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Negi, G. S.
- Studies on Variation of Strength Properties in Wood
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Indian Forester, Vol 87, No 2 (1961), Pagination: 87-93Abstract
Variation from pith to periphery in specific gravity, fibre stress at elastic limit, modulus of rupture, modulus of elasticity and maximum crushing stress (Compression Parallel to grain) for the species Cedrus deodara (deodar), Dipterocarpus grandiflorus (gurjan), Machilus macrantha (Machilus), Pinus roxburghii (chir), Shorea robusta (sal) and Tectona grandis (teak) were studied. In general it was found that in conformity with other workers the strength increases with distance from the pith but near the periphery it again decreases. However there were certain exceptions. Variations in strength of the material due to North, East, South and West directions were also studied but no significant differences were observed.
- Investigation on Strength Properties of the Species of Genus Gardenia
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Indian Forester, Vol 87, No 3 (1961), Pagination: 198-200Abstract
No abstract- A Point Sampling Trial with Prisms at New Forest
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Indian Forester, Vol 90, No 6 (1964), Pagination: 348-359Abstract
The results of point sampling conducted, probably for the first time in India, in 45.32 hectare chir stand of Champion Block, New Forest, using wedge prisms of basal area factors 10, 15, 20 and 25 in British units (2.296, 3.444, 4.591 and 5.739 in Metric units) are presented and compared with plot sampling of the same area. The study has demonstrated that prisms with B.A.F. 10 or 15 are most suitable for enumerating the stand. The results also indicate that point sampling based on 20 to 25 objectively selected sample points in 30 to 40 year old chir stands could furnish estimates of basal area per hectare and number of stem. per hectare with standard errors of 5 and 6 per cent of the true values Respectively.- Relative Efficiency of Strip Surveys in Forest Enumerations
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Indian Forester, Vol 92, No 7 (1966), Pagination: 473-476Abstract
The paper presents the results of a study of relative efficiency of three methods of strip sampling. It was found that systematic sampling with probability proportional to the area of the strips give higher precision.- The Accuracy of Basal Area Increment with Increment Borer
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Indian Forester, Vol 93, No 6 (1967), Pagination: 377-382Abstract
The paper presents the results of a study on the precision and accuracy of area increment by an increment borer and compares the area increment with that determined by a planimeter. 4 timber species were used in this study. The relative mean square errors were higher in magnitude than indicated by the estimates of precision while the area increments were underestimated in most cases.- Investigation of Plot Size from Uniformity Trial in a Forest Experiment
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Indian Forester, Vol 95, No 5 (1969), Pagination: 356-368Abstract
no abstract- A Study on Size and Shape of Plots for Grass Surveys
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Indian Forester, Vol 97, No 8 (1971), Pagination: 469-475Abstract
The paper presents the results of a pilot investigation on the size and shape of plots for grass land survey, conducted in Andhra Pradesh. The results based on systematic line plot survey indicate that square or circular plots of 4 square metres may provide equally precise estimates as larger sized plots in such areas. It has been suggested that estimate of grass yield within 10% margin of error may be obtained with a sample of about 70 plots. Systematic sampling with multiple random start has been recommended.- Point Sampling Trial in a Sal (Shorea robusta) Forest
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Indian Forester, Vol 97, No 10 (1971), Pagination: 577-592Abstract
The paper presents the estimates of Basal Area from point sampling with prisms of BAF-l, 2, 3, 4 and 5 sq m/hectare and compares them with those from plot sampling with 0.16 hectare plots in a pure sal forest. No significant difference in the estimates of basal area were observed either between the estimates from various prisms or between the two methods of sampling. The relative efficiency of point sampling taking time of cruise into consideration worked out from 200% to 400%, although the estimates from plot sampling were more precise. Prism of Basal Area Factor of 3 sq m/hectare is recommended for similar crops. It has been suggested that to estimate volume with a margin of error of 10% with a prism of BAF-3, about 50 sample points may be needed. However, the same accuracy could also be achieved even if measurements for volume are taken at comparatively lesser number of sample points and basal area which requires less time, estimated from a larger number of sample points.- Variation in Structure and Density within a Single Tree of Michelia champaca Linn.
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Indian Forester, Vol 100, No 7 (1974), Pagination: 453-465Abstract
Variation in anatomical structure and density has been studied in the main hole of a 25 year old tree of Michelia champaca grown at Newforest, Dehra Dun. For studying the variation from pith to periphery, consecutive blocks comprising 2-3 rings were taken along one radius and at two heights. For variations from bottom to top, two growth sheaths were investigated at eight levels. All anatomical data except fibre length were collected from cross sections by the point sampling method. There is no evidence of any consistent pattern in the variation in anatomical structure within the tree. However the fibre length shows a tendeney to increase from the pith outwards and to decrease from the bottom upwards though the trend in both cases is somewhat irregular. Density values within the tree also show a similar irregular trend. Both anatomical structure and density on the whole vary within rather narrow limits within a growth sheath except near the ground level. Study of the correlation between anatomical structure and density has shown that wall thickness, diameter and length of fibres account for 77 per cent of the variation in density. The proportion of fibres appears to have no significant effect on density.- A Comparative Study of some Distribution Functions as Applied to Diameter at Breast Height in Even-aged Stands
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