P. K. Mahajan , S. P. Dhall

Abstract

This study highlights the fact that the trends in the area under forest are not regular though the increase in the forest area in Himachal Pradesh was observed to be about 77 percent over the 17 years period ranging from 1979-80 to 1995-96. Almost perfect positive correlation is noted between change in 'total forest area' and 'protected forest area' when the effects of the variables such as 'reserved forest area', 'unclassified forest area', 'forest area not under the control of Forest Department' have been eliminated.

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Suresh Kumar ¹, N. K. Gupta ¹, P. K. Mahajan ², Deep Shikha ¹

Affiliations
1 Department of Silviculture and Agroforestry, Dr. Y.S. Parmar University of Horticulture and Forestry Nauni, Solan, 173230 (HP), IN
2 Department of Basic Sciences, Dr. Y.S. Parmar University of Horticulture and Forestry Nauni, Solan, 173230 (HP), IN

Abstract

The present study was carried out at four sites. The spacing of site-I was 1.5m × 1.5m; site-II: 1.0m × 3.5m; site-III: 3.0m × 3.0m and site-IV: 4.0m × 4.0m at Solan, Himachal Pradesh. The maximum species diversity and basal area (BA) of grasses and herbs (56.65 cm²/m² ) was at site-I having lowest plant spacing, with least basal area (BA) of shrub and woody regeneration (1.16 cm²/m² ). Lantana camara and Murraya koenigii showed there presence at all the sites among shrubs, having dominance of Lantana camara at sites-I, -III and -IV. Apluda mutica, Chloris gayana and Chrysopogon montanus were present in all the sites among different grasses and herbs, however, Apluda mutica showed dominance at site-I and -III, while, Chrysopogon montanus dominated at site-II and -IV. Bidens pilosa dominated at site-I and -IV, while Erigeron annus was present at site-II and -III among herbs. Maximum similarity (60.00 %) between site-I and -IV was observed for grasses and herbs, however, for shrubs and woody regeneration, it (80.00 %) was observed between 3.0m × 3.0m (site-III) and 4.0m × 4.0m (site-IV) spacing.

Keywords

Acrocarpus fraxinifolius, Spacing, Phytosociology.

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Bharti ¹, R. K. Gupta ¹, P. K. Mahajan ¹, K. R. Sharma ¹

Affiliations
1 Dr. Y.S. Parmar University of Horticulture and Forestry Nauni-Solan, Himachal Pradesh, IN

Abstract

The present investigation entitled 'Temporal Stability analysis of resin yield of natural regenerated Chir pine (Pinus roxburghii Sargent) in Himachal Pradesh.' was carried out during the year 2012-13 with the aim to identify the stable diameter classes with respect to resin yield obtained from Pinus roxburghii. Secondary data on resin yield for 145 trees for seven years w.e.f. year 2005 to year 2011 were taken from the Department of Forest Products, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. The tree set of 145 trees remain same for all the years. These trees were divided into seven diameter classes i.e. 30-35 cm, 35-40 cm, 40-45 cm, 45-50 cm, 50-55 cm, 55-60 cm and 60-65 cm depending upon the variability among data. Two stability models viz. Finlay and Wilkinson's model (1963) and Eberhart and Russell's model (1966) were used to identify the stable diameter class for the production of resin. Pooled analysis of variance was performed to detect the presence of diameter class (D) × year (Y) interaction. The effects due to Y, D and D × Y interaction were found to be significant. Finlay and Wilkinson's model suggested that the diameter class 40-45 cm had the mean (D) greater than the overall mean and regression coefficient bi was nearly equal to one. Eberhart and Russel's model indicated that the diameter class 40-45 cm had (0.35) which 2 was greater than zero, regression coefficient bi (0.872) which was nearly equal to one and low (s d). Thus, diameter i class 40-45 cm was identified as stable diameter class with respect to resin yield obtained from Pinus roxburghii. Therefore, it may be concluded that diameter class 40-45 cm was most stable for resin yield.

Keywords

Chir Pine, Finlay and Wilkinson’s Stability Model, Eberhart and Russel’s Stability Model.

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