Sunil Puri , S. L. Swamy

Abstract

Growth and nutrient use efficiency were determined for Neem (Azadirachta indica A.Juss) seedlings grown at various levels of light, nitrogen and phosphorus. Seedlings were given light (diffused and complete) and nutrient (N and P) treatments comprising of either high N.high P, high N-low P, low N-high P, or low N-low P. Seedlings grown in complete light (800μ mol/m²/s) had four times more biomass than those grown in diffused light (200μ mol/m²/s). Significant increase in seedling biomass was evident due to nitrogen application while phosphorus had no effect on biomass. Leaves contributed maximum biomass, followed by ischolar_mains and stem. Nutrient use efficiency studies revealed that it decreased with an increase in supply of nutrients. The results of this study suggest that neem seedlings can adjust their nutrient use efficiency and can grow even under limited available resources. It is also inferred that the species can tolerate soil resource depletion caused by competitor species.

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Sunil Puri , S. L. Swamy , A. K. Jaiswal

Abstract

The study describes growth, biomass and net primary productivity in different clones of Populus deltoides Bartr. Grown on vertisol type of soil at Raipur situated at 21°12'N latitude and 81°36°E longitude. Based on growth and survival performance of 106 clones in the nursery over successive two years, 19 clones were selected for field evaluation. Survival in the field in different clones ranged from 40 to 100 per cent. The best five clones in 4 yr old plantation was in order of 65/27 > S7Cl > G48 > G3 > D121. The above- ground biomass varied from 2.79 to 43.77 MT ha^-1, while that of coarse ischolar_mains it was 0.67 to 10.5 Mg ha^-1. Stem wood in different clones varied from 33.7 to 62.2 per cent of the total biomass followed by coarse ischolar_mains (16.5-28.0%), branches (7.4-23.7%), bark (7.5-12.9%) and leaves (5.3-10.3%). Net primary productivity also differed in different clones. The study concludes that some of the clones can be grown at 21°N latitude which was to date not considered a suitable region for the introduction of P. deltoides.

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Arvind Bijalwan , S. L. Swamy , C. M. Sharma , Rajiv Umrao , Harsh Bodh Paliwal

Abstract

Structure composition and diversity of woody vegetation of sal mixed dry tropical forest of hmalamdi watershed in barnawapara sancuary, Raipur district of Chhattisgarh, India was studied in over and uner storey forest in four different aspects, Nine prominent tree species were recorded in over and under storied forest with the predominance of Shorea robusta in all the aspects. In the overstorey(pooled), relative density values ranged from 3.03 to 43.94 and understorey from 0.04 to 42.71, Shorea robusta recorded highest relative density in over and understorey vegetation followed by Madhura indica and Tectona grandis The IVI values ranged from 15.88 to 78.62 in overstorey and 14.28 to 83.89 in understorey. The highest IVI values recorded by Shorea robusta in both over and understorey. The diversity(Shannon index value) ranged 1.28 (northern aspect) tp 1.67 (southern aspect) for overstorey and 1.10 (northern) to 1.59 (western) for understorey. The study illustrated that overstorey tree strata in the forest is more dominant than understorey. The Shamun index, Simpson's index. Spceies richness, Equitability and Beta diversity values were almost higher in overstorey as compared to unerstorey thereforer the present study reveals the normal regeneration pattern in the forest.

Keywords

Overstorey, Understorey, Salmixed Forest, Phytosociology, Diversity, Composition

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