Identifier: ecologicalrelati00weav (find matches)
Title: The ecological relations of roots
Year: 1919 (1910s)
Authors: Weaver, John E. (John Ernest), 1884-1966
Subjects: Roots (Botany) Plant ecology
Publisher: Washington, Carnegie institution of Washington
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ing root habit of their predecessors of thegravel-slide, this is supplemented by a much deeper portion whichextracts water and nutrients below the 18-inch level, as well as verylargely from the second and third foot of soil. The surface-spreadingroots may be explained by the frequent mountain showers whichsupply water rather continuously to the shallow soils, while thedeeper-seated ones reflect the better deep-soil conditions, but especiallythe more intense competition for water of this denser population.The thick surface layer of loose rock fragments of the gravel-slide hashere become more disintegrated and closely packed, and soon givesway to soil. Hence water evaporates more freely. This, with thecompetition of the taller half-gravel-slide plants, accounts for thedisappearance of gravel-slide species. The former shade those oflesser height, but especially compete with them for water, undoubtedlyrelying upon their deeper penetrating roots during periods of drought. PLATE B S C E H B
Text Appearing After Image:
le front of thefmus triticoides,j; H, Heuchera

Note About Images