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- W2339584549 abstract "THAT destructive soil heaving is not due significantly to the expansion of soil water on freezing in situ in the soil interstices but to the freezing of water progressively segregated from the soil, has been known for a long time. And the relation of this established fact to the mechanism of frost heaving of plants has, at least in a general way, been understood in certain quarters for many years. With the former, geologists and engineers especially are well acquainted. The importance of soil frost phenomena in railroad, highway, and airport construction has stimulated much research, as has the recent marked increase of interest in the arctic regions. But with the latter, i.e., the precise mechanism of frost heaving of plants, botanists-including many ecologists and foresters -appear on the whole to have little acquaintance. This is the more surprising since botanists (von Mohl, 1860; Sachs, 1860) made important contributions fundamental to an understanding of the process; and half a century later a forester (Hesselman, 1907) applied this theoretical knowledge in correctly explaining the heaving of tree seedlings. In the light of the foregoing there is an obligation to offer some justification for the present paper. For some years the writer has carried on plant colonization studies on black wastes from anthracite mining operations.' On one type of these wastes (culm or slush) frost heaving of tree seedlings occurs under certain conditions-in the same manner as on some soils, but on a scale so exaggerated as to offer unusual opportunity for studying the phenomenon. The nature of the culm and the magnitude of the heaves are such that the process is revealed with striking clarity. It is hoped that the present report will in some" @default.
- W2339584549 created "2016-06-24" @default.
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- W2339584549 date "2016-01-01" @default.
- W2339584549 modified "2023-09-27" @default.
- W2339584549 title "THE MECHANISM OF FROST HEAVING OF TREE SEEDLINGS" @default.
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