Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"sap flux"”.
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Evaluating biomass water storage and sap flux in three semi-arid tree species in central Texas
… with respect to juniper tree clearing. We used sap flux observations as a proxy for transpiration and capacitance-style FDR sensors installed directly into trees as a means to assess wood water storage. We also recorded meteorological conditions at the field site including atmospheric vapor …
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Modeling the exchange of energy and matter within and above a spruce forest with the higher-order closure model ACASA
… this purpose, particularly eddy-covariance and sap flux measurements at several heights within the canopy. Thorough model tests were a main focus of this study and led to an improvement of the investigated model. This included both the exploration of the sensitivity and predictive uncertainty of …
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Branch, crown, tree and stand water flux in an 180-year-old loblolly pine plantation after thinning, fertilization, and throughfall exclusion treatments
Branch and tree sap flux density (SFD) was measured to evaluate the effects of thinning, fertilization, and throughfall exclusion treatments on water use by loblolly pine (Pinus taeda L.) trees. Variations in SFD at different radial xylem depths were also examined to improve estimates of tree water …
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Water Use and Water Tolerance in the Riparian Species American Sycamore (Plantanus occidentalis L.) and How its Physiology Compares to the Coexisting Black Willow (Salix nigra Marshall)
… in trees, season-long diurnal measurements of sap flux (using Granier<em> </em>type thermal dissipation probes) were determined <em>in situ</em> for trees growing in a riparian buffer on the Kennesaw State University campus in north west Georgia. For each species, sap flux responses were …
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Assessment of fruit growth response to water stress in a super-high-density olive orchard: monitoring, physiological mechanisms and potential use to schedule irrigation.
… We also estimated leaf stomatal conductance from sap flux measurements, and simulated photosynthesis (Chapter 3). From the simulated photosynthesis, we compared its accumulated values with growth, both vegetative growth (leaf area and number of internodes in current-year stems) and fruit growth …
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Controls on the Spatial-temporal distribution of soil moisture under snow dominated conditions in a naturally vegetated, sub-alpine mountain catchment
… sensors, meteorological station, and sap flux system monitoring an Engelmann Spruce. Results show that the highest heterogeneity in moisture occurs at intermediate water contents resulting from the spring snowmelt driven wetting process while the lowest heterogeneity occurs at the …
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Controls on the Spatial-temporal distribution of soil moisture under snow dominated conditions in a naturally vegetated, sub-alpine mountain catchment
… sensors, meteorological station, and sap flux system monitoring an Engelmann Spruce. Results show that the highest heterogeneity in moisture occurs at intermediate water contents resulting from the spring snowmelt driven wetting process while the lowest heterogeneity occurs at the …
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Longterm Approaches to Assessing Tree Community Responses to Resource Limitation and Climate Variation
… above canopy light, and soil moisture) and stem sap flux data from heat dissipation probes for six co-occurring tree species. I developed a state-space modeling framework for predicting canopy conductance and transpiration which incorporates uncertainty in canopy and observation uncertainty. This …
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Quantifying the Sensitivity of Land-Surface Models to Hydrodynamic Stress Limitations on Transpiration
… also provides the link between latent heat flux and carbon uptake rates. Current land-surface models couple stomata conductance and soil moisture through empirical relationships. This approach does not take advantage of recent advances in our understanding of water flow and storage in trees …
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Water use of forests along elevation gradients in the Berchtesgaden National Park
… and recognition of factors to predict the water fluxes is necessary to estimate the changes in water use according to possible climate change. In this study the processes affecting the transpiration of Norway spruce (Picea abies) in the Berchtesgaden National Park along an elevation gradient were …
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Coupled Behaviour of Soil and Plant Water Dynamics: Effects of Vegetation Cover, Soil Type and Fire Disturbance
… datasets, a water and energy balance model, flux tower data and sap flux data to quantify ecosystem productivity and transpiration rate I show the importance of soil type in controlling the onset, as well as the progression of water limitation. Soil type also influences the relative …
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Coordinated Tree Responses to Drought -Vulnerability and Sustainable Production: Hypotheses on Arid Ecosystem Adjustments to Limitations in Water Resources
… parameters, soil and plant water status, growth, sap flux density, leaf transpiration and stomatal conductance, tissue water relations and isotope labeling. Similar measurements were conducted on plants growing in the greenhouse. Also examined in the greenhouse were root biomass, root structure as …
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Quantifying water use by temperate deciduous forests in South Korea : roles of species diversity, canopy structure, and complex terrain
… canopy transpiration (EC) were estimated from sap flux density measured with thermal dissipation probes. Understory transpiration (EU) was measured using stem heat balance while ecosystem evapotranspiration (Eeco) was determined using eddy covariance technique. Air temperatures (Ta), …