By James White (auth.), J. White (eds.)

The guide of crops technology is turning out to be. After the 1st volumes und er my editorship have seemed the curiosity of the clinical group has been revived and lots of new quantity editors have began their paintings. the current quantity wasjointly designed by means of Drs. J. White and W. Beeftink. because of unforseen advancements Dr. White indicators now because the sole editor. the improvement of this quantity in the sequence had a unique heritage as Dr. White pointsout in his preface. including to this i want in simple terms to country that i discovered it necessary to comprise the subject of this quantity right into a Hand­ e-book of crops technology. lt was once integrated accordingly in my first revised Iist of themes to be incorporated within the instruction manual whilst I took over from Dr. Tüxen. it's a nice excitement for me to work out this quantity look. Having learn throughout the many contributions to this quantity i will definitely congratu­ past due Drs. White and Beeftink for his or her luck in producing rather a lot curiosity during this quantity between their colleagues. The cooperation in this quantity is forme the 1st signal that the hot thought of the guide has been understood via the iteration of scientists which i must deal with. The effect this quantity can have at the box ofplant inhabitants stories simply time can teil. it sounds as if to me, even though, that this quantity turns into a regular source for a few destiny. Dr. White requested me to have this quantity devoted to Dr. Rabotnov.

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1979) Das Wiederauftauchen aussterbender Pflanzen und Pflanzengesellschaften auf anthropogenen Standorten. In: Wilmanns, 0. and Tüxen, R. ): Werden 30 und Vergehen von Pflanzengesellschaften (Ber. Intern. Symp. IVV Rinteln 1978, Tüxen, R. )): 315- 326. Cramer, Vaduz. Kuoch, R. and Amiet, R. (1970) Die Verjüngung im Bereich der oberen Waldgrenze der Alpen. Mitt. Schweiz. d. Forst!. Versuchswesen 46: 159-342. G. (1965) A Relation theoretical approach to pattern and process in vegetation. Wentia 15: 25-46.

Krause (1979) observed that after soil disturbance species of the Littorellion and the Artemisietea vulgaris, which bad vanished for decades, unexpectedly reappeared. These and other examples suggest the idea, which must be demographically verified, that plants typical of small, ephemeral habitats in the original Iandscape of the temperature zone tend to build up a seed bank. 22 THE DEVELOPMENT OF POPULATIONS Phytosocio/ogical relevance of /ife cyc/es Species with a very short life cycle occur in a forrnation-determining abundance only in short-terrn habitats.

I would like to disavow at the outset that I regard this essay as merely historical. The importance of censuses grows with their repetition and I shall show that many early plant census records either continue to be kept or have been kept for very long periods. Plant demographers have access to a few extensive series of censuses (up to 70 years) which have hitherto been inadequately explored or appreciated by all but a handful ofbiologists. The importance ofthese data increases with their updating: I hope that by documenting them I shall contribute to their continued maintenance as irreplaceable information for a science of plant demography.

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The Population Structure of Vegetation by James White (auth.), J. White (eds.)
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