arizona, USA. Three distinct periods in ecosystem composition and associated runoff and sediment yield were identified according to dominant species: native bunchgrass (1974–2005), …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 115 (G4): n/a-n/a (2010), ISBN . DOI: 10.1029/2010jg001386 Sites: US-Wkg
Posted: January 30, 2017

Carbon Dioxide Exchange In A Semidesert Grassland Through Drought-Induced Vegetation Change
Scott, R.L., Hamerlynck, E.P., Jenerette, G.D., Moran, M.S., Barron-Gafford, G.

Global warming may intensify the hydrological cycle and lead to increased drought severity and duration, which could alter plant community structure and subsequent ecosystem water and carbon dioxide cycling. We report on the net ecosystem exchange of carbon dioxide (NEE) of a semidesert grassland through a severe drought which drove …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 115 (G3): n/a-n/a (2010), ISBN . DOI: 10.1029/2010jg001348 Sites: US-Wkg
Posted: January 30, 2017

Using Watershed Water Balance To Evaluate The Accuracy Of Eddy Covariance Evaporation Measurements For Three Semiarid Ecosystems
Scott, R. L.

The eddy covariance technique is a widely used and accepted method to quantify ecosystem-scale mass and energy fluxes. Eddy covariance measurements of evaporation, also known as evapotranspiration, are used to determine local, regional and global water budgets, calibrate …

Journal: Agricultural And Forest Meteorology, Volume 150 (2): 219-225 (2010), ISBN . DOI: 10.1016/j.agrformet.2009.11.002 Sites: US-SRM, US-Whs, US-Wkg
Posted: January 31, 2017

Partitioning Evapotranspiration In Semiarid Grassland And Shrubland Ecosystems Using Time Series Of Soil Surface Temperature
Moran, M., Scott, R., Keefer, T., Emmerich, W., Hernandez, M., Nearing, G., Paige, G., Cosh, M., O’Neill, P.

Information about the ratio of transpiration (T) to total evapotranspiration (T/ET) is related to critical global change concerns, including shrub encroachment and non-native species invasion. In this study, a new approach was developed to partition measurements …

Journal: Agricultural And Forest Meteorology, Volume 149 (1): 59-72 (2009), ISBN . DOI: 10.1016/j.agrformet.2008.07.004 Sites: US-Whs, US-Wkg
Posted: January 30, 2017

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