Sap flow measurements in grapevines (Vitis vinifera L.). 2. Granier measurements
The Granier-system, a relatively simple and continuous method for measuring sap flux density, has been adapted and evaluated for its use in older, mature grapevines. The original calibration of Granier (1985, Annales Sciences Forestieres, 42, 193-200) could be extended to a sap flux density of up to...
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| Veröffentlicht in: | Plant and soil 1999-01, Vol.215 (1), p.47-55 |
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| creator | Braun, P. (Bonn Univ. (Germany). Inst. fuer Obstbau und Gemuesebau) Schmid, J |
| description | The Granier-system, a relatively simple and continuous method for measuring sap flux density, has been adapted and evaluated for its use in older, mature grapevines. The original calibration of Granier (1985, Annales Sciences Forestieres, 42, 193-200) could be extended to a sap flux density of up to 400 10⁻⁶ m³ m⁻² s⁻¹ with only little error at high flux densities. A time lag of around 20 min was apparent between transpiration and calculated sap flow which was attributed to the thermal mass of the sensors themselves. The time lag and the consequently dampened response of the system caused a very low accuracy over short time periods thus reducing the value for detailed plant physiological investigations. However, when integrating over longer time intervals, much of the error cancelled out. For daily values the maximum error was within ± 10% and after a period of 89 days only 1.5% error remained. This method is thus best suited for long term measurements of total water use. |
| doi_str_mv | 10.1023/A:1004708119821 |
| format | Article |
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The time lag and the consequently dampened response of the system caused a very low accuracy over short time periods thus reducing the value for detailed plant physiological investigations. However, when integrating over longer time intervals, much of the error cancelled out. For daily values the maximum error was within ± 10% and after a period of 89 days only 1.5% error remained. This method is thus best suited for long term measurements of total water use.</description><identifier>ISSN: 0032-079X</identifier><identifier>EISSN: 1573-5036</identifier><identifier>DOI: 10.1023/A:1004708119821</identifier><identifier>CODEN: PLSOA2</identifier><language>eng</language><publisher>Dordrecht: Kluwer Academic Publishers</publisher><subject>Agronomy. Soil science and plant productions ; Biological and medical sciences ; Economic plant physiology ; Flow measurement ; Flow velocity ; Fluctuations ; Flux density ; Fundamental and applied biological sciences. 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(Bonn Univ. (Germany). Inst. fuer Obstbau und Gemuesebau)</creatorcontrib><creatorcontrib>Schmid, J</creatorcontrib><title>Sap flow measurements in grapevines (Vitis vinifera L.). 2. Granier measurements</title><title>Plant and soil</title><description>The Granier-system, a relatively simple and continuous method for measuring sap flux density, has been adapted and evaluated for its use in older, mature grapevines. The original calibration of Granier (1985, Annales Sciences Forestieres, 42, 193-200) could be extended to a sap flux density of up to 400 10⁻⁶ m³ m⁻² s⁻¹ with only little error at high flux densities. A time lag of around 20 min was apparent between transpiration and calculated sap flow which was attributed to the thermal mass of the sensors themselves. The time lag and the consequently dampened response of the system caused a very low accuracy over short time periods thus reducing the value for detailed plant physiological investigations. However, when integrating over longer time intervals, much of the error cancelled out. For daily values the maximum error was within ± 10% and after a period of 89 days only 1.5% error remained. This method is thus best suited for long term measurements of total water use.</description><subject>Agronomy. Soil science and plant productions</subject><subject>Biological and medical sciences</subject><subject>Economic plant physiology</subject><subject>Flow measurement</subject><subject>Flow velocity</subject><subject>Fluctuations</subject><subject>Flux density</subject><subject>Fundamental and applied biological sciences. 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Granier measurements</title><author>Braun, P. (Bonn Univ. (Germany). Inst. fuer Obstbau und Gemuesebau) ; Schmid, J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c299t-dbaf6f61434e203a9aee2ec61b58707377398b7b1231748aa301ba4b41a7d9823</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Agronomy. Soil science and plant productions</topic><topic>Biological and medical sciences</topic><topic>Economic plant physiology</topic><topic>Flow measurement</topic><topic>Flow velocity</topic><topic>Fluctuations</topic><topic>Flux density</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Heat balance</topic><topic>MEASUREMENT</topic><topic>MEDICION</topic><topic>MESURE</topic><topic>MODELE</topic><topic>MODELOS</topic><topic>NUTRIENT TRANSPORT</topic><topic>Plant biology</topic><topic>Plant growth</topic><topic>Sap flow</topic><topic>Sensors</topic><topic>Stems</topic><topic>Temperature gradients</topic><topic>Transpiration</topic><topic>TRANSPORT DES SUBSTANCES NUTRITIVES</topic><topic>TRANSPORTE DE NUTRIENTES</topic><topic>VITIS VINIFERA</topic><topic>Water consumption</topic><topic>Water relations, transpiration, stomata</topic><topic>Water use</topic><topic>XILEMA</topic><topic>XYLEM</topic><topic>Xylem vessels</topic><topic>XYLEME</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Braun, P. (Bonn Univ. (Germany). 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(Bonn Univ. (Germany). Inst. fuer Obstbau und Gemuesebau)</au><au>Schmid, J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Sap flow measurements in grapevines (Vitis vinifera L.). 2. Granier measurements</atitle><jtitle>Plant and soil</jtitle><date>1999-01-01</date><risdate>1999</risdate><volume>215</volume><issue>1</issue><spage>47</spage><epage>55</epage><pages>47-55</pages><issn>0032-079X</issn><eissn>1573-5036</eissn><coden>PLSOA2</coden><abstract>The Granier-system, a relatively simple and continuous method for measuring sap flux density, has been adapted and evaluated for its use in older, mature grapevines. The original calibration of Granier (1985, Annales Sciences Forestieres, 42, 193-200) could be extended to a sap flux density of up to 400 10⁻⁶ m³ m⁻² s⁻¹ with only little error at high flux densities. A time lag of around 20 min was apparent between transpiration and calculated sap flow which was attributed to the thermal mass of the sensors themselves. The time lag and the consequently dampened response of the system caused a very low accuracy over short time periods thus reducing the value for detailed plant physiological investigations. However, when integrating over longer time intervals, much of the error cancelled out. For daily values the maximum error was within ± 10% and after a period of 89 days only 1.5% error remained. This method is thus best suited for long term measurements of total water use.</abstract><cop>Dordrecht</cop><pub>Kluwer Academic Publishers</pub><doi>10.1023/A:1004708119821</doi><tpages>9</tpages></addata></record> |
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| subjects | Agronomy. Soil science and plant productions Biological and medical sciences Economic plant physiology Flow measurement Flow velocity Fluctuations Flux density Fundamental and applied biological sciences. Psychology Heat balance MEASUREMENT MEDICION MESURE MODELE MODELOS NUTRIENT TRANSPORT Plant biology Plant growth Sap flow Sensors Stems Temperature gradients Transpiration TRANSPORT DES SUBSTANCES NUTRITIVES TRANSPORTE DE NUTRIENTES VITIS VINIFERA Water consumption Water relations, transpiration, stomata Water use XILEMA XYLEM Xylem vessels XYLEME |
| title | Sap flow measurements in grapevines (Vitis vinifera L.). 2. Granier measurements |
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