Nelumbo - The Bulletin of the Botanical Survey of India

K. R. Aggarwal ¹, A. K. Mukherjee ¹

Affiliations
1 Ecology Section, Botanical Survey of India, Calcutta, IN

Abstract

Analyses of pH, total dissolved solids, CO,, HCO₃, Cl, SO₄, Ca, Mg, Na and K are presented for water samples from dune slacks in Rameswaram Island. Comparison of these analyses has been attempted with well waters from the area, sea water and world average fresh water. It is inferred that these slacks are under the influence of sea water but ion-exchange process similar to those in arid alkali soils appear to be responsible for Ca/HCO₃ ratios of less than unity and Na/Cl and Mg/Cl ratios greater than those in sea water. Exceptionally high Na₂Co₃ and NaHCO₃, contents in one of the slack waters is explained on the basis of sulphate reduction due to favourable conditions developed locally there.

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T. Ananda Rao ¹, K. R. Aggarwal ¹, A. K. Mukherjee ¹

Affiliations
1 Ecology Section, Botanical Survey of India, Calcutta, IN

Abstract

The account presents the plant ecology with a description of soils and other related features of the Krusadi group of islands situated in the Gulf of Manaar approximately between 9°14'-9°15'N and 79°10.5'-79°14.5' E. Data on pH, organic matter contents, total soluble salts, sodium chloride contents and calcium carbonate contents in the soils of different habitats are presented in tabular form and an attempt made to correlate vegetation with the soil features. A classification of vegetation situations rather than strictly vegetation type has been brought out and comparison made with the main neighbouring island of Rameswaram with similar climate. The paper includes a vegetation map of the area prepared during the field work.

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T. A. Rao ¹, K. R. Aggarwal ¹

Affiliations
1 Botanical Survey of India, Calcutta, IN

Abstract

The plant ecology Beyt island, a narrow crooked strip of sand rock to the east of Okhamandal point and about 3 km to the north of the mainland of Okhamandal situated 22°35' : 72°21' in the Gulf of Cutch is presented in this paper. Based on the types of situations and edaphic features the vegetation of the island has been distinguished into 3 main categories : (1) Strand, (2) Salt pans, slacks and mud formations and (3) Inland mixed scrub forest. Main features of thewvegetation and analysis of soils are described under the'above mentioned heads. The flora is a mixture of coastal and inland types. Further, the affinity of the flora with the adjacent lands of Cutch and Okhamandal to Diu coastal area has been studied. A list of the plants occurring in the island is enumerated.

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T. Anand Rao ¹, K. R. Aggarwal ¹, A. K. Mukherjee ¹

Affiliations
1 Botanical Survey of India, Calcutta, IN

Abstract

The Plant ecology of Piram, a small narrow off shore island situated 21°36':72°21' in the Gulf of Cambay is presented in this paper. Based on habitat, substratum and edaphic features the plant communities of the island have been distinguished into 7 main categories under three vegetational zones. 74 species are enumerated and the flora resembles the one on mainland. The first ecologically annotated list of Vascular plants will form a background for a study of future changes.

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T. A. Rao ¹, K. R. Aggarwal ¹

Affiliations
1 Botanical Survey of India, Calcutta, IN

Abstract

The plant ecology of Diu, an island of irregular outline, situated in 20°43' N & 71°02' E and separated from the southern extremity of the peninsula of Saurashtra by a narrow channel on western shore of India is presented in this paper. Several plant communities are grouped into three ecosystems : Rock-strand, Strand and Inland sandy plain. The community type is a sub-division of an ecosystem, that is, it is recognised by the features of both its plant cover and its habitat. Plant communities under each of the three abovementioned ecosystems are described and also analysis of rocks and soils presented in tabular form to study soil features in relation to vegetation.

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