Author: G. Erdtman
Publisher: Read Books Ltd
ISBN: 1447494768
Category : Science
Languages : en
Pages : 260
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AN INTRODUCTION TO POLLEN ANALYSIS by G. ERDTMAN. FOREWORD: It has long been the custom among those making pollen surveys to expose microscope slides coated with a suitable adhesive and examine them for the pollen grains caught. The counts of the various species are tabulated each day and at the end of the season drawn into a graph or pollen spectrum, as it is called , which gives a clear picture of the relative amounts of the different kinds of pollen which are floating in the air from day to day throughout the growing season If done in the north temperate zone such a spectrum will show the pollen of the early flowering trees, at first a trickle, as the junipers, alders and hazels flower, then a deluge as the birches, oaks and pines ami many other trees cast their pollen to the air. This is generally followed by a long stream of grass pollen, fluctuating from week to week as the various species come into flower, reach their zenith, then die out giving way to succeeding species And toward the end of the summer pollens of the late flowering weeds make their appearance, nowadays in most places com pletely dominated by that of the ragweed. If the record is repeated the following year the spectrum will be nearly the same The succession can be counted on to repeat itself with hltle change from year to year for many years to come, unless some cataclysm changes the surrounding vegetation which contributes to the pollen spectrum, for it is always a faithful representation of the surrounding vegetation...
Author: Gunnar Erdtman
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: G Erdtman
Publisher: Hassell Street Press
ISBN: 9781014268044
Category :
Languages : en
Pages : 270
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This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: G Erdtman
Publisher: Scholar's Choice
ISBN: 9781296027872
Category :
Languages : en
Pages : 266
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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: R. L. Jones
Publisher:
ISBN: 9780860940227
Category : Palynology
Languages : en
Pages : 43
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Author: Gunnar Erdtman
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 194
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Author: Gunnar Erdtman
Publisher: Brill Archive
ISBN: 9789004081222
Category : Nature
Languages : en
Pages : 576
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Author: Knut Faegri
Publisher:
ISBN:
Category : Palynology
Languages : en
Pages : 295
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Author: Peter Dale Moore
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Knut Faegri
Publisher:
ISBN:
Category :
Languages : en
Pages : 328
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