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The dependence of respiration on photosynthetic substrate supply and temperature: integrating leaf, soil and ecosystem measurementsNARA Subscribed
Interactions between photosynthetic substrate supply and temperature in determining the rate of three respiration components (leaf, belowground and ecosystem respiration) were investigated within three environmentally controlled, Populus deltoides forest bays at Biosphere 2, Arizona. Over 2 months, the atmospheric CO 2 concentration and air temperature were manipulated to test the following hypotheses: (1) the responses of the...
The effect of elevated atmospheric CO 2 and drought on sources and sinks of isoprene in a temperate and tropical rainforest mesocosmNARA Subscribed
Isoprene is the most abundant volatile hydrocarbon emitted by many tree species and has a major impact on tropospheric chemistry, leading to formation of pollutants and enhancing the lifetime of methane, a powerful greenhouse gas. Reliable estimates of global isoprene emission from different ecosystems demand a clear understanding of the processes of both production and consumption. Although the biochemistry of isoprene produc...
We took advantage of the distinctive system‐level measurement capabilities of the Biosphere 2 Laboratory (B2L) to examine the effects of prolonged exposure to elevated [CO 2 ] on carbon flux dynamics, above‐ and belowground biomass changes, and soil carbon and nutrient capital in plantation forest stands over 4 years. Annually coppiced stands of eastern cottonwoods ( Populus deltoides ) were grown under ambient (400 ppm) and t...
The effect of elevated CO 2 on diel leaf growth cycle, leaf carbohydrate content and canopy growth performance of Populus deltoidesNARA Subscribed
Image sequence processing methods were applied to study the effect of elevated CO 2 on the diel leaf growth cycle for the first time in a dicot plant. Growing leaves of Populus deltoides , in stands maintained under ambient and elevated CO 2 for up to 4 years, showed a high degree of heterogeneity and pronounced diel variations of their relative growth rate (RGR) with maxima at dusk. At the beginning of the season, leaf growth...
Increased leaf area dominates carbon flux response to elevated CO 2 in stands of Populus deltoides (Bartr.)NARA Subscribed
We examined the effects of atmospheric vapor pressure deficit (VPD) and soil moisture stress (SMS) on leaf‐ and stand‐level CO 2 exchange in model 3‐year‐old coppiced cottonwood ( Populus deltoides Bartr.) plantations using the large‐scale, controlled environments of the Biosphere 2 Laboratory. A short‐term experiment was imposed on top of continuing, long‐term CO 2 treatments (43 and 120 Pa), at the end of the growing season....
Leaf respiration is differentially affected by leaf vs. stand‐level night‐time warmingNARA Subscribed
Plant respiration is an important physiological process in the global carbon cycle serving as a major carbon flux from the biosphere to the atmosphere. Respiration is sensitive to temperature providing a link between environmental variability, climate change and the global carbon cycle. We measured leaf respiration in Populus deltoides after manipulating the air temperature surrounding part of a single leaf, and compared this...
Contributory presentations/postersNARA Subscribed
Estimating Foliage Area of Loblolly Pine ShootsNARA Subscribed
In this study, foliage surface area of loblolly pine (Pinus taeda L.) shoots from plants grown in a 2 x 2 factorial study of nutrients and water and three levels of CO2 was predicted by flush (growth cycle). Harms (1971) predicted foliage surface area of a flush from the weighted product of foliated flush length and average needle length. In the present study flush foliage surface area was predicted using the product of the na...
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