An Introduction to Vegetation Analysis: Principles, practice by David Causton

By David Causton

TO plants research ideas, perform and interpretation D.R.CAUSTON division of Botany and Microbiology, college collage of Wales, Aberystwyth London UNWIN HYMAN Boston Sydney Wellington © D. R. Causton, 1988 This e-book is copyright lower than the Berne conference. No copy with out permission. All rights reserved. released by way of the tutorial department of Unwin Hyman Ltd 15/17 Broadwick highway, London W1V 1FP, united kingdom Allen & Unwin Inc., eight Winchester position, Winchester, Mass. 01890, united states Allen & Unwin (Australia) Ltd, eight Napier road, North Sydney, NSW 2060, Australia Allen & Unwin (New Zealand) Ltd in organization with the Port Nicholson Press Ltd, 60 Cambridge Terrace, Wellington, New Zealand First released in 1988 British Library Cataloguing in e-book information Causton, David R. An advent to plants research: rules, perform and intepretation. 1. Botany-Ecology-Mathematics I. name 581.5'247 QK901 ISBN-13: 978-0-04-581025-3 e-ISBN-13: 978-94-011-7981-2 DOl: 10.1007/978-94-011-7981-2 Library of Congress Cataloging-in-Publication info Causton, David R. An creation to plants research. Bibliography: p. contains index. 1. Botany-Ecology-Methodology. 2. Plant communities-Research-Methodology. three. crops surveys. four. crops type. I. identify. QK90I.C33 1987 581.5 87-19327 ISBN-13: 978-0-04-581025-3 Typeset in 10 on 12 aspect instances by way of Mathematical Composition Setters Ltd, Salisbury and Biddies of Guildford Preface This e-book has been written to assist scholars and their academics, at numerous degrees, to appreciate the rules, many of the equipment, and methods of examining vegetational and environmental information got within the box.

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For large- or small-scale primary surveys using quadrats for mapping, qualitative data should be suitable. For most other work it is worthwhile to collect quantitative data. This particularly applies to the commoner species in the data set; but since it is not always apparent before the field work is carried out which are the commoner species, it means that all species should be quantitatively assessed. Although, as we'shall see, only qualitative data are required for classifications and may also be preferable for ordinations of primary survey data, quantitative records can provide valuable additional information (see the case studies).

In any set of vegetation data the species present will cover a wide span of frequencies. Only extremely rarely will any species occur in every stand but, at the other end of the scale, there will always be a number of species present which occur in only one stand of the data set. The question to discuss now is, should species with a low occurrence in the data set (one stand only, or perhaps two or even three or more, depending on the total number of stands in the data set) be eliminated before analysis?

When carrying out detailed work on one or a few species, abundance is of much greater interest, and the analytical methods are different. e. the methods described in Chapters 6 and 7. 41 PRINCIPLES OF ANALYTICAL METHODS Species of low oeeurreaee ia • tIata . - retaIII or tIiseanl1 The fmal section of this chapter is concerned with a problem which, at first sight, would be thought trivial. In any set of vegetation data the species present will cover a wide span of frequencies. Only extremely rarely will any species occur in every stand but, at the other end of the scale, there will always be a number of species present which occur in only one stand of the data set.

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