POLLEN TRAP STATIONS: MODERN ANNUAL DEPOSITION AND AERIAL POLLEN TRANSPORT IN THE LENA RIVER DELTA
Savelieva, Larissa A. 1Geographical Research Institute of St. Petersburg State University.
Dorozhkina, Marina V. State Research Center of Russian Federation Arctic and Antarctic Research Institute.
PAVLOVA, ELENA YU. State Research Center of Russian Federation Arctic and Antarctic Research Institute.
Studies of the annual pollen and spore deposition in different areas of the Lena River delta were undertaken for the first time in the Asian sector of the Arctic during the Russian-German “Lena-98” and “Lena-99” expeditions in the framework of the International “Laptev Sea System-2000” Project. To achieve this objective, three spore-pollen traps were set up along the meridional delta profile in accordance with the European Pollen Monitoring Programme for the period July 1998 to August 1999 (Pavlova & Dorozhkina 1999, 2000). A comparison between the results of spore-pollen analysis of the contents of traps and the surrounding vegetation was performed.
The results of the executed study have confirmed the conclusion that the current spore-pollen spectra are comprised both of pollen and spores of the local plants and of long-distance pollen and spores (Kalugina 1979).
The pollen of tree plants within the Lena River delta is long-distance and does not reflect the character of the local vegetation. The pollen influx of tree species depend on the wind regime character of the territory, location of the northern boundary of the tree species development areas and the morphological pollen structural features.
The dependence of the long-distance pollen deposition on the character of the wind regime of the region was established.
The character of the wind regime accounts primarily for the decreasing concentration of the tree plant pollen from south to north of the delta. The prevailing southerly and southeasterly wind direction determines the main pollen influx of tree species from the areas of their growth south of the delta. The pollen of shrubs in the traps is both long-distance and local.
The detected pollen corresponds to a great extent to the character of local vegetation in general. However, the deposited pollen concentrations do not reflect quite accurately the composition of dominating species.
For the long-distance shrub pollen, the dependence on the wind regime is also established.
The pollen of herbaceous plants is local reflecting to the greatest extent the character of the local vegetation cover.
The distribution of the deposited pollen assemblages among the different families of herbs corresponds to the plants dominating in plant communities of the study areas.
The features of the morphological structure and fossilization of pollen and the features of the productive capability and plant growing conditions are of large significance in the pollen transfer and deposition.
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