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Showing 1 to 20 of 32 for “"Sap Flow"”.
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Estimating Evapotranspiration of a Riparian Forest Using Sap Flow Measurements
… forest, which were based on measurements of sap flow in phreatophytic vegetation within a riparian corridor. The riparian corridor was within a study area 75 to 140 meters wide in the lower portion of the Scotts Creek watershed, which is bounded to the west by the Pacific Ocean in Santa Cruz …
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Assessing evapotranspiration rates of a Mid-Atlantic red maple riparian wetland using sap flow sensors.
… daily than interior trees, b) correlations among sap flow rates and energy balance-derived estimates, c) variations in ecosystem ET estimates based on 6 scaling variables, and d) diurnal correlations between maximum sap flow rates and streamflow losses. Results from this study indicate that: a) …
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Estimating and Modeling Transpiration of a Mountain Meadow Encroached by Conifers Using Sap Flow Measurements
… encroached conifers in a mountain meadow using sap flow prior to restoration by tree removal. We report results of lodgepole pine transpiration estimates for an approximate 1-year period and an evaluation of key environmental variables influencing water use during a dry growing season.</p> …
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Water turnover in species-rich and species-poor deciduous forests: xylem sap flow and canopy transpiration
Die Bedeutung der Pflanzenvielfalt für Ökosystemfunktionen ist ein zentraler Forschungsschwerpunkt in der Ökologie in den letzten 15 Jahren. Viele Untersuchungen fokussieren sich auf die Bedeutung der Artenvielfalt für Pflanzenbiomasse und produktivität im Grünland; viel weniger ist bekannt wie die …
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Dynamic interactions between CO2 efflu, sap flow and internal CO2 concentration in tree stems: implications towards the assessment of actual stem respiration
… measurements of internal CO2 concentration and sap flow are indispensable for quantifying the stem respiration. Another part of respired CO2 can be re-fixed by stem photosynthesis under light. In order to quantify the actual stem respiration, stem photosynthesis needs to be avoided by shielding …
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Branch junction constriction and hydraulic limitation in two species in the Cape Proteaceae : a mechanism explaining the trade-off between longevity and degree of ramification in the Cape Proteaceae
… nodes are regions of greater resistance to xylem sap flow in the study species; attempting to quantify nodal resistance for a plant as a whole; and by determining if there is any evidence for hydraulic limitation or compensation in Leucadendron laureolum (Lam.) Fourc. and Leucospermum oleifolium …
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Susceptibility Of Headwater Catchment Hydrology To Persistent Droughts And Forest Structure Modification - A Plot To Catchment Scale Analysis
… such as thinning alter the soil moisture and sap flow dynamics during a severe drought. The reduced forest density across the thinned forest prolonged the initiation of the soil moisture recession, resulting in more available water later in the growing season. Furthermore, across the study …
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The climatic significance of tropical forest edges and their representation in global climate models
… global forest-atmosphere water exchange. Mean sap flow in trees within 50 meters of a forest-clearing boundary was found to be 73% greater than that in trees further into the forest; an observation supported by the decreased canopy temperature also recorded there. Evaporation from the forest …
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Water-use efficiency, photosynthetic characteristics, and high through-put phenotyping methods for soybean (glycine max) genotypes contrasting in carbon isotope discrimination
… images to estimate canopy temperature and sap flow sensors to estimate field water use provided excellent insight into differences among watering treatments and genotypes for transpiration rates. This research demonstrates, that in soybean, CID can be used as a screening tool to select for …
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Effects of Soil Amendments and Biostimulants on the Post-transplant Growth of Landscape Trees
… humate+) on the post-transplant root growth and sap-flow of landscape-sized balled and burlapped Acer rubrum L. (red maple) grown in root observation compartments (rhizotrons). Biostimulants did not increase root growth over control treatments, but sap-flow was increased. The third experiment, …
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Micrometeorological approaches to measure and model surface energy fluxes of irrigated citrus orchards in a semi-arid environment
… situ measurements of transpiration by up-scaled sap flow techniques, physiological plant features and microclimatic characteristics of the study area. Derived actual crop evapotranspiration fluxes, by means of the resolution of the energy balance equation opportunely corrected for closure, and …
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A transient heat probe sensor for measuring transpiration in the stem of woody plants.
… system has been developed for measurement of sap flow through the xylem in the stem of woody plants. This system utilizes a single heated thermistor probe which is alternately and automatically switched between a constant (heating phase) and a variable (cooling phase) temperature mode of …
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Analysis of the "nurse-tree effect" of exotic shelter trees on the growth of the indigenous Podocarpus falcatus in an Ethiopian montane forest
Ethiopian forests disappear with a rate of 1.1% per year due to the high demand of firewood and timber. To protect the remaining parts of the forests, exotic tree plantations were established 60 years ago. But there are considerable concerns regarding exotic plantations: they have the reputation to …
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'Hass' avocado tree water use and the effects of water stress on fruit development
… 2019. Avocado tree water use was quantified by sap flow measurement and the soil water balance method at three sites in the main avocado growing regions of the Bay of Plenty, Whangarei, and the Far North, New Zealand, with consideration of local differences in climate and soil type, and …
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Canopy transpiration of beech forests in Northern Bavaria – Structure and function in pure and mixed stands with oak at colline and montane sites
… and stand level) as estimated from xylem sap flow measurements, in two mixed stands in the colline-submontane Steigerwald, a pure beech plot in the Steigerwald and a montane pure beech stand in the Fichtelgebirge in Northern Bavaria. Both the short-term control on transpiration via …
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Il ruolo della vegetazione sui processi idrologici di ecosistemi Mediterranei in condizioni idriche limitanti
… has been studied through the coupled use of sap flow sensor observations and eddy covariance measurements. Results show the key role of sap flow technique for the estimate of ET in such dry conditions, typical of Mediterranean ecosystems. In the next step the contrasting influences of …
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Ecohydrology of a seasonal cloud forest in Dhofar
… the rainfall measured above the canopy. Stemflow contributes about one third of the total water received by the soil. Soil moisture observations are consistent with increased infiltration in proximity of the tree trunks. Sap flow and meteorological observations indicate that transpiration is …
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Analyzing Evapotranspiration in the Tropical Montane Cloud Forest at Sierra de Bahoruco, Dominican Republic
… two sites in Sierra de Bahoruco using Granier’s sap flow sensors, dendrometers, and thermistors, along with co-located weather stations. The lowest site, Zapotén (1537 masl), is part of the tropical montane cloud forest and consists of a mix of pines and broadleaf trees. The highest elevation, …
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Water Use of Landscape Trees During Pot-In-Pot Production and During Establishment in the Landscape
… was affected by frequent irrigation. A study of sap flow pattern indicated that late day water stress of red maples was partially alleviated by frequent irrigation. In the second experiment, red and sugar maples were transplanted to field soil after one (1-yr) or two (2-yr) years of P+P …
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