VEGAN, a package of R functions for community ecology Tập 14 Số 6 - Trang 927-930 - 2003
Philip M. Dixon
Abstract. VEGAN adds vegetation analysis functions to the general‐purpose
statistical program R. Both R and VEGAN can be downloaded for free. VEGAN
implements several ordination methods, including Canonical Correspondence
Analysis and Non‐metric Multidimensional Scaling, vector fitting of
environmental variables, randomization tests, and various other analyses of
vegetation data. It can be used fo... hiện toàn bộ
Measuring phenological variability from satellite imagery Tập 5 Số 5 - Trang 703-714 - 1994
Bradley C. Reed, J. F. Brown, Darrel VanderZee, Thomas R. Loveland, James W. Merchant, Donald O. Ohlen
Abstract. Vegetation phenological phenomena are closely related to seasonal
dynamics of the lower atmosphere and are therefore important elements in global
models and vegetation monitoring. Normalized difference vegetation index (NDVI)
data derived from the National Oceanic and Atmospheric Administration's Advanced
Very High Resolution Radiometer (AVHRR) satellite sensor offer a means of
efficient... hiện toàn bộ
JUICE, software for vegetation classification Tập 13 Số 3 - Trang 451-453 - 2002
Lubomír Tichý
Abstract. The program JUICE was designed as a Microsoft® WINDOWS® application
for editing, classification and analysis of large phytosociological tables and
databases. This software, with a current maximum capacity of 30 000 relevés in
one table, includes many functions for easy manipulation of table and header
data. Various options include classification using COCKTAIL and TWINSPAN
methods, calcu... hiện toàn bộ
Challenging Theophrastus: A common core list of plant traits for functional ecology Tập 10 Số 5 - Trang 609-620 - 1999
Evan Weiher, Adrie van der Werf, Ken Thompson, Michael L. Roderick, Éric Garnier, Ove Eriksson
Abstract. Ecologists need a common language of plant traits in order to make
comparisons across regions and scales, pool data, and maximize the utility of
the data. To develop such a set of traits we began with the primary challenges
faced by plants: dispersal, establishment, and persistence in order to identify
fundamental traits. Most of these traits are hard to measure, but advances in
comparat... hiện toàn bộ
TURBOVEG, a comprehensive data base management system for vegetation data Tập 12 Số 4 - Trang 589-591 - 2001
S.M. Hennekens, J.H.J. Schaminée
Abstract. The computer software package TURBOVEG (for Microsoft® Windows®) was
developed in The Netherlands for the processing of phytosociological data. This
package comprises an easy‐to‐use data base management system. The data bank to
be managed can be divided into several data bases which may consist of up to 100
000 relevés each. The program provides methods for input, import, selection, and
... hiện toàn bộ
The Circumpolar Arctic vegetation map Tập 16 Số 3 - Trang 267-282 - 2005
Donald A. Walker, Martha K. Raynolds, Fred J.A. Daniëls, Eyþór Einarsson, Arve Elvebakk, William A. Gould, A. E. Katenin, S. S. Kholod, Carl J. Markon, E. S. Melnikov, Natalia G. Moskalenko, Stephen S. Talbot, Boris A. Yurtsev, The other members of the CAVM Team
Abstract. Question: What are the major vegetation units in the Arctic, what is
their composition, and how are they distributed among major bioclimate subzones
and countries?Location: The Arctic tundra region, north of the tree
line.Methods: A photo‐interpretive approach was used to delineate the vegetation
onto an Advanced Very High Resolution Radiometer (AVHRR) base image. Mapping
experts within ... hiện toàn bộ
Determination of diagnostic species with statistical fidelity measures Tập 13 Số 1 - Trang 79-90 - 2002
Milan Chytrý, Lubomír Tichý, Jason Holt, Zoltán Botta‐Dukát
Abstract. Statistical measures of fidelity, i.e. the concentration of species
occurrences in vegetation units, are reviewed and compared. The focus is on
measures suitable for categorical data which are based on observed species
frequencies within a vegetation unit compared with the frequencies expected
under random distribution. Particular attention is paid to Bruelheide's u value.
It is shown th... hiện toàn bộ
Effects of fire on landscape heterogeneity in Yellowstone National Park, Wyoming Tập 5 Số 5 - Trang 731-742 - 1994
Monica G. Turner, William W. Hargrove, Robert H. Gardner, William H. Romme
Abstract. A map of burn severity resulting from the 1988 fires that occurred in
Yellowstone National Park (YNP) was derived from Landsat Thematic Mapper (TM)
imagery and used to assess the isolation of burned areas, the heterogeneity that
resulted from fires burning under moderate and severe burning conditions, and
the relationship between heterogeneity and fire size. The majority of severely
burn... hiện toàn bộ
Patterns of plant species richness in relation to different environments: An appraisal Tập 12 Số 2 - Trang 153-166 - 2001
Juli G. Pausas, M. P. Austin
Abstract. We review patterns of plant species richness with respect to variables
related to resource availability and variables that have direct physiological
impact on plant growth or resource availability. This review suggests that there
are a variety of patterns of species richness along environmental gradients
reported in the literature. However, part of this diversity may be explained by
the ... hiện toàn bộ
Reliability of Ellenberg indicator values for moisture, nitrogen and soil reaction: a comparison with field measurements Tập 11 Số 2 - Trang 225-244 - 2000
André P. Schaffers, Karlè V. Sýkora
Abstract. Ellenberg indicator values for moisture, nitrogen and soil reaction
were correlated with measured soil and vegetation parameters. Relationships were
studied through between‐species and between‐site comparisons, using data from 74
roadside plots in 14 different plant communities in The Netherlands forming a
wide range.Ellenberg moisture values correlated best with the average lowest
moist... hiện toàn bộ