boreas | R Documentation |
Four data sets from the Boreal Ecosystem–Atmosphere Study (BOREAS, Rich and Fournier 1999), as used by García (2006). These are approximately evenaged and single-species unmanaged natural forests, from a northern study area in Manitoba and a southern study area in Saskatchewan, central Canada. Tree coordinates and diameters at breast height (dbh) were measured for all trees taller than 2 m on areas of 50 m x 60 m, subdivided into subplots on a 10 m grid. Tree heights were estimated from height-dbh regressions based on a sample of height measurements. The data here excludes dead trees, and also excludes some trees with coordinates just outside the observation window.
The 4 data sets are:
boreasNP
:Northern study area, Jack pine
boreasNS
:Northern study area, black spruce
boreasSA
:Southern study area, trembling aspen
boreasSP
:Southern study area, Jack pine
Each data set is a spatstat marked point pattern object (class ppp
). The marks are a data frame with dbh
(cm), height
(m), species
, a dominance
classification, and a subplot id.
doi: 10.3334/ORNLDAAC/359
Rich, P.M., and Fournier, R. (1999) BOREAS TE-23 map plot data [online]. Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee. Available from http://daac.ornl.gov.
García, O. (2006) Scale and spatial structure effects on tree size distributions: Implications for growth and yield modelling. Canadian Journal of Forest Research 36(11), 2983–2993. doi: 10.1139/x06-116.
summary(boreasNP) plot(boreasNP) ## Not run: aNP <- assimilation(boreasNP) # this may take a few minutes!
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