Analyse des groupes ; Analyse en composantes principales ; Bassin-versant ; Chine ; Formation herbacée ; Forêt ; Luonan ; Palynologie ; Pollen ; Shaanxi ; Typologie ; Végétation
Análisis de grupos ; Análisis en componentes principales ; Bosque ; Chensi ; China ; Cuenca hidrográfica ; Formación herbácea ; Palinología ; Polen ; Tipología ; Vegetación
that the surface pollen assemblages reflect the vegetation quite well. Cluster analysis and principal components analysis of pollen assemblages can distinguish forest and non-forest vegetation well. The former method is better at separating pine and mixed forests
In the catchment of South Luohe River, in the transitional zone between south and north China, 40 surface samples under 10 vegetation types were collected to reveal the relationship between pollen assemblages and vegetation. The results show
Pollenanalysis and Quaternary research in Scotland
Methodological advances are considered in the context of research in Scotland. The applications of pollenanalysis in specific areas of Scottish Quaternary research are discussed. These include the reconstruction of interglacial, interstadial
The aim of this study is to compare the modern Amazon River pollen discharge and terrestrial fossil pollen records with high-resolution fossil pollen and stable isotope records from the Amazon Fan so as to reconstruct the vegetation of the Amazon
Pollen assemblages of cultivated vegetation in central and southern Hebei Province
China ; Cultivated land ; Deforestation ; Grassland ; Hebei ; Human impact ; Mountain ; Palaeo-environment ; Palynology ; Plain ; Pollenanalysis ; Pollen diagram ; Scrub
Based on surface pollenanalysis and vegetation investigations from mountain and plain areas, this study shows the pollen assemblages from artifical vegetations and human disturbed vegetations in central and southern Hebei Province, China, and tries
to find the pollen types and pollen assemblages which can provide indications to the human activities, in order to give modern process evidences for studying the characteristics of regional vegetation and extracting human activity information in fossil
The Abric Romaní continental pollen record provides evidence of abrupt climate variations during the last glaciation. The pollen record reveals a pattern of high-frequency variations similar to that in ice cores as shown by oxygen isotopes or dust
This contribution explores some of the advances in the principles of fossil pollenanalysis and examines the application of palynology to outstanding questions concerning population and community ecology, and paleoclimatology reported mainly since
Pollenanalysis of the 1973 ice core from Devon Island glacier, Canada
The late Holocene and interglacial assemblages were dominated by Alnus, whereas the early Holocene and Wisconsinan ones were dominated by Betula and Artemisia. During the Holocene and probably the last interglaciation, most of the pollen and spores
and arctic air were more widespread and pollen sources were more distant| thus, at this time relatively little pollen was incorporated into the ice. The Devon ice-core data suggest that there should have been pollen in the continental ice sheet of Wisconsin
time. When the ice sheet retreated this pollen would be carried by meltwater and redeposited with silt and clay together with contemporary pollen, producing an ecologically anomalous assemblage.
C 14 dating ; Forest ; Human impact ; Palaeo-environment ; Palynology ; Pollenanalysis ; Quaternary ; Stratigraphy ; Swamp ; Uganda ; Vegetation dynamics
Deposits beneath Mubwindi Swamp provide a partial record of vegetation history since at least 43,000 yr ago. The AA. studied pollen from 2 cores and obtained 9 radiocarbon ages from 1 of these cores and 3 radiocarbon ages from the other. Pollen
deposited before and soon after the last glacial maximum represents vegetation very different from the modern vegetation of the Mubwindi Swamp catchment. The pollen data provide evidence for a late glacial montane forest refuge near Mubwindi Swamp. During
the past 2500 yr, a combination of climatic and human-induced changes in vegetation can be seen in the pollen records.
Pollen and macrofossils from Wisconsinan interstadial sediments in Northeastern Georgia
C14 dating ; Climatic variation ; Georgia ; Palaeo-ecology ; Palaeo-environment ; Palynology ; Pollenanalysis ; Quaternary ; United States ; Vegetation ; Wisconsinan
This paper presents results of pollen, plant macrofossil, and dating studies (TAMS and conventional) from a new site in the Piedmont region of northeastern Georgia. This study contributes information on vegetation of the region between 26,000
and 22,000 yr B.P., and provides a basis for reescamining interpretations from other southeastern sites. The AA. also use their data to address key problems of Pinus species identification from pollen and macrofossils and age-model uncertainties resulting
Integrating stalagmite, vertebrate, and pollen sequences to investigate Holocene vegetation and climate change in the Southern Midwestern United States
Biostratigraphy ; Cave ; Climatic variation ; Deciduous forest ; Holocene ; Isotope analysis ; Midwest ; Palaeo-environment ; Palaeoclimate ; Palynology ; Pollenanalysis ; Steppe ; United States of America
Speleothem carbon and oxygen isotopic records from Onondaga Cave, south-central Missouri, and Beckham Creek Cave, north-central Arkansas, are compared with the Cupola Pond and Oldfield Swamp pollen series from southeastern Missouri and the Rodgers
Major Holocene monsoon changes in continental southeast Asia are reconstructed from analysis of C 14 dated changes in pollen and organic/inorganic carbon in sediment cores taken from permanent, closed-basin, volcanic lakes in Ratanakiri Province
, northeastern Cambodia. Analysis focuses on the nature and timing of monsoon changes, inferred from changes in vegetation and lake conditions. This record is also significant for representing a lowland tropical forest setting in Asia.
The response of aboriginal practices to population levels and El Niño-Southern Oscillation events during the mid- to late-Holocene : a case study from the Sydney Basin using charcoal and pollenanalysis
Aborigines ; Australia ; C 14 dating ; Charcoal ; Fire ; Holocene ; Human impact ; New South Wales ; Palaeo-environment ; Palynology ; Pollen diagram
Pollen and macroscopic charcoal have been analysed from a sedimentary sequence representing approximately 6100 years from a site within Wollemi National Park, a part of the Greater Blue Mountains World Heritage Area. The aim was to examine
Pollen evidence of Late Holocene treeline fluctuation from the southern coast mountains, British Columbia
British Columbia ; Canada ; Climatic variation ; Holocene ; Mountain ; Palaeobiogeography ; Palaeogeography ; Palynology ; Pine ; Pollenanalysis ; Tree line
Alaska ; Bay ; Bristol ; C 14 dating ; Climatic variation ; Palaeo-environment ; Palynology ; Pollen diagram ; Postglacial ; Quaternary
Pollenanalysis of sediment cores from Grandfather and Ongivinuk Lakes reveals a record of postglacial vegetation and climate change in the northern Bristol Bay region. The chronology is based on six conventional 14C dates of bulk organic matter
from the Grandfather core. The unique features of these pollen records emphasize the spatial complexity of late Quaternary vegetation and climate history in eastern Beringia.
Pollenanalysis of a new core from Joe Lake indicates that the late Quaternary vegetation of northwestern Alaska was characterized by four tundra and two forest-tundra types. These vegetation types were differentiated by combining quantitative
comparisons of fossil and modern pollen assemblages with traditional, qualitative approaches for inferring past vegetation, such as the use of indicator species.
Aeolian transport ; Arctic Region ; Conifer ; North Pole ; Pollenanalysis ; Snow
Des analyses de pollen de deux échantillons de la couche supérieure de neige montre la présence d'une grande quantité de conifères (sapin, pin) et de décidus (bouleau, aune, orme, chêne), de plantes ligneuses et de buissons. Ceci atteste du
transport possible sur des milliers de kilomètres de pollens par des vents de sud.