Cycle de l'eau ; Détermination au champ ; Ecologie ; Ecologie végétale ; Ecosystème ; Géographie physique ; Luzern ; Méthodologie ; Plante cultivée ; Teneur en eau de la plante ; Transfert hydrique ; Végétation
A previously presented model for water circulation within plants suggested a method for determining, from transpiration and water potential measurements, the amounts of water lost and recovered during the course of the day by the plant canopy
here include the root system contribution| for the lucerne canopy studied, this contribution corresponds to two third of the water lost by the plant. And in conclusion, the possibilities of increasing accuracy while simultaneously simplifying
Leaf temperatures in seven physiognomic groups of plant species and surface temperatures of bare soil were measured at four sites between 940 m and 2,040 m above sea level in the Snowy Mountains of South-Eastern Australia. Maximum leaf-air
temperature differences on clear midsummer days reached 7 C in trees, 13 C in shrubs, 21 C in dwarf shrubs, 24 C in rosette plants and grass tussocks, and 30 C in an isolated moss cushion. The largest leaf-air temperature differences in trees occurred
Biomasse ; Effet de rang ; Généralités sur la géographie ; Image satellite ; Landsat ; Modèle ; Plante cultivée ; Prévision ; Récolte ; Réflectance ; Télédétection ; Végétation
réflectance des plants par modulation de la densité de végétation à travers les rangs suit une procédure parallèle à celle d'une couverture uniforme. Les prévisions utilisant le modèle en rang pour le blé montrent que les effets de rang sont plus importants
dans le canal MSS 5 et peuvent entraîner une sous-estimation de la biomasse des plants.
This paper considers a model of cold and dry full-glacial climates for the southwestern United States in the light of published studies. The evidence from fossil plants is shown to be reconcilable with temperatures some 10C below their present
levels and a concomitant shift of the upper timberline which varied according to regional summer lapse rates. Fossils of thermophilous or mesophytic plants are cited by some writers as evidence for mild, pluvial conditions although today these plants
It is only recently, however, that sufficient information has been gathered on past and present plant distributions to allow anything more than speculative reconstructions of the origins and development of the flora and vegetation. It is suggested
. The status of plant communities is assessed in the light of this historical reconstruction.
The vegetative growth of Dactylis glomerata L. was measured under various controled environmental conditions. The evolution of the biomass of plant was analyzed both as a function of time and as a function of morphogenetic development. The main
features of these representations have been discussed, which led us to suggest a relationship between V the rate of appearance of leaves on the main shoot and M the biomass of plant, expressed by V M, where is a parameter less than one, and dependent
Assainissement du sol ; Besoin en eau des plantes ; Drainage ; Eau ; Eau du sol ; Géographie physique ; Hydromorphie ; Métrologie ; Régulation de l'eau du sol ; Sol ; Sol à gley ; Stagnogley ; Subsurface two-way water regulation ; Technique
A technique is presented which on appropriate stagnogley sites seems to be very promising for water regulation according to plant requirements. (H.L.).
(1951-1980) ; Agroclimatologie ; Agropédologie ; Climat ; Géographie physique ; Insolation ; Malaisie ; Plante cultivée ; Potentiel agricole ; Précipitation ; Radiation ; Régionalisation physique ; Sol ; Température ; Vent ; West Malaysia ; Zone
Compte tenu de la combinaison des différentes variables climatiques, pédologiques et topographiques, les besoins des seize principales plantes cultivées en Malaisie (cultures pérennes ou annuelles, de plaine ou de montagne) permettent une division
Engrais ; Enquête par questionnaire ; France ; Grande culture ; Géographie de l'Europe ; Plante cultivée ; Rendement agricole ; Surface cultivée ; Système de culture ; Terre arable ; Utilisation du sol
sur les plantes, si aucune perturbation ne vient s'y ajouter. D'autre part, elle a une action différente sur une même espèce végétale suivant la génération de l'année et le stade de développement des plantes.
Defining the spatial and temporal limits of vegetational processes such as migration and invasion of established communities is a prerequisite to evaluating the degree of stability in plant communities through the late Quaternary. The interpretation
of changes in boundaries of major vegetation types over the past 20,000 yr offers a complementary view to that provided by migration maps for particular plant taxa. North of approximately 43N in eastern North America, continual vegetational disequilibrium has
The location of sewage treatment plants on a continuous space: Theorical and empirical analyses in Including papers from the 2 nd Tsukuba conference on regional development and planning.
Etudes des principaux lacs du Cachemire sous leurs aspects physiques et humains: géologie, morphométrie, climat, conditions physiques et chimiques des eaux, plantes aquatiques (macrophytes). L'A. met en garde contre la pollution croissante des lacs
, spécialement par le déversement des eaux usées et égouts, préconise un contrôle de l'utilisation des rives et de la surface des eaux et l'élimination de l'excès de plantes aquatiques.
domestic reserves of high-grade bauxite. The Soviet planners adopted a policy of relying increasingly on imports of high-grade bauxite as well as alumina, the intermediate product. The construction of a seaboard alumina plant at Nikolayev to process Guinean
bauxite into alumina for use at the Sayanogorsk aluminum plant under construction in Siberia represents the latest development under that policy, which saw dependence on imported raw materials for aluminum production rise from 12 percent in 1965 to some 50
Plant biomass was measured in forest regrowth on fields abandoned after a cycle of raingrown rice following clearing and burning. Its evolution, with that of the main components (Macaranga hurifolia, lianas, Marantaceae, Zingiberaceae, miscellaneous
t/ha/year. The changes in biomass of the different components show the part played by each in the evolution of the plant cover reconstituting the forest. The results are compared with those from other tropical regions.