Changes in hydraulic conductance of citrus trees following a reduction in wetted soil volume
作者:
Y. COHEN,
S. MORESHET,
M. FUCHS,
期刊:
Plant, Cell&Environment
(WILEY Available online 1987)
卷期:
Volume 10,
issue 1
页码: 53-57
ISSN:0140-7791
年代: 1987
DOI:10.1111/j.1365-3040.1987.tb02079.x
出版商: Blackwell Publishing Ltd
关键词: Cürirs siiicrrsis L. Osbeek;transpirotion;water polentlal
数据来源: WILEY
摘要:
AbstractThe effcct of the transition from fully to partially wetted soil voluine on transpiration rate and hydraulic conductance of mature citrus trees was examined in a 23‐year‐old, coninicrcial, sprinklerirrigated, Shanio u t i orange orchard. I rriga t i on frequency was determined by the rate of water loss from the soil, a s measured by neutron probes. The hydraulic conductance of tlic tree was coniputed from the rclationship between sap flow i n the trunk and leaf water potential. The diurnal valucs of leaf water potential and sap flow shifted towards lower levels as tlie water stored in the root zone was depleted. In the fully wetted soil volume the tree hydraulic conductance remained constant throughout the irrigation period, from June to Novcniber. However, partial wetting of the soil volume (40%) caused a reduction in the hydraulic conductance of the tree. Tlie decreased hydraulic conductance is attributed to tlie permanent interruption of water transport in part of tlie root system. Tlie rcsults of tlie experiment suggest that despite tlie increase of irrigation frequency, partial wetting intensifies water stress in tlie tr
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