physique ; Instrumentation ; Manuel ; Microclimat ; Paillis ; Photosynthèse ; Productivité ; Productivité agricole ; Protection contre le gel ; Protection de l'environnement ; Radiation ; Régime thermique du sol ; Sol ; Technique agricole ; Température
modifications microclimatiques susceptibles d'améliorer la productivité des plantes (avec d'excellents développements sur les brise-vents et la protection contre les gelées). L'ultime chapitre évoque rapidement la biométéorologie humaine et animale. (JPB).
Etude des données bibliographiques pour 3 facteurs de productivité: réserves de phytomasse, masse morte et production annuelle pour tous les écosystèmes de Sibérie. Les données sont classées selon la division du territoire en zones thermiques et en
régions bioclimatiques. Le résultat de l'analyse c'est l'identification d'une limite hydrothermique déterminant les valeurs des paramètres de la productivité. Article traduit du russe, extrait de Počvovedenie, 1994, n° 12, pp. 51-56.
In the thermodynamic theory of aquatic ecosystems the non-linear relations between rates and affinities of biological processes, such as primary production, respiration, grazing etc. can be determined using an optimun principle. Especially
Geographical patterns in the biological productivity of soil-and-vegetation associations of Northern Eurasia
A partir des données collectées par l'A. dans une base de données concernant la productivité biologique d'associations sol-végétation zonales, montagnardes, intrazonales, on étudie la répartition géographique, en Eurasie du Nord, de la phytopasse
Use of satellite images in mapping of biological diversity in Senegal
The aim of the project is to develop a method for mapping and monitoring of biological diversity in the Sahel zone. Sahel is undergoing marked environmental changes, affecting not only human populations but also ecological communities. These ongoing
processes have biological implications on both national and international levels. The Sahelian biotopes hold a number of endemic biological assets and constitute the main wintering ground for a significant number of Palearctic migratory bird species.
The article deals with the results of the investigation of the biological productivity of the cotton agrophytocenoses under different doses of mineral fertilizers. The functioning of cotton has energetically been estimated under the same conditions
Palaeoecological evidence for environmental change during the last 200 years. I. Biological data
This paper reviews the role of biological data for assessing ecosystem change during the last 200 years, with examples from North America and Europe where most of this research, has to date, been concentrated.
A karszt biologiai produktum. (Karsts are biological products)
science has unambiguously demonstrated that most of the karst phenomena on the surface of the Earth reflect the effect of the activity of the biological world. (CK).
Charakteristik der chemischen und biologischen Ozeanologie der Ostsee. (Characterization of chemical and biological oceanology of the Baltic Sea)
the seasonal changes of the chemical and biological conditions in the surface layer, the long term changes of the chemical conditions in the stagnating deep water and long-term trends of chemical and biological processes in the Baltic Sea are discussed. (HL).
The role of biological weathering in periglacial areas : a study of weathering rinds in south Iceland
Experiments using fungi strains isolated from basaltic boulders allow one to decipher biological weathering. A historical approach using heterochronous moraines provides the opportunity to follow the life of weathering rinds and helps to build
Endolithic lichens, rapid biological weathering and Schmidt hammer R-values on recently exposed rock surfaces : Storbreen glacier foreland, Jotunheimen, Norway
The aim of this paper is to investigate the rate of biological weathering in the earlier stages, on more recently exposed surfaces, including moraine ridges that were deposited by the glacier in the 1980s and 1990s. This study demonstrates
the reduction in Schmidt hammer R-values that followed the rapid colonization by this endolithic lichen of pyroxene-granulite boulders on terrain deglaciated over the last 88 years on the Storbreen glacier foreland, Jotunheimen. The rapid rate of biological