Predicting the water-use of Eucalyptus nitens plantations in ...
Predicting the water-use of Eucalyptus nitens plantations in ...
Predicting the water-use of Eucalyptus nitens plantations in ...
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6. F<strong>in</strong>al <strong>water</strong>-<strong>use</strong> function<br />
The recommended function for <strong>in</strong>clusion <strong>in</strong> <strong>the</strong> FEM to estimate E. <strong>nitens</strong> <strong>water</strong>-<strong>use</strong> <strong>in</strong><br />
Tasmania is:<br />
WU = 149+11.0*BA+0.361*R Equation 1.<br />
Where WU is <strong>water</strong>-<strong>use</strong> <strong>in</strong> mm/yr, BA is plot basal area <strong>in</strong> m 2 /ha, and R is ra<strong>in</strong>fall <strong>in</strong> mm/yr.<br />
This function is better than <strong>the</strong> Roberts (2011A) function (Figure 4.) beca<strong>use</strong> it allows <strong>water</strong><strong>use</strong><br />
to be varied <strong>in</strong> response to differences <strong>in</strong> annual ra<strong>in</strong>fall.<br />
Maps <strong>of</strong> ra<strong>in</strong>fall isohyets are available for Tasmania. Grids and shape files for ra<strong>in</strong>fall can be<br />
downloaded from http://www.bom.gov.au/jsp/ncc/climate_averages/ra<strong>in</strong>fall/<strong>in</strong>dex.jsp and<br />
could potentially be <strong>in</strong>cluded <strong>in</strong> <strong>the</strong> FEM, or, if more detailed ra<strong>in</strong>fall data are desired, actual<br />
data or syn<strong>the</strong>tic ra<strong>in</strong>fall data from Silo Data drill for specific sites could be <strong>in</strong>cluded <strong>in</strong> <strong>the</strong><br />
FEM.<br />
Inclusion <strong>of</strong> potential evaporation maps to set <strong>the</strong> upper limit for <strong>water</strong>-<strong>use</strong> would prevent<br />
estimates <strong>of</strong> <strong>water</strong>-<strong>use</strong> be<strong>in</strong>g made that exceed what is physically possible. Grids and shape<br />
files for potential evaporation can be downloaded from<br />
http://www.bom.gov.au/jsp/ncc/climate_averages/evaporation/<strong>in</strong>dex.jsp .<br />
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