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 ve...... 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 s...... 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 COCK...... 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 m...... 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 fo...... 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 ...... 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 Brue...... 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 siz...... 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 di...... hiện toàn bộ