Groundwater can serve as an important resource for woody vegetation in semiarid landscapes, particularly when soil water is functionally depleted and unavailable to plants. This study examines the uptake of groundwater by deciduous blue oak trees (Quercus douglasii) in a California oak savanna. Here we present a suite of …
Journal: Water Resources Research, Volume 46 (10): n/a-n/a (2010), ISBN . DOI: 10.1029/2009wr008902 Sites: US-Ton
We investigated soil carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) exchanges in an age-sequence (4, 17, 32, 67 years old) of …
Journal: Global Change Biology, Volume 16 (8): 2198-2212 (2010), ISBN . DOI: 10.1111/j.1365-2486.2009.02066.x Sites: CA-TP1, CA-TP2, CA-TP3, CA-TP4
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
Agricultural crops with a C4 photosynthetic pathway rapidly expanded across North America as early as 800 A.D. Their distribution continues to expand globally as demands for food and biofuel production …
Journal: Global Biogeochemical Cycles, Volume 24 (4): n/a-n/a (2010), ISBN . DOI: 10.1029/2009GB003768 Sites: US-Ro1, US-Ro2, US-Ro3, US-Ro4
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
The oxygen isotope composition of evapotranspiration (δF) represents an important tracer in the study of biosphere–atmosphere interactions, hydrology, paleoclimate, and carbon cycling. Here, we demonstrate direct measurement of Journal: Boundary-Layer Meteorology, Volume 137 (2): 307-326 (2010), ISBN . DOI: 10.1007/s10546-010-9529-5
Sites: US-Ro1The climate sensitivity of plant seasonal life cycles, or phenology, may impart significant carbon cycle feedbacks on climatic change. Analysis of interannual ecosystem carbon exchange provides one way to assess this climate sensitivity. Multiyear eddy covariance carbon dioxide flux observations from five different ecosystems (deciduous …
Journal: Journal Of Geophysical Research, Volume 115 (G00J02): n/a-n/a (2010), ISBN . DOI: 10.1029/2010JG001423 Sites: US-Los, US-PFa, US-Syv, US-WCr
We present four years (2005–2008) of biometric (B) and eddy-covariance (EC) measurements of carbon (C) fluxes to constrain estimates of gross primary production (GPP), net primary production (NPP), ecosystem respiration (RE) and net ecosystem production (NEP) in an age-sequence (6-, 19-, 34-, and 69-years-old in 2008) of pine forests …
Journal: Agricultural And Forest Meteorology, Volume 150 (7-8): 952-965 (2010), ISBN . DOI: 10.1016/j.agrformet.2010.03.002 Sites: CA-TP1, CA-TP2, CA-TP3, CA-TP4
The intensification of the hydrological cycle, with an observed and modeled increase in drought incidence and severity, underscores the need to quantify drought effects on …
Journal: Global Change Biology, Volume 16 (2): 657-670 (2010), ISBN . DOI: 10.1111/j.1365-2486.2009.01991.x Sites: BR-Ma2
It is well known that microbial-mediated soil respiration, the major source of CO2 from terrestrial ecosystems, is sensitive to temperature. Here, we hypothesize that some mechanisms, such as acclimation of microbial respiration to temperature and/or regulation by plant fresh C inputs of the temperature sensitivity of …
Journal: Biogeochemistry, Volume 98 (1-3): 127-138 (2010), ISBN . DOI: 10.1007/s10533-009-9381-1 Sites: US-Ton