Results 221 to 230 of about 23,578 (252)

Measurement of bleeding sap flow velocity in xylem bundle of herbs by laser probing

SPIE Proceedings, 1991
A method for measuring the bleeding sap flow velocity (BSFV) in xylem bundle of herbs by means of He-Ne laser probing is developed. The method is applied to the study of the BSFV dependence in conductive bundles on the illumination of the herb and on the value of bioelectric potentials (BEP) between the base and the top of the herb.
Yuri A. Romanovsky, A. S. Stepanian, Yury H. Shogenov   +2 more
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An Improved Thermoelectric Probe for Measurements of Apparent Sap Flow Velocity in Intact Plant Stems

Journal of Experimental Botany, 1985
Gray, H. R., Erickson, P. I. and Stone, J. F. 1985. An improved thermoelectric probe for measurement of apparent sap flow velocity in intact plant stems.—J. exp. Bot. 36: 1320-1324. An improved thermoelectric technique for non-intrusive, non-destructive, and direct sensing of the apparent velocity of sap flow in intact plant stems is presented.
H. R. GRAY, P. I. ERICKSON, J. F. STONE
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Instantaneous sap flow velocity simulation of Euonymus bungeanus based on neural network optimization model.

Ying yong sheng tai xue bao = The journal of applied ecology, 2023
The sap flow of trees is complex and difficult to express with multivariate linear or empirical models. A simple and feasible method on the basis of understanding sap flow variation to simulate its variation with environmental factors is of special importance for quantitatively analyzing forest ecohydrological processes and regional water demand.
Peng, Zhou, Lei, Han, Ling, Peng, Li-Li, Liu, Na-Na, Wang, Jun, Ma, Yun-Lei, Ma   +6 more
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Spatial variation in sap flow velocity in semiarid region trees: its impact on stand‐scale transpiration estimates

Hydrological Processes, 2011
AbstractIn this study, we aimed to clarify spatial variations in xylem sap flow, and to determine the impacts of these variations on stand‐scale transpiration (E) estimates. We examined circumferential and radial variations in sap flow velocity (Fd) measured at several directions and depths in tree trunks of black locust (Robinia pseudoacacia) and ...
Tomonori Kume, Kyoichi Otsuki, Sheng Du, Norikazu Yamanaka, Yi‐Long Wang, Guo‐Bin Liu   +5 more
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Sap-flow velocities and distribution of wet-wood in trunks of healthy and unhealthy Quercus robur, Quercus petraea and Quercus cerris oak trees in Hungary

Chemosphere, 1998
Abstract Sap-flow of Quercus robur, Quercus petraea and Quercus cerris oak trees were studied. 43 K radioisotope tracing, the heat pulse velocity technique and the Granier-method were employed. Numerous intense pulses were observed in healthy Quercus petraea superposing onto the usual diurnal change.
Fenyvesi A, Béres C, Raschi A, TOGNETTI, Roberto, Ridder H. W, Molnár T, Röfler J, Lakatos T, Csiha I.   +8 more
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A thermal pulse method for the determination of sap flow velocity using a single probe: Conceptual evaluation

Journal of Agricultural Engineering Research, 1989
A new concept of a heat pulse technique for the measurement of sap flow in plants is presented. It is based on using a single sensor, rather than the multiprobe arrangements, as used up to now. The single probe serves both as a heat source, and subsequently, as a sensor of the temperature transient decay.
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The verification of the heat pulse velocity technique for estimating sap flow in Eucalyptusgrandis

Canadian Journal of Forest Research, 1991
The heat pulse velocity technique was verified on a diffuse porous hardwood, Eucalyptusgrandis Hill ex. Maiden, using the cut-tree method. The heat pulse velocity apparatus accurately reflected sap flow in the stems of 3-year-old trees and of a 16-year-old tree.
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Limitations of a compensation heat pulse velocity system at low sap flow: implications for measurements at night and in shaded trees

Tree Physiology, 1998
Unlike an ideal system, the return time to thermal balance (t(b)) between upstream and downstream thermistors, as measured by the (compensation) heat pulse velocity method, effectively depends on the heat input and the water content of the wood at zero and low sap flow.
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[Time lag effect between poplar' s sap flow velocity and microclimate factors in agroforestry system in West Liaoning Province].

Ying yong sheng tai xue bao = The journal of applied ecology, 2012
By using Granier's thermal dissipation probe, the sap flow velocity of the poplars in agroforestry system in west Liaoning was continuously measured, and the microclimate factors were measured synchronously. Dislocation contrast method was applied to analyze the sap flow velocity and corresponding air temperature, air humidity, net radiation, and vapor
Sun, Di, De-xin, Guan, Feng-hui, Yuan, An-zhi, Wang, Jia-bing, Wu   +4 more
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LIMITATIONS IN THE HYDRAULIC PATHWAY: EFFECTS OF XYLEM EMBOLISMS ON SAP VELOCITY AND FLOW

Acta Horticulturae, 2013
H.J. Schenk, S. Espino, A.N. Mendez, A.J. McElrone   +3 more
openaire   +1 more source