Publications by H. McCaughey
https://cfs.nrcan.gc.ca/authors/read/24941
Publications by H. McCaugheyen-ca2015-11-24 08:12:00 MST2015-11-24 08:12:00 MSTwebmaster@nofc.cfs.nrcan.gc.caMapping continuous forest type variation by means of correlating remotely sensed metrics to canopy N:P ratio in a boreal mixedwood forest.
https://cfs.nrcan.gc.ca/publications?id=36397
Questions: Can the ratio of nitrogen to phosphorus (N:P ratio) be predicted at
canopy level using imaging spectroscopy (IS) and light detection and ranging
(LiDAR) remote sensing data? How do temporal variation and difference in spa
tial resolution of these data sources affect prediction accuracy of the canopy N:P
ratio?
Location: Boreal mixedwood forest, northern Ontario, Canada.
Methods: Canopy N:P ratio was estimated using spectral indices calculated from
IS data at two spatial resolutions, airborne and space-borne, across two sum
mers. The relationship between the canopy N:P ratio and forest structure was
investigated through analysis of LiDAR data. The impact of temporal variation
on canopy N:P ratio and the different spatial resolution of IS data on prediction
accuracy for canopy N:P was addressed. Maps of canopy N:P ratio generated
from airborne and space-borne IS data were generated.
Results: Airborne and space-borne ISdata explained 70% and 69% of the vari
ation in canopy N:P, ratio, with predictions errors of 5.0% and 7.2%, respec
tively, in two consecutive years. Predictions differed significantly with changes
in spatial resolution. Predictive models obtained from LiDAR data explained
54% and 67% of the variation in canopy N:P ratio, with prediction errors of
6.1 % and 7.5%, respectively, for the 2 yrs.
Conclusions: The results show that canopy N:P ratio can be predicted with
remote sensing data based on the relationship between canopy N:P ratio and
crown closure at this site. The spatial variation due to the mixed deciduous and
coniferous forest type is the underlying mechanism that generates the observed
spatial pattern in canopy N:P ratio in this ecosystem, and the canopy N:P ratio
map displays this variation.Tue, 24 Nov 2015https://cfs.nrcan.gc.ca/publications?id=36397