Light in Relation to Tree Growth by Raphael Zon - Bookswagon
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Home > Biographies & Memoire > Biography and non-fiction prose > Anthologies: general > Light in Relation to Tree Growth
Light in Relation to Tree Growth

Light in Relation to Tree Growth


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...The leaves of beech, for instance, in light are characterized by a dark-green color on their upper surface and Fig. 5.--Cross section of a spruce needle, a, Grown in the shade; 6, grown in full light. strongly developed palisade tissue; in the shade they have a lightgreen surface, and are made up almost exclusively of spongy parenchyma. Leaves in light often have a crumpled surface and are frequently more densely covered with hair than leaves in the shade; the veins of leaves in light are also developed more strongly; and, finally, the thickness of the leaf is closely connected with the structure, a shaded leaf being so thin and limp that it readily rolls itself into a small tube, while the leaf in light has a dense structure. (See figs. 4 and 5.) In Table 5 is given a comparative thickness of leaf tissues. Table 5.--Comparative thickness of leaf tissues m micromillimeters. Some shade-enduring plants, as Oxalis, for instance, when exposed to strong light become sickly, since they are unable to modify the mesophyllum of the leaves. The other extreme is shown by lightloving species, such as Peucedanum, which are unable to endure shade. Trees occupy an intermediate position between these two extremes. They are capable of adapting themselves more or less, especially those species whose life tissues may be either chiefly in the form of a spongy parenchyma or chiefly in the form of a palisade parenchyma, in accordance with the light intensity. The stronger the parenchyma tissues developed, the more intolerant is the species, and vice versa. Therefore, by the thickness of the parenchyma of shaded leaves, especially of the palisade parenchyma, it is possible to determine the comparative adaptability of species to shading. Suroj (1891), on the basis of his experimen...


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Product Details
  • ISBN-13: 9781130261516
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1130261514
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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