Nelumbo - The Bulletin of the Botanical Survey of India

J. S. Singh ¹, Krishna Mitra ²

Affiliations
1 Department of Botany, Banaras Hindu University, Varanasi-5, IN
2 Botanical Survey of India, Central Botanical Laboratory, Calcutta, IN

Abstract

This paper embodies the ecological observations made along the exposed riverbeds and the immediate banks of the rivers Jamuna and Ganga at Allahabad during thé months of April to June in 1962 and 1963.

The physical features, climate and soil of the area are discussed.

Botanical composition of the vegetation and the relative abundance, preference for habitat, types, and phenology of the important species are given.

The vegetation is characterised by the preponderance of annual plants and consists of the species of the wet meadow and dry meadow stages of Dudgeon (1920). The thorn scrub Stage is represented by Acacia arabica and Zizyphus jujuba.

Full Text

   

R. ¹, K. P. Singh ¹, J. S. Singh ²

Affiliations
1 Banaras Hindu University, Varanasi, IN
2 Kurukshetra University, Kurukshetra, IN

Abstract

Wide distribution of many Linnean species across climatic, edaphic and biotic barriers may be either due to a wide ecological amplitude of the species as such, or to the presence of a number of distinct local populations, well adapted to the respective ecoclimates. These populations may show continuous variation along an envirormental gradient (ecocline) or discontinuous variation (ecotypes). The morphological or physiological adaptive characters are genetically fixed. Although a number of genecological techniques have been developed in the recent past, to differentiate such ecologic populations, the provenance trial technique has gained much importance. In the present communication the technique as well as some important results obtained through its use, both within and outside India, have been briefly discussed.

Full Text

   

S. P. Jain ¹, J. S. Singh ²

Affiliations
1 Botany Department, Kurukshetra University, Kurukshetra, IN
2 Department of Botany, Kumaon University, Nainital, IN

Abstract

The present paper deals with the study of the Biological spectrum of the vegetation of North-East Haryana. A detailed study of different life-forms indicated that Nanophanero phytes (N) and Hemicryptophytes (Hc) are poorly represented. The study also indicates the presence of therochamaephytic (42%, 22%) flora. The dominance of therophytes might have partly resulted from disturbance in vegetation due to heavy grazing and exploitation of forests for extensive cultivation. A comparison of the biological spectrum of this area with those of other regions of India reveals that the climate is semi-arid.

Full Text