Vegetation structure and the regeneration of short-lived forbs in chalk grasslands in La végétation des pelouses calcaires.
in open sites. Apparently variation in the vegetation structure is necessary for the maintenance of short-lived forbs in chalk grassland. The productivity must not exceed 600-700 g.m yr, preferably less than 400 g.m yr. Finally, the proper management
Chemical analyses were performed on different types of ice sampled in the Forbe's ogives of the Tsijiore Nouve glacier (Swiss Alps). They add some lights to the theory of ogive formation. The contrast between dark and light bands which is obvious
Arqué (P.) ; Biobibliographie ; Biographie ; Cameina d'Almeida (P.) ; Cavaillès (H.) ; Charpentier (J. de) ; Christaller ; Drygalski (E. von) ; Forbes (J. D.) ; Formozov (A. N.) ; Ghum ; Goyder (G. W.) ; Géographes ; Histoire de la géographie
; Holmes (J. M.) ; Kropotkin (P. A.) ; Larcom (T. A.) ; Linton (D. L.) ; May (J. M.) ; Mushketov (I. V.) ; Oberhummer (E.) ; Penck (A.) ; Revert (E.) ; Richthofen (F. von) ; Siècle XIX-XX ; Solch (J.) ; Tamayo (J. L.) ; Teilhard de Chardin (P.) ; Vernadsky
(V. I.) ; Ward (R. D.) ; Wissler (C.)
Notices concernant 25 géographes: P. Camena d'Almeida (1865-1943), H. Cavaillès (1870-1951), P. Arqué (1887-1970), E. Revert (1895-1957), W. Christaller (1893-1969), J. de Charpentier (1786-1855), E. von Drygalski (1865-1949), J. D. Forbes (1809
-1868), A. N. Formozov (1899-1973), G. W. Goyder (1826-1898), J. M. Holmes (1896-1966), P. A. Kropotkin (1842-1921), T. A. Larcom (1801-1879), D. L. Linton (1906-1971), J. M. May (1896-1975), I. V. Mushketov (1850-1902), E. Oberhummer (1859-1944
), A. Penck (1858-1945), F. F. von Richthofen (1833-1905), J. Solch (1883-1951), J. L. Tamayo (1912-1978), P. Teilhard de Chardin (1881-1955), V. I. Vernadsky (1863-1945), R. D. Ward (1867-1931), C. Wissler (1870-1947).
or calcareous soils on dependence of the climate one can find various complexes of vegetation. They contain bushlike forests, shrubs, forb fringes and xerothermic grasslands. The position of these complexes in the landscape and the relation to zonal vegetation
are represented by many examples. Sociological, distributional and ecological conditions, structure and floristic combination of border forests and forb fringes are characterized.
Etude par simulation du transport et du dépôt d'argiles (D=0,045mm) en conditions d'équilibre: elles ont un comportement analogue au sable en variation avec la force du courant. Pour une hauteur d'eau de 0 à 10cm les ripple-marks sont stables