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Average Seasonal Phytomass: A Temporally Independent Index of Herbaceous Plant Dominance

N. E. West and G. A. Reese
Vegetatio
Vol. 57, No. 2/3 (Nov. 30, 1984), pp. 137-141
Published by: Springer
Stable URL: http://www.jstor.org/stable/20146118
Page Count: 5
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Average Seasonal Phytomass: A Temporally Independent Index of Herbaceous Plant Dominance
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Abstract

Diversity, similarity and dominance in plant communities are usually assessed from data collected at a single date. Herbaceous species have differing periods of growth, making phytomass or cover-weighted indices of diversity, similarity or dominance highly dependent on the timing of data collection. A new way of mathematically expressing residence time is presented. Average seasonal phytomass values can be used to better express dominance throughout a growing season. A similar approach could be used for cover or any other dynamic property of plant growth. These values could then be used in dominance-weighted indices of community similarity and diversity.

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