MODERN POLLEN RAIN IN RELATION T VEGETATION IN JAMMU, JAMMU AN KASHMIR, INDIA

摘要

We analyzed pollen spectra constructed after the pollen analysis of five moss pollsters, which have been collected from the open area in Jammu region to provide information on modern pollen rain in the area of investigation. The study shows the dominance of arboreals (APs) and relatively low values of non-arboreals (NAPs). Among the arboreals, Pinus (av. 6.47% pollen) is encountered in high values, corresponding its composition in the floristics. However, the other subtropical taxa and also the associates of Pinus, such as Juglans, Salix, Rosaceae, Moraceae, Sapotaceae, Emblica officinalis. Acacia, etc. contributed with less frequencies (<0.5%-l% pollen only) in the total pollen rain. The underrepresentation of these taxa could be attributed to poorpreservation of their pollen in the samples as well as low pollen dispersal efficiency. Besides, Trema politoria, Bombax ceiba, Ougeina ooienensis, Dalbergia sissoo. Cassia fistula, Albizia lebbeck, Ehretia aspera, Anogeissus latifolia, Flacourtia indica, Nyctanthes arbor-tritis, Lagerstroemia, Diospyros, Butea, Mitragyna, Lannea, Aegle marmelos, Ailanthus excelsa, etc. occurring in excellent amount in the forest remain untraceable in the samples probably due to their insect-pollinated nature and low pollen production. The microbial degradation of their pollen in the sediments cannot also be ruled out. Meanwhile, the encounter of temperate taxon,Picea with average values of 50.02% pollen in the samples could be due to the strong wind transportation from the higher elevations, possibly from both northern as well as southern aspects of Pir Panjal and from the Kashmir Valley. This is followed by Cedrus (av. 7.1%) and Alnus, Betula, Ulmus, Abies and Myrtaceae (<0.5-1% each) in the subtropical belt in lowto high frequencies, which could be accredited to wind transportation pattern in the study area.Grasses, Tubuliflorae, sedges, Cheno/Am, etc. are the major herbaceous elements and their presence in good numbers exhibit their actual presence in the forest floor. The record of Cerealia and other culture pollen taxa such as Cheno/ Am, Caryophyllaceae, Brassicaceae and Artemisia attests the proximity of cultivated land and human habitation to the study area. This comparative data base on the modern pollenrain/vegetation relationship will serve as modern analogue for the appropriate description of vegetation succession from the study area and coeval change in climate during the Late Quaternary Period.