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 16 of 16 for “"vapor pressure deficit (VPD)"”.
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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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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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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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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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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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Water Relations of Ponderosa Pine in Contrasting Environments: Implications for Global Climate Change
… to force a rise in temperature and atmospheric vapor pressure deficit (VPD) by the end of the 21st century. For trees, the most relevant allometric component controlling water transport is the ratio of biomass allocated to leaves versus sapwood (AL/AS). Within Pinus, trees decrease ALAS in …
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Phenology Effects on Carbon and Water Dynamics in a Pristine Boreal Fen A multi-decadal analysis from 2005-2007 & 2014-2022
… 2014-2022). Interactions with temperature (T), vapor pressure deficit (VPD), photosynthetically active radiation (PAR) and rain were included and tested with various statistical methods (trend- and correlation-analysis, commonality analysis, time lag testing, stepwise multiple-regression, and …
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Spatiotemporal Variability of CO2, Solar-Induced Fluorescence, And Precipitation Over the Tropical Rainforests
… fluorescence (SIF), CO2, precipitation, high vapor pressure deficit (VPD), and burned areas). Specifically, we use Orbiting Carbon Observatory 2 (OCO-2) SIF, OCO-2 CO2, Global Precipitation Climatology Project (GPCP) precipitation, Moderate Resolution Imaging Spectrometer (MODIS) burned area, …
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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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How do trees die following low intensity fires: Exploring the hydraulic death hypothesis
… plume-induced cavitation as a result of high vapor pressure deficit (VPD) in a fire-plume has been shown to reduce hydraulic conductance. Secondly, changing surface tension as water is heated has also been shown to increase the chance of cavitation. The final mechanism is a reduction in …
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Optimizing soybean water use and nitrogen fixation to improve productivity under climate change
… and intensity of heat waves and soil moisture deficits, particularly during reproductive development. Additionally, climate change is driving increases in vapor pressure deficit (VPD) in recent decades, suggesting global atmospheric drying. In a U.S. study, VPD during reproductive stages was …
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Water use of forests along elevation gradients in the Berchtesgaden National Park
Forests are major sources of water vapor to the atmosphere and have an important influence on both regional and global climate. Understanding of the water exchange between the vegetation and the atmosphere, and recognition of factors to predict the water fluxes is necessary to estimate the changes …
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Impacts of heat waves on food quantity and quality of soy bean/corn in the Midwest at ambient and elevated [CO2]
… + husk tissue). Heat waves increase atmospheric vapor pressure deficit (VPD), which drives greater evapotranspiration (ET) and leads to plant water loss, decreased A, growth and yield. However, neither of the heat waves in 2011 caused lasting changes to leaf water potential or significantly …
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Quantifying water use by temperate deciduous forests in South Korea : roles of species diversity, canopy structure, and complex terrain
… (Ta), precipitation, solar radiation, vapor pressure deficit (VPD), wind speed were measured from weather stations and soil water content was measured from frequency domain reflectometry (FDR) sensors at the respective study sites. Vegetation surveys, including diameter at breast height …