During the last decade Quaternary pollen analysis has developed towards improved pollen-taxonomical precision, automated pollen identification and more rigorous definition of pollen assemblages zones. There have been significant efforts to model
the spatial representation of pollen records in terms of past vegetation patterns. The AA. review the difficulties in matching modelled post-glacial plant migration patterns with pollen-based palaeorecords and discuss the potential of DNA analysis of pollen
Prospects for Quaternary pollen research in China.
Development in pollen research is needed in three directions. Firstly, mastery of vegetational knowledge, identification of regularities of pollen dispersal in various geographical conditions| secondly, improvement in techniques of pollen analysis
, using the absolute pollen concept to rationalise zonation work, and in numerical techniques| thirdly, in application recognise the benefit of infiltration and coordination with related sciences. (TNC).
Spatial patterns of atmospheric pollen transport in a montane region
Annual pollen deposition was sampled for 6 yr in the southern Sierra Nevada, the Owens Valley, and the Inyo Mountains of central California. The step function that seems to characterize pollen distribution patterns implies that pollen from distant
population may be of little value in interpreting vegetation stability and change reflected by fossil pollen stratigraphy. The physical isolation of pollen embedded in the local mountain-valley wind system from that in the prevailing westerlies may explain
Bogs and lacustrine deposits are the best traps for pollens. But the identification at the level species is impossible and the pollen spectrum is never the exact reflect of the contemporaneous vegetation.
Pollen analysis of 23 surface samples in the east of Qaidam Basin reveals the characteristics of pollen assemblages and their relationships with vegetation and climate. Depending on the aridity, the vegetation communities are divided into 4 groups
Pollen representation, source area, and basin size: toward a unified theory of pollen analysis
The concepts of pollen source area and of production and dispersal biases in pollen representation are quantified by means of a simple theoretical model. Source areas and relative pollen representation are shown to depend on basin size according
to functions that describe the amount of pollen remaining airborne at increasing distances from single pollen sources. The integrated form of Sutton's equation for particle dispersal from a ground-level source gives usefull approximations applicable to pollen
La fluctuation des fréquences des pollen dans les dépôts alluviaux est liée à la sédimentologie et ne reflète pas la végétation locale ou régionale de l'époque du dépôt des sédiments. Les pollen alluviaux ne peuvent pas être utilisés pour la
Contemporary pollen spectra and vegetation of the Nyika Plateau, Malawi
A study of contemporary pollen rain on the Nyika Plateau reveals that both pollen hap and surface spectra reflect the present day vegetation pattern very closely. Fossil pollen spectra can be expected to give a good indication of regional changes
Comparison of the sequence of pollen associations of soil profiles with pollen zones of reference diagrams offers palyno-ecological information, relevant for reconstruction of landscape ecological development. Interpretation of soil pollen
associations requires knowledge of the processes of infiltration and conservation of pollen grains in the soil material. Micromorphology is an important technique to investigate these processes. This is demonstrated in a case study of polycyclic slope deposits
This paper focuses on air-borne sporo-pollen content and its variations throughout 1979, and discusses spore content of certain microorganisms and its variations. The amount of air-borne plant pollen and bacterial spores is much higher in hot sunny
L'air renferme très peu de pollen par temps pluvieux, ainsi qu'en présence de fortes amplitudes journalières de l'humidité relative, de calmes atmosphériques et de gel. A l'inverse, un temps chaud et ensoleillé, des vents de 2 à 5 m/s et une
amplitude journalière de l'humidité relative comprise entre 30 et 50% sont propices à de fortes concentrations de pollen. - (JPB)
Modern alluvial pollen varies with geomorphic setting and depositional facies in sediments of the Yellow, Hutuo, and Luan rivers and in Baiyangdian and Hengshuihu lakes. Alluvium dominated by Pinus pollen and Selaginella spores was deposited during
a flood. In reconstructing the ancient vegetation and past climate based on pollen in alluvium, it is important to consider sedimentary facies and geomorphologic setting.
A Late-Quaternary pollen record from Ka'au Crater, O'ahu, Hawai'i
C 14 dating ; Hawaii ; Lateglacial ; Palaeoclimate ; Palynology ; Pollen diagram ; Quaternary ; Tropical zone
A pollen record from Ka'au Crater, O'ahu, Hawai'i contains evidence for changes in vegetation and climate since about 28,000 C 14 yr B.P.. Climate reconstruction was based on modern climatic ranges of flowering plants and an index derived from
abundance of pollen in surface samples. The pollen-derived temperature index yields an estimate of 3°-5°C temperature depression during the last glacial maximum.
Pollen evidence from Lake Shayema, Mianning County, was obtained to examine postglacial vegetation and climatic change in southwestern Sichuan. The pollen record displays several changes in the vegetation over the last 11 000 yr. Except
for increased disturbance starting ca. 1 000 yr B.P., the predominance of sclerophyllous vegetation continued until today. The pollen results are compatible with proposed global circulation hypotheses of a strengthened monsoon system during the early to mid
A model of pollen source area for an entire lake surface
This paper describes a model for pollen deposition integrated over an entire lake surface, and it estimates the source area of major pollen types for various lake sizes. It is a modification of Prentice's (1985, 1988) model, which estimates
the source area of pollen deposited at a point in the center of a sedimentary basin. Comparison of the results from the two models displays the potential differences in pollen source areas when a bog and a lake of similar size are considered.
Etude de la relation pollen-végétation dans les montagnes du Qilian situées dans la zone de transition du Plateau du Tibet, du Plateau de Loess et de la région aride de la Chine du Nord-Ouest qui est l'une des zones clés du changement global de
Pollen analysis of snow samples from the North Pole region
Analyse pollinique ; Arctique ; Circulation atmosphérique ; Glace de mer ; Neige ; Pollen ; Russie ; Russie du Nord
Arctic Region ; Atmospheric circulation ; Northern Russia ; Pollen ; Pollen analysis ; Russia ; Sea ice ; Snow
Analyse pollinique d'échantillons de neige de glace de mer collectés en avril-mai 2002 par les membres de la Station Polaire de Russie du Nord-2001. En déterminant les espèces de plantes représentées par ces pollens et spores, on peut obtenir des
Comparison of air-borne pollen at Louvain-la-Neuve (Belgium) and Basel (Switzerland) during 1979 and 1980
The pollen production for both years was three times higher in Basel than at Louvain-la-Neuve. The interpretation of the pollen calendars showed an average onset of eight days earlier in 1979 and five days earlier in 1980 for the taxa in Basel
. The pollen catch for both stations was greater in 1980 than in 1979, which was characterized by an average delay in the onset of pollen shedding both in Basel and at Louvain-la-Neuve. (Les AA.).
Here, the AA. present the first modern pollen-rain data for tall terra firme moist evergreen Amazon forest, collected between 1999 and 2001 from artificial pollen traps in Noel Kempff Mercado National Park (NE Bolivia). Spearman's rank correlations
were performed to assess the extent of spatial and inter-annual variability in the pollen rain, whilst statistically distinctive data were identified using Principal Components Analysis (PCA). Comparisons which the floristic and basal area data
of the plot enabled the degree to which taxa are over/under-represented in the pollen rain to be assessed.
LEAD-210 AND POLLEN GEOCHRONOLOGIES ON LAKE SUPERIOR SEDIMENTS
LES VITESSES DE SEDIMENTATION, DANS DEUX DEPOTS DU LAC SUPERIEUR ONT ETE DETERMINEES PAR L'ETUDE DU POLLEN DE JACOBEE ET LA GEOCHRONOLOGIE AU PB. L'APPARITION DU POLLEN DE JACOBEE EST LIEE A L'ETABLISSEMENT HUMAIN ET SE SITUE AUX ALENTOURS DE 1830.