MODERN POLLEN RAIN-VEGETATION RELATIONSHIP STUDY IN JALESAR, UNNAO DISTRICT, UTTAR PRADESH

摘要

The paper deals with the modern pollen rain/vegetation relationship, based on the pollen analysis of 5 surface samples gathered from Jalesar Lake, Unnao District (U.P.). Tne pollen assemblages reveal the dominance of non-arboreals and relatively low frequencies of arboreals trees & shrubs). Among the tree taxa, Acacia (av.6.35%) and Madhuca indica (av. 4%) are the principal components and they are consistently represented with av. 9.35% pollen, whereas rest of the trees viz., Capparis, Holoptelea, Bauhinia, Ailanthus, Shorea robusta, Schleichera, Syzygium and members of Meliaceae which occur commonly are recovered very scantily. The under-representation of all these taxa could be inferred to their low pollen production owing entomophilous mode of pollination. The poor preservation of their pollen in the sediments can not be ruled out. On the whole, the tree taxa constitute av.17% fraction of the total pollen rain. The representation of grasses, sedges, Cheno/Am, Caryophyllaceae, Brassicaceae, Asteraceae, etc. in the pollen spectra substantiates their actual composition in the ground flora. The frequent encounter of Cerealia along with other culture pollen taxa viz., Cheno/Am, Brassicaceae, Artemisia and Cannabis sativa reflects the proximity of cultivated land and human habitation.