See Recent Progress Report - GERS Laboratory at UPRM
See Recent Progress Report - GERS Laboratory at UPRM
See Recent Progress Report - GERS Laboratory at UPRM
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the canopy, where it s<strong>at</strong>ellite based detectors would be able to see influence of the metal<br />
on the chlorophyll production and hence on the reflectance p<strong>at</strong>tern.<br />
The most complete set of d<strong>at</strong>a <strong>at</strong> this moment are the chemical analyses of a red<br />
mangrove (rhyzophora mangle) in the Guayanilla Mangrove area. Cd and Ni are low and<br />
Cu and Pb show a considerable content. It is not clear yet how significant the difference<br />
between the lower, middle and top leaves is. St<strong>at</strong>istical analyses are planned to<br />
investig<strong>at</strong>e this. The presence of Cu and Pb in the leaves probably reflects the presence of<br />
these metals in the substr<strong>at</strong>e. Analyses for Hg and As will be carried out this semester.<br />
Chemical have been purchased to be able to do these analyses.<br />
The d<strong>at</strong>a presented for Joyuda look suspect. The substr<strong>at</strong>e contains considerable amounts<br />
of Ni and Co (Table 1). The Cu in the leaves may be a reflection of the Cu in the<br />
substr<strong>at</strong>e, but previous analyses showed a high content of Ni, so there is a possibility of<br />
mix up of the analytical d<strong>at</strong>a. This possibility will be further investig<strong>at</strong>ed.<br />
Reflectance measurements<br />
The reflectance of the red mangrove leaves was measured using the GER 1500<br />
radiospectrometer.<br />
Reflectance of Red Mangrove Guayanilla Loc. 2 Bottom Level<br />
0.8<br />
0.7<br />
0.8<br />
Reflectance of Red Mangrove Loc. 2 Middle Level<br />
0.6<br />
0.7<br />
0.5<br />
Loc. 2 Leaf 1 Bottom<br />
0.6<br />
Reflectance<br />
0.4<br />
0.3<br />
Loc. 2 Leaf 2 Bottom<br />
Loc. 2 Leaf 3 Bottom<br />
Loc. 2 Leaf 4 Bottom<br />
Loc. 2 Leaf 5 Bottom<br />
Reflectance<br />
0.5<br />
0.4<br />
0.3<br />
Loc. 2 Leaf 1 Middle<br />
Loc. 2 Leaf 2 Middle<br />
Loc. 2 Leaf 3 Middle<br />
Loc. 2 Leaf 4 Middle<br />
Loc. 2 Leaf 5 Middle<br />
0.2<br />
0.2<br />
0.1<br />
0.1<br />
0<br />
400 500 600 700 800 900<br />
Wavelength<br />
0<br />
400 500 600 700 800 900<br />
Wavelenght<br />
Reflectance of Red Mangrove Guayanilla Loc. 2 Top Level<br />
0.8<br />
0.7<br />
0.6<br />
Reflectance<br />
0.5<br />
0.4<br />
0.3<br />
Loc. 2 Leaf 1 Top<br />
Loc. 2 Leaf 2 Top<br />
Loc. 2 Leaf 3 Top<br />
Loc. 2 Leaf 4 Top<br />
Loc. 2 Leaf 5 Top<br />
0.2<br />
0.1<br />
0<br />
400 500 600 700 800 900<br />
Wavelength<br />
Figure 4 Reflectance p<strong>at</strong>terns of Red mangrove (Rhyzophora mangle) of Guayanilla<br />
loc<strong>at</strong>ion 2. The three subfigures are the reflectance p<strong>at</strong>terns of the lower, middle and top<br />
leaves of the tree.