Tree invasion in meadows of Lassen Volcanic National Park, California
L'A. démontre qu'au Parc National du mont Lassen, en Califonie, la forêt envahit les anciennes zones de prairies, particulièrement de 1905 à 1955. Il analyse les facteurs naturels et humains. (M. Villey).
Structural variation and dynamics of lodgepole pine forests in Lassen Volcanic National Park, California
Diameter structure, age/diameter regressions, and stem dispersion patterns reveal spatial variability in lodgepole pine forest structure and dynamics in Lassen Volcanic National Park (LVNP). Spatial variability in this early successional species
Conservation of soil moisture by different stone covers on alpine talus slopes (Lassen, California)
This study reports on the influence of stone covers with different clast sizes on the soil moisture of alpine talus slopes in Lassen. Fifteen four-plot sets were sampled in the dry season (July 1990) in sandy areas and in talus covered with pebbles
This paper presents the main features of an altitudinal sequence. They were determined from mapping soils on a late cenozoic volcanic plateau west-southwest of Lassen Peak, and from the analyses of 27 pedons sampled from 270 to 2 030 m above sea
(C. Lassen). 4. L'importance des voyages d'affaires pour les regroupements industriels : faire du sens avec les travailleurs nomades (J. Wickham, A. Vecchi).
The age of the Rockland tephra, which includes an ash-flow tuff south and west of Lassen Peak in northern California and a widespread ash-fall deposit that produced a distinct stratigraphic marker in western North America, is constrained to 565,000