Integrating geographical data and phenological characteristics derived from MODIS data for improving land cover mapping
Cartographie thématique ; Chine ; Chine du Nord-Est ; Couverture végétale ; Etude comparée ; Image satellite ; LANDSAT ; MODIS ; Phénologie ; Propriétés du sol ; Utilisation du sol
China ; Comparative study ; LANDSAT ; Land use ; North-Eastern China ; Phenology ; Plant cover ; Satellite imagery ; Soil properties ; Thematic mapping
The study developed a feasible method for large-area land cover mapping with combination of geographical data and phenological characteristics, taking Northeast China (NEC) as the study area. First, with the monthly average of precipitation
with phenological variables derived from the moderate resolution imaging spectroradiometer (MODIS) data (enhanced vegetation index (EVI) and land surface water index (LSWI)), which were taken as input variables of land cover classification. Decision Tree (DT
Forest phenological patterns of Northeast China inferred from MODIS data
China ; Forest ; North-Eastern China ; Phenology ; Remote sensing ; Spatial distribution ; Typology ; Vegetation index
This paper describes the application of Moderate Resolution Imaging Spectroradiometer (MODIS) time series data for forest phenological patterns. The forest phenological phase of Northeast China (NE China) and its spatial characteristics were
inferred using 1-km 10-day MODIS normalized difference vegetation index (NDVI) datasets of 2002. The threshold-based method was used to estimate 3 key forest phenological variables, which are the start of growing season (SOS), the end of growing season (EOS
) and growing season length (GSL). Then the spatial patterns of forest phenological variables of NE China were mapped and analyzed. Results indicate that forest phenological phase from MODIS data is comparable with the observed data.
Le dénombrement des grains de pollen recueillis par un capteur volumétrique est complété par une étude phénologique, qui permet de distinguer les périodes d'apport « transhumant » des périodes de dissémination essentiellement locale. - (JPB)
Phenology and pollination ecology of the desert plant Moricandia nitens (Brassicaceae) in the Negev, Israel
Arid area ; Atmospheric moisture ; Biogeography ; Desert ; Israel ; Negev ; Phenology ; Phytogeography ; Pollen ; Statistics ; Temperature
The phenology and pollination biology of the desert plant Moricandia nitens with long-tubed flowers was studied in Advat, Central Negev. Reproduction of M. nitens, being a self-incompatible and obligate outcrosser, is dependent on insects which
L'A. présente une méthode d'étude spatiale et temporelle des conséquences des variations régionales de l'environnement et du climat sur la dynamique saisonnière et annuelle de la végétation à l'aide des données phénologiques. - (D. Rouvière).
radiatives jouent un rôle au moins aussi important en été. La baisse des températures devient prépondérante en automne, en association avec le rythme et l'intensité des sécheresses qui ont marqué la période de végétation. Etude des années 1951 à 1989.―(JPB)
Adaptation ; Arid area ; Bioclimatology ; Heat ; Phenology ; Quantitative ecology ; Temperature ; Uzbekistan ; Vegetation
En 1989-1990, dans la zone de piedmont de l'Ouzbékistan étude de la résistance à la chaleur du système respiratoire de 5 espèces (2 graminées, 3 légumineuses). Dans les années sèches la valeur de la température critique de la respiration reste
A 20-year record from an eastern North American phenological network is used to demonstrate a regional scale approach to plant-climate interaction studies. Models incorporating first leaf emergence and surface weather data are described and tested
Biogeography ; Climate ; Climatic data ; Energy balance ; Oklahoma ; Phenology ; Spring ; United States of America ; Vegetation cycle
The AA. explore a new-phenology-based strategy for evaluating the spring surface energy-balance shift. Their technique can reflect native-species responses and atmospheric surface layer change at a variety of sites, using synoptic-scale first leaf
and first bloom phenology models. The AA. test the approach at 3 locations with diverse climates, and within a group of stations in the state of Oklahoma, which has moderate climate variations across an east-to-west gradient. The resuls show that the onset
of spring in midlatitudes is a modally abrupt (rather than gradual) seasonal transition in terms of energy balance and carbon-flux change that can be linked directly to vegetation phenology.
Three phenological categories of trees are distinguished : deciduous evergreen, and flexible. The latter trees tend to become deciduous under highly seasonal climates, and evergreen under slightly seasonal or aseasonal climates. The more flexible
the phenological pattern of a species in its country of origin, the easier for it to adapt to new climatic conditions.
Sur la méthode d'étude des géocomplexes de paysage inférieurs de la réserve naturelle de Visim à partir des données phénologiques
Ecosystem ; European part of Russia ; Geocomplex ; Geosystem ; Phenology ; Ural Mountains ; Vegetation
écoanomalies phénologiques moyennes, écarts de la date moyenne du passage par la situation phénologique déterminée de l'unité de calcul de chaque espèce de plante dans des secteurs concrets par rapport à la date moyenne de tous les faciès étudiés.
Bioclimatology ; China ; Climatic change ; Climatic hazard ; Climatic trend ; Frost ; North-Eastern China ; Northern China ; Phenology ; Spring (season) ; Temperate zone
Based on phenological data derived from the Chinese Phenological Observation Network (CPON), corresponding meteorological data from 12 study sites and phenological modeling, changes in flowering times of multiple woody plants and the frequency
the same period, the number of frost days in spring decreased and the last frost days advanced across the study area. Considering both flowering phenology and occurrence of frost, the frost risk index, which measures the percentage of species exposed