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PRELIMINARY STUDIES ON SAPFLOW IN COCOS NUCIFERA L.
Author(s) -
MILBURN JOHN A.,
ZIMMERMANN MARTIN H.
Publication year - 1977
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1977.tb02238.x
Subject(s) - xylem , cocos nucifera , environmental science , morning , transpiration , botany , biology , agronomy , atmospheric sciences , photosynthesis , geology
SUMMARY A technique has been devised to study changes in the xylem‐sap tensions in Cocos using a pressure bomb. Preliminary studies indicate that xylem tensions range from 2 to 13 bar depending on solar radiation and other environmental changes. One surprising observation is that xylem sap tensions are somewhat lower in the dry season, apparently due to earlier stomatal closure during the mid‐late morning. Despite the close proximity of lagoons of saline water, there was no indication that the uptake of water was reduced through osmosis, and a hidden supply of fresh water is implied. Finally, some precautions are listed which avoid certain anomalous results using the pressure bomb.