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Ashok Kumar , Beena Tripathi , G. Singh

Abstract

Study on vegetation diversity in degraded hills of Bar conglomerate formation in Pali district of Rajasthan reveals the occurrence of 10 trees, 7 shrubs and 4 undershrubs/herbs with an average population of 16.9 tree, 116.8 shrubs and 4.8 herbs per plot. P. juliflora showed the highest population followed by Z. mauritiana. Frequency of occurrence, density and abundance were also highest for the P. juliflora. Species richness was the highest for tree and lowest for the shrubs, but Shanon-Weiner index was highest for shrubs. Population of shrubs was relatively more even as compared to the tree or undershrub/herb species. Importance value index was highest for P. juliflora among tree and Euphorbia caducifolia among the shrubs indicating a change of forest types from Tropical Euphorbia Scrub to Tropical Prosopis juliflora scrub.

Keywords

Degraded Hills, Vegetation Diversity, Importance Value Index, Vegetation Status

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Ashok Kumar , G. Singh , Beena Tripathi

Abstract

Rock types, soil profile and nutrient status and the vegetation study was carried out in degraded area of Aravalli selecting five villages along the hill in a stretch of about 40 km. Calc amphibolite gneiss, quartzitic schist, granitic gneiss, calc schist, garnetiferous mica schist, bar conglomerate schist and pegmatite were the dominant rock types in the area. Under the process of weathering these rocks provided sandy to sandy loam soils. The rainfall and wind facilitated erosion and the soil transported and deposited in the pediment area resulted in an increased soil depth. Desertification also occurred at some places. Degradation pattern shows less availability of vegetation cover and needs to rehabilitate these hills. In deeper soil layers, increased soil pH was associated with sensitive sandy soils which might be responsible for basic characters of these soils. The soil content and depth increased with different rocks VIZ: calc amphibolites gneiss

Keywords

Degraded Hills, Rock Types, Soil-vegetation Relation, Soil Structure, Soil Nutrient

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Beena Tripathi ¹, G. Singh ²

Affiliations
1 Department of Geology, Jai Narain Vyas University, Jodhpur-34200, IN
2 Arid Forest Research Institute, New Pali Road, Jodhpur (Rajasthan) -342005, IN

Abstract

The paper deals the study a metasedimentary sequence, overlying schistose formation of Sendra Formation of Delhi Supergroup and the underlying Banded Gneissic Complex of Pre-Delhi age, in Birantiya Khurd -Raira Khurd areas in northwestern Rajasthan. The sequence is important due to its heterogenous lithologic association. It shows by different type of conglomerates imbedded in quartzofeldspathic schist. The process of soil formation by breaking up the rock particles and organic matter from weathering and erosion of subterranean parts are influenced by different biological activity. This sequence has been defined as the 'Bar conglomerate horizon' in this paper. The soils derived from the parent rocks which sustain different vegetation, depends upon the climatic conditions. Hence, the nutritional status is required to be studied from the point of view of sustenance of flora in the area. There is no clarity, so far, regarding the exact chronology of deformation in the area. At the same time, the lithostratigraphic history of the area also needs a further revision. In view of the above, the Bar-Mohra Khurd-Raira Khurd area have been studied extensively and results are presented in this paper.

Keywords

Lithostratigraphy, Delhi Supergroup, Bar Conglomerate Horizon.

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