THE SIGNIFICANCE OF ZONAL, REGIONAL AND LOCAL VEGETATION ELEMENTS IN LACUSTRINE POLLEN SPECTRA

被引：3

作者：

KHOMUTOVA, VI

机构：

[1] Institute of Limnology, Russian Academy of Sciences, St. Petersburg

来源：

GRANA | 1995年 / 34卷 / 04期

关键词：

D O I：

10.1080/00173139509429053

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Present day lakes of all sizes, are ''collectors'' of pollen and spores from the vegetation cover of their watershed area. The pollen assemblages of their bottom sediments are 95% due to the effect of winds. In spite of a great variation in limnic characteristics, the decisive factor determining the composition of the subrecent spectra of the largest lakes is their enormous dimensions (Ladoga, Onega, Vozhe, Lacha, Kubenskoye, Ilmen and others) and their location within a single vegetation zone - middle and south taiga. The spectra of these lakes gives a highly averaged and floristically poor description of the vegetation at the highest taxonomic level - subzonal and formation-group. Pollen of the zonal vegetation - pine and spruce - predominates in the sediments. The smaller the water body (lakes of various types in the Karelian Isthmus and on the East Latvian Plateau), the greater is the influence of the surrounding vegetation cover (regional factor) on the pollen spectra. In small water bodies the regional and local elements of the vegetation cover are of great importance - birch, alder, willow and herbs belong to this group. The pollen of plants growing in the lake scarcely plays any part in those lakes investigated, despite their being strongly overgrown. This is due both to the exceedingly low pollen productivity of lake plants in comparison with that of terrestrial plants and to the destruction of pollen grains under the prevailing hydrodynamic and hydrochemical conditions, because their pollen have thin exines.

引用

页码：246 / 250

页数：5

共 21 条

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