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 20 of 37 for “"Vapor Pressure Deficit"”.
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Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… of the Earth’s climate system. Near-surface vapor pressure deficit, soil temperature, and soil moisture are essential state variables for monitoring high latitude climate and estimating the response of terrestrial ecosystems to climate change. Methods are developed and evaluated to retrieve …
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Satellite Microwave Remote Sensing of Boreal-Arctic Land Surface State and Meteorology from AMSR-E
… of the Earth’s climate system. Near-surface vapor pressure deficit, soil temperature, and soil moisture are essential state variables for monitoring high latitude climate and estimating the response of terrestrial ecosystems to climate change. Methods are developed and evaluated to retrieve …
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Quantifying the Responses of Vegetation to Environmental Stresses
… in deciduous broad-leaf forests, periods of high vapor pressure deficit caused sufficient hydraulic stress to reduce plant productivity more than low soil water content alone, and often reduced productivity to levels equal to periods of both low soil water stress and high vapor pressure deficit. …
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Environmental Influences on Tree-driven Karst Bedrock Physical Weathering
… I determined that temperature’s impact on vapor pressure deficit, which controls the rate of transpiration, was the primary driver of the timing of daily forces. Precipitation led to periods of higher forces, as the roots expanded due to water-uptake as well as reduced tree transpiration …
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Novel water-use strategies of Colorado wetland plants: implications for wetland water loss
… to understand how much water wetlands lose to evaporation and transpiration, and what affects wetland water loss. This paper quantifies the transpiration of five abundant wetland species and investigates physiological mechanisms that drive transpiration rates for each species. The focal species …
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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)
… responses were examined in relation to light and vapor pressure deficit (VPD).</p> <p>In order to assess each species’ response to inundation and drought, CO<sub>2</sub> assimilation and free leaf proline concentration were determined from greenhouse treatments, and separately for individuals …
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THE IMPACT OF MICROCLIMATE ON BRANCH COLONIZATION BY NEOTROPICAL CERAMBYCID BEETLES
… shifters.” They colonized branches at an optimal vapor pressure deficit range from 0–0.78 Pa (representing temperatures ranging from 22.7–24.2 °C, at relative humidities ranging from 91.9–100%). Cerambycid microclimate preferences may help us predict how these ecologically important beetles will …
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Building A Mechanistic Understanding Of Biodiversity And Ecosystem Functioning In Forests
… microclimate (reduced daily amplitude of vapor pressure deficit) within forest canopies, relieving physiological stress of slower-growing trees and contributing to increased complementarity in forest stands. Secondly, I uncovered how forest diversity could facilitate the growth and …
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Genotypic and Environmental Effects on Soybean Canopy Photosynthesis
… it was related to an increase in the ambient air vapor pressure deficit (VPD) causing stomatal closure. Grain sorghum was found to be more sensitive photosynthetically to the VPD increase than cotton or soybean. The results indicate that an increase in VPD was a major factor contributing to the …
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Relative Role of Uncertainty for Predictions of Future Southeastern U.S. Pine Carbon Cycling
… to the change in frost days, temperature, and vapor pressure deficit. Since the uncertainty associated with ecosystem model parameter and process uncertainty was larger than the uncertainty associated with climate predictions, our results indicate that better constraining parameters in …
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Environmental Influences on Gas Exchange in Fertilized and Non-Fertilized Stands of Loblolly Pine
… gas exchange models reveal that light and vapor pressure deficit (VPD) explain a majority of the variation observed in photosynthesis and transpiration, respectively. Conductance was not modeled since environmental variation did not adequately explain conductance patterns. Predicted light …
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Farming in the city: how the urban environment affects vegetable crop production, soil heavy metal contamination and nutrient dynamics, produce nutritive quality, and insect dynamics in urban gardens
… at peri-urban sites. Temperature, CO2, and vapor pressure deficit were higher in urban sites and lowest in the rural site. Yield of spring and fall crops were generally higher in the urban sites and summer planted tomato and bean was higher in peri-urban and rural sites, whereas pepper had …
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Evaluating impacts of hydroclimatic extremes on water use efficiency and carbon use efficiency of northern ecosystems
… vegetation- and moisture-condition-specific. Vapor Pressure Deficit (VPD) consistently emerged as a key negative driver, particularly for forest WUE and CUE. At the same time, Air Temperature (TA), Soil Temperature (TS), and Shortwave Radiation (SW) showed varying importance depending on the …
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Beneficial Fungal Secretome and Synthetic Consortia to Improve Soybean Growth During Drought Stress
… shoot length, stomatal conductance to water vapor (GSW), leaf–air vapor pressure deficit (VPD). Across metrics, responses varied by inoculation and treatment. Sclerostagonospora lathyri appeared to have the most favorable drought performance of the SynCom strains. Chaetosphaeronema sp. …
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Physiological response of loblolly pine seedlings to moisture-stress conditioning and their subsequent performance during water stress
… seedlings. The response of stomata to changing vapor pressure deficit was increased through moisture stress conditioning. Boot growth was affected more by moisture stress than shoot growth, causing a decrease in root/shoot ratio. Changes in root morphology as a result of conditioning are not …
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Longterm Approaches to Assessing Tree Community Responses to Resource Limitation and Climate Variation
… conductance using four years of environmental (vapor pressure deficit, 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 …
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Utilizing High Temporal Resolution Stable Isotope, Sap-Flux, and Eddy Covariance Measurements to Partition Daily Evapotranspiration in an Oak Woodland
… and δt. It was determined that average daytime vapor pressure deficit (VPD) and soil moisture were the best predictors of δe and δt, respectively. These models were significant at the 95% confidence level for both stable isotopes for twigs (δt), but only δ18O for soil (δe). There was a 41 - 49% …
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Non-growing season CO2 fluxes of a boreal fen – key drivers and responses to anomalous winter conditions
… relative importance of air and soil temperature, vapor pressure deficit, water table depth, and photosynthetically active radiation (PAR) on NEE of CO2 was analyzed with a random forest algorithm. PAR and soil temperature were the most important drivers during non growing season, growing season …
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Evaluating biomass water storage and sap flux in three semi-arid tree species in central Texas
… at the field site including atmospheric vapor pressure deficit (VPD), temperature, precipitation, and soil moisture. Our results indicate sap flux can either use internal wood water storage for daily transpiration (an inverse relationship) or be used to recharge the wood water storage (a …
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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
… to photosynthetic photon flux density and vapor pressure deficit. Branch SFD was higher in the upper crown than in the lower crown. Fertilization significantly increased daily branch water use within the thinned plots, but did not significantly affect branch transpiration per unit leaf …
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