. The vegetation of the Siberian-Mongolian frontiers (the Sayansk region). Botany; Botany. currant- and black-currant bushes were seen, strangely enough, to cover nearly exclusi- vely the mountain sides, thousands of bushes forming, as it were, one continuous garden. About Ujuk there occur small quantities of Devonian sandstone forced into the eruptives, and farther down the Soyote Steppe the Devonian sandstone is nearly sole prevailing again. Towards Ujuk the mountain's become lower and more rounded; the primeval forest — the moist taiga — gradually retreats again, and the wood becomes more o
. The vegetation of the Siberian-Mongolian frontiers (the Sayansk region). Botany; Botany. currant- and black-currant bushes were seen, strangely enough, to cover nearly exclusi- vely the mountain sides, thousands of bushes forming, as it were, one continuous garden. About Ujuk there occur small quantities of Devonian sandstone forced into the eruptives, and farther down the Soyote Steppe the Devonian sandstone is nearly sole prevailing again. Towards Ujuk the mountain's become lower and more rounded; the primeval forest — the moist taiga — gradually retreats again, and the wood becomes more open and lighter, with an admixture of larches and various foliage trees bearing an unmistakable evidence of a drier climate. In this region it is very interesting to study the. Fig. 63. From the Bei-kem v;\lley, near Utinski porog. The wood on the right side has been ravaged by I'orest-fire. steppe and the taiga fighting for the upper hand. Gradually the larch-forest with its attending flora becomes nearly sole prevailing on the drier and warmer southern slopes, while the taiga proper is now only to be found on the cooler and moister northern slopes. But here, too, it is also at first by degrees mixed up with and later on altogether replaced by the larch, whereby the last remains of the moist taiga, which were to be found in the tracts between" Sebi and Ujuk, have disappeared. Here we find ourselves once more in a transition zone, which, as to floristic conditions, is to be referred to the wooded steppes. But soon it also becomes too dry for the larch: it begins thinning, at first on declivities with a southern aspect, and is here slowly but surely forced to yield for the benefit of a more xerophilous vegetation pressing forward, so as to constitute a completely woodless and pure steppe scenery here. Thus, the soutliern 92. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appeara
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
