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| Titel |
Variation in photosynthetic and nonphotosynthetic vegetation along edaphic and compositional gradients in northwestern Amazonia |
| VerfasserIn |
M. A. Higgins, G. P. Asner, E. Perez, N. Elespuru, A. Alonso |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 13 ; Nr. 11, no. 13 (2014-07-03), S.3505-3513 |
| Datensatznummer |
250117501
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| Publikation (Nr.) |
 copernicus.org/bg-11-3505-2014.pdf |
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| Zusammenfassung |
| Tropical forests vary substantially in aboveground properties such as canopy
height, canopy structure, and plant species composition, corresponding to
underlying variations in soils and geology. Forest properties are often
difficult to detect and map in the field, however, due to the remoteness and
inaccessibility of these forests. Spectral mixture analysis of Landsat
imagery allows mapping of photosynthetic and nonphotosynthetic vegetation
quantities (PV and NPV), corresponding to biophysical properties such as
canopy openness, forest productivity, and disturbance. Spectral unmixing has
been used for applications ranging from deforestation monitoring to
identifying burn scars from past fires, but little is known about variations
in PV and NPV in intact rainforests. Here we use spectral unmixing of Landsat
imagery to map PV and NPV in northern Amazonia, and to test their
relationship to soils and plant species composition. To do this we sampled
117 sites crossing a geological boundary in northwestern Amazonia for soil
cation concentrations and plant species composition. We then used the
Carnegie Landsat Analysis System to map PV and NPV for these sites from
multiple dates of Landsat imagery. We found that soil cation concentrations
and plant species composition consistently explain a majority of the
variation in remotely sensed PV and NPV values. After combining PV and NPV
into a single variable (PV–NPV), we determined that the influence of soil
properties on canopy properties was inseparable from the influence of plant
species composition. In all cases, patterns in PV and NPV corresponded to
underlying geological patterns. Our findings suggest that geology and soils
regulate canopy PV and NPV values in intact tropical forests, possibly
through changes in plant species composition. |
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