The Earth as Modified by Human ActionMarsh, George P. (George Perkins)
History
The Earth as Modified by Human Action
Marsh, George P. (George Perkins)
Conservation of natural resources; Human geography; Nature -- Effect of human beings on; Physical geography
The rural population, which in France is generally hostile to all forest
laws, soon acquiesced in the adoption of this system, and its success
has far surpassed all expectation. At the end of the year 1868 about
190,000 acres had been planted with trees, [Footnote: Travellers
spending the winter at Nice may have a good opportunity of studying the
methods of forming and conducting the rewooding of mountain slopes,
under the most unfavorable conditions, by visiting Mont Boron, in the
immediate vicinity of that city, and other coast plantations in that
province, where great difficulties have been completely overcome by the
skill and perseverance of French foresters. See Les Forets des Maures,
Revue des Eaux et Forets, January, 1869.] and nearly 7,000 acres well
turfed over in the Department of the Hautes Alpes. Many hundred ravines,
several of which had been the channels of formidable torrents, had been
secured by barriers, grading and planting, and according to official
reports the aspect of the mountains in the Department, wherever these
methods were employed, had rapidly changed. The soil had acquired such
stability that the violent rains of 1868, so destructive elsewhere,
produced no damage in the districts which had been subjected to these
operations, and numerous growing torrents which threatened irreparable
mischief had been completely extinguished, or at least rendered
altogether harmless. [Footnote: For ample details of processes and
results, see the second volume of Surrell, Etudes sur les Torrents,
Paris, 1872, and a Report by De La Grye, in the Revue des Eaux et Forets
for January, 1869.]
Besides the processes directed by the Government of France, various
subsidiary measures of an easily and economically practicable character
have been suggested. Among them is one which has long been favorably
known in our Southern States under the name of circling, and the
adoption of which in hilly regions in other States is to be strongly
recommended.
It is simply a method of preventing the wash of surface by rains, and at
the same time of providing a substitute for irrigation of steep
pasture-grounds, consisting in little more than in running horizontal
furrows along the hillsides, thus converting the scarp of the hills into
a succession of small terraces which, when once turfed over, are very
permanent. Experience is said to have demonstrated that this simple
process at least partially checks the too rapid flow of surface-water
into the valleys, and, consequently, in a great measure obviates one of
the most prominent causes of inundations, and that it suffices to retain
the water of rains, of snows, and of small springs, long enough for the
irrigation of the soil, thus increasing its product of herbage in a
fivefold proportion. [Footnote: Troy, Etude sur le Reboisement des
Montagnes, sections 6, 7, 21.]
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