Response of Eucalyptus grandis trees to soil water deficits

Response of Eucalyptus grandis trees to soil water deficits The use of potential transpiration models to simulate transpiration rates in areas prone to soil water deficits leads to overestimates of water use as the soil dries. Therefore, I carried out studies on Eucalyptus grandis W. Hill ex Maiden trees subjected to soil drying at two field sites in the Mpumalanga province of South Africa to determine the relation between transpiration rate and soil water availability. I hypothesized that, with this relationship defined, simple modeling of the soil water balance could be used to predict what fraction of potential transpiration was taking place at a given time. Site 1 supported a stand of 3-year-old E. grandis trees, whereas 9-year-old trees were growing on Site 2, situated 2 km away. At each site, plastic sheeting was laid over the ground to prevent soil water recharge and thereby allow the roots in the soil to induce a continuous progressive depletion of soil water. Measurements of predawn xylem pressure potential, leaf area index, growth and sap flow rates revealed that prevention of soil water recharge resulted in only moderate drought stress. At Site 1, the trees abstracted water down to 8 m below the surface, whereas trees at Site 2 obtained most of their water from depths below 8 m. I found that modeling the water balance of deep rooting zones is impractical for the purpose of simulating nonpotential transpiration rates because of uncertainties about the depth of the root system, the soil water recharge mechanism and the water retention characteristics of the deep subsoil strata. I conclude that predicting the occurrence and severity of soil water deficits from the soil water balance is not feasible at these sites. Key words drought stress sap flow soil water abstraction transpiration © 1996 Heron Publishing—Victoria Canada « Previous | Next Article » Table of Contents This Article Tree Physiol (1996) 16 (1-2): 233-238. doi: 10.1093/treephys/16.1-2.233 » Abstract Free Full Text (PDF) Free Classifications Original Article Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Similar articles in PubMed Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by Dye, P. J. Search for related content PubMed PubMed citation Articles by Dye, P. J. Related Content Load related web page information Share Email this article CiteULike Delicious Facebook Google+ Mendeley Twitter What's this? Search this journal: Advanced » Current Issue November 2015 35 (11) Alert me to new issues The Journal About this journal Rights & permissions We are mobile – find out more This journal is a member of the Committee on Publication Ethics (COPE) Journals Career Network Impact factor: 3.655 5-Yr impact factor: 3.787 Ram Oren, Editor-in-Chief Torgny Näsholm, Associate Editor-In-Chief Sari Palmroth, Managing Editor View the full editorial board For Authors Instructions to authors Services for authors Online submission instructions Submit Now! Author Self Archiving Policy Open access options available for authors - visit Oxford Open Corporate Services What we offer Advertising sales Reprints Supplements Alerting Services Email table of contents XML RSS feed var taxonomies = ("SCI01210"); Most Most Read Nutrition of mangroves Relationships of tree height and diameter at breast height revisited: analyses of stem growth using 20-year data of an even-aged Chamaecyparis obtusa stand A method for routine measurements of total sugar and starch content in woody plant tissues Non-structural carbohydrates in woody plants compared among laboratories Size, shape and surface morphology of starch granules from Norway spruce needles revealed by transmission electron microscopy and atomic force microscopy: effects of elevated CO2 concentration » View all Most Read articles Most Cited Scaling of angiosperm xylem structure with safety and efficiency Evaluation of transpiration in a Douglas-fir stand by means of sap flow measurements A mathematical and statistical analysis of the curves illustrating vulnerability of xylem to cavitation Carbon dynamics in trees: feast or famine? Nighttime transpiration in woody plants from contrasting ecosystems » View all Most Cited articles Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department. Online ISSN 1758-4469 - Print ISSN 0829-318X Copyright © 2015 Oxford University Press Oxford Journals Oxford University Press Site Map Privacy Policy Cookie Policy Legal Notices Frequently Asked Questions Other Oxford University Press sites: Oxford University Press Oxford Journals China Oxford Journals Japan Academic & Professional books Children's & Schools Books Dictionaries & Reference Dictionary of National Biography Digital Reference English Language Teaching Higher Education Textbooks International Education Unit Law Medicine Music Online Products & Publishing Oxford Bibliographies Online Oxford Dictionaries Online Oxford English Dictionary Oxford Language Dictionaries Online Oxford Scholarship Online Reference Rights and Permissions Resources for Retailers & Wholesalers Resources for the Healthcare Industry Very Short Introductions World's Classics function fnc_onDomLoaded() { var query_context = getQueryContext(); PF_initOIUnderbar(query_context,":QS:default","","JRN"); PF_insertOIUnderbar(0); }; if (window.addEventListener) { window.addEventListener('load', fnc_onDomLoaded, false); } else if (window.attachEvent) { window.attachEvent('onload', fnc_onDomLoaded); } var gaJsHost = (("https:" == document.location.protocol) ? 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Response of Eucalyptus grandis trees to soil water deficits

Tree Physiology, Volume 16 (1-2) – Jan 1, 1996

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Oxford University Press
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Copyright © 2015 Oxford University Press
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0829-318X
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1758-4469
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10.1093/treephys/16.1-2.233
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Abstract

The use of potential transpiration models to simulate transpiration rates in areas prone to soil water deficits leads to overestimates of water use as the soil dries. Therefore, I carried out studies on Eucalyptus grandis W. Hill ex Maiden trees subjected to soil drying at two field sites in the Mpumalanga province of South Africa to determine the relation between transpiration rate and soil water availability. I hypothesized that, with this relationship defined, simple modeling of the soil water balance could be used to predict what fraction of potential transpiration was taking place at a given time. Site 1 supported a stand of 3-year-old E. grandis trees, whereas 9-year-old trees were growing on Site 2, situated 2 km away. At each site, plastic sheeting was laid over the ground to prevent soil water recharge and thereby allow the roots in the soil to induce a continuous progressive depletion of soil water. Measurements of predawn xylem pressure potential, leaf area index, growth and sap flow rates revealed that prevention of soil water recharge resulted in only moderate drought stress. At Site 1, the trees abstracted water down to 8 m below the surface, whereas trees at Site 2 obtained most of their water from depths below 8 m. I found that modeling the water balance of deep rooting zones is impractical for the purpose of simulating nonpotential transpiration rates because of uncertainties about the depth of the root system, the soil water recharge mechanism and the water retention characteristics of the deep subsoil strata. I conclude that predicting the occurrence and severity of soil water deficits from the soil water balance is not feasible at these sites. Key words drought stress sap flow soil water abstraction transpiration © 1996 Heron Publishing—Victoria Canada « Previous | Next Article » Table of Contents This Article Tree Physiol (1996) 16 (1-2): 233-238. doi: 10.1093/treephys/16.1-2.233 » Abstract Free Full Text (PDF) Free Classifications Original Article Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Similar articles in PubMed Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by Dye, P. J. Search for related content PubMed PubMed citation Articles by Dye, P. J. Related Content Load related web page information Share Email this article CiteULike Delicious Facebook Google+ Mendeley Twitter What's this? Search this journal: Advanced » Current Issue November 2015 35 (11) Alert me to new issues The Journal About this journal Rights & permissions We are mobile – find out more This journal is a member of the Committee on Publication Ethics (COPE) Journals Career Network Impact factor: 3.655 5-Yr impact factor: 3.787 Ram Oren, Editor-in-Chief Torgny Näsholm, Associate Editor-In-Chief Sari Palmroth, Managing Editor View the full editorial board For Authors Instructions to authors Services for authors Online submission instructions Submit Now! Author Self Archiving Policy Open access options available for authors - visit Oxford Open Corporate Services What we offer Advertising sales Reprints Supplements Alerting Services Email table of contents XML RSS feed var taxonomies = ("SCI01210"); Most Most Read Nutrition of mangroves Relationships of tree height and diameter at breast height revisited: analyses of stem growth using 20-year data of an even-aged Chamaecyparis obtusa stand A method for routine measurements of total sugar and starch content in woody plant tissues Non-structural carbohydrates in woody plants compared among laboratories Size, shape and surface morphology of starch granules from Norway spruce needles revealed by transmission electron microscopy and atomic force microscopy: effects of elevated CO2 concentration » View all Most Read articles Most Cited Scaling of angiosperm xylem structure with safety and efficiency Evaluation of transpiration in a Douglas-fir stand by means of sap flow measurements A mathematical and statistical analysis of the curves illustrating vulnerability of xylem to cavitation Carbon dynamics in trees: feast or famine? Nighttime transpiration in woody plants from contrasting ecosystems » View all Most Cited articles Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department. Online ISSN 1758-4469 - Print ISSN 0829-318X Copyright © 2015 Oxford University Press Oxford Journals Oxford University Press Site Map Privacy Policy Cookie Policy Legal Notices Frequently Asked Questions Other Oxford University Press sites: Oxford University Press Oxford Journals China Oxford Journals Japan Academic & Professional books Children's & Schools Books Dictionaries & Reference Dictionary of National Biography Digital Reference English Language Teaching Higher Education Textbooks International Education Unit Law Medicine Music Online Products & Publishing Oxford Bibliographies Online Oxford Dictionaries Online Oxford English Dictionary Oxford Language Dictionaries Online Oxford Scholarship Online Reference Rights and Permissions Resources for Retailers & Wholesalers Resources for the Healthcare Industry Very Short Introductions World's Classics function fnc_onDomLoaded() { var query_context = getQueryContext(); PF_initOIUnderbar(query_context,":QS:default","","JRN"); PF_insertOIUnderbar(0); }; if (window.addEventListener) { window.addEventListener('load', fnc_onDomLoaded, false); } else if (window.attachEvent) { window.attachEvent('onload', fnc_onDomLoaded); } var gaJsHost = (("https:" == document.location.protocol) ? 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Tree PhysiologyOxford University Press

Published: Jan 1, 1996

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