[IAWA Forum] Fluid density altered by evaporation at the leaf?

From: "Andrew K Fletcher" <Gravity@blueyonder.co.uk>
Subject: [IAWA Forum] Fluid density altered by evaporation at the leaf?
Date: Tue, 4 Apr 2006 10:42:20 +0100

Next Article (by Subject): RE: [IAWA Forum] Fluid density altered by evaporation at the leaf? "Andrew K Fletcher"
Next in Thread: RE: [IAWA Forum] Fluid density altered by evaporation at the leaf? "Andrew K Fletcher"
Articles sorted by: [Date] [Author] [Subject]

This is a multi-part message in MIME format.

------=_NextPart_000_000D_01C657D4.736574F0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Question:

A tree loses up to 99% of all water drawn through the roots in the =
evaporation process. This is a huge evaporative process, which should =
have an effect on the residual liquid inside the leaf and the branches =
at the upper most part of the tree, given that the fluid passes from one =
leaf to another there should be a fair amount of concentration taking =
place with sugars produced by the leaf, and dissolved minerals from the =
soil.

Surely this must alter the density of the sap at the upper end of the =
tree? Or has someone got an explanation as to why this is not so?

Appreciate very much some of your thoughts on this puzzle.

Kindest regards

Andrew
------=_NextPart_000_000D_01C657D4.736574F0
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2900.2802" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>
<DIV><FONT face=3DArial size=3D2>Question:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>A tree loses up to 99% of all water =
drawn through=20
the roots in the evaporation process. This is a huge evaporative =
process, which=20
should have an effect on the residual liquid inside the leaf and the =
branches at=20
the upper most part of the tree, given that the fluid passes from one =
leaf to=20
another there should be a fair amount of concentration taking place with =
sugars=20
produced by the leaf, and dissolved minerals from the soil.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Surely this must&nbsp;alter the density =
of the sap=20
at the upper end of the tree? Or has someone got an explanation as to =
why this=20
is not so?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Appreciate very much some of your =
thoughts on this=20
puzzle.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Kindest regards</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial =
size=3D2>Andrew</FONT></DIV></FONT></DIV></BODY></HTML>

------=_NextPart_000_000D_01C657D4.736574F0--

======== Welcome All Anatomists! ==========
About this IAWA Discussion Group, subscribing, unsubscribing, and archives:
http://www.cof.orst.edu/org/IAWA
About the IAWA and/or the IAWA Journal:
http://www.kuleuven.ac.be/bio/sys/iawa
The International Association of Wood Anatomists

Go to OSU College of Forestry LWGate Home Page.