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- W2020130774 abstract "A previous paper of this series (Griggs, 1933) has given an account of field work of the National Geographic Expedition of I930 on the revegetation of the country covered by ash from the eruption of Katmai in 19I2, wherein it was shown that the pioneer plants on pure ash deposits were leafy liverworts of the family Jungermanniaceae. The outstanding peculiarity of the ash upon which these plants were growing was the practical absence of nitrogen compounds. The obstacle to revegetation was, then, the difficulty of obtaining in available form the nitrogen necessary for the construction of protoplasm in conditions where the ordinary sources of such material almost totally fail. The field work showed that where even very slight organic contamination occurred ordinary plants could grow on the ash, but that in the pure uncontaminated ash nothing except the liverworts obtained a foothold. Thus, secondary deposits of wind-blown or water-laid ash were occupied by plants of many species, but the flora of the undisturbed ash consisted of a pure stand of liverworts. These in places bore a copious crop of sporophytes. The liverwort beds, covering acre after acre of ground, developed a heavy carpet far denser and more extensive than any liverwort growth in normal habitats. It was found, further, that the liverworts were the forerunners of other plants. Where they had occupied the ground longest, first mosses, then willows, and then grasses and other seed plants were coming in. It was clear that an understanding of the nitrogen relations of these plants could not be gained from field observations alone but would require cultural studies under controlled conditions in the laboratory. The present paper presents the results obtained to date on this problem." @default.
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- W2020130774 date "1934-05-01" @default.
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- W2020130774 title "GROWTH OF LIVERWORTS FROM KATMAI IN NITROGEN-FREE MEDIA" @default.
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- W2020130774 doi "https://doi.org/10.1002/j.1537-2197.1934.tb04962.x" @default.
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