A. N. Singh , A. S. Raghubanshi , J. S. Singh

Abstract

The present paper deals with the height and diameter growth in young plantations of the three native tree species (Albizia lebbek, Albizia procera, Tectona grandis) planted on mine spoil situated in tbe eastern section of Jayant Block of Singrauli coalfield in Madhya Pradesh, India. Highest survival rate was observed in the case of A. procera and the lowest in the case of T. grandis. Maximum specific height growth rate and specific diameter growth rate was exhibited by T. grandis whereas A.lebbek registered the minimum specific rate of increase in height and diameter. Aalysis of mean specific growth rates both for height and diameter indicated a decline with age in all the three species. However, the decline in the specific height and diameter growth rate of T. grandis was faster than in A. lebbek and A. procera.

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Arvind Kumar Jha , Arvind Singh , A. N. Singh , J. S. Singh

Abstract

Plantation of Dendrocalamus strictus was raised on coal mine spoil at Jayant project, NCL, Singrauli in June 1993. Half and full dose of NPK fertilizer was applied. Full dose of NPK fertilizer was nitrogen as urea (60 kg ha^-1), phosphorus as single superphosphate (30 kg ha^-1) and potash as muriate of potash (40 kg ha^-1). Half dose of NPK treatment increased the height growth more whereas full dose of NPK treatment enhanced markedly the number of culms/clump and diameter growth of D. strictus.

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Arvind Kumar Jha , Arvind Singh , A. N. Singh , J. S. Singh

Abstract

The feasibility of direct seeding of tree species as a means of revegetating the flat (l.5 ha) and slopy areas (8 ha) of coal mine spoils was tested at Jayant Project, Northern Coal Fields Ltd., Singrauli. Direct seeding of tree species for 3-4 years with seeding of grasses and leguminous forbs is a potentially suitable technique for quick stabilization of flat and slopy areas of coal mine spoils. This technique is also beneficial in increasing the rate of recruitment of naturally colonizing plant species on mine spoils, which will ultimately restore the biodiversity and soil fertility of mine spoils, and will check the soil erosion from mine spoils.

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Arvind Kumar Jha , Arvind Singh , A. N. Singh , J. S. Singh

Abstract

Pennisetum pedicellatum and Heteropogon contortus grasses were seeded in tree plantation plots on coal mine spoils at Jayant Project, NCL, Singrauli. After three year of raising of plantations the tree canopies affected the growth of seeded grasses. The dense canopy of D. strictus, P. pinnata and L. leucocephala completely eliminated the seeded grasses H. contortus and P. pedicellatum. Under the dense canopy for G. arborea only H. contortus grows well whereas P. pedicellatum was eliminated. Thus to increase the herbaceous plant biodiversity and for the establishment of stable plant communities thinning of plantation plots after 3-4 years is essential, and H. contortus should be preferred in ground seeding compared to P. pedicellatum.

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Arvind Kumar Jha , J. S. Singh

Abstract

The growth performance of certain directly seeded leguminous trees, non-leguminous trees, leouminous forbs, grasses and crops were evaluated on 12 yr old flat surface coal mine spoil at Jhingurda Colliery, Northern Coal fields Ltd., Singrauli. Out of thirty plant species tried twenty four species showed satisfactory growth performance after one year of seeding. Cajanus cajon showed better growth performance on mine spoil than fertilized Agriculture Farm plots at Barkachha, Mirzapur. For quick revegetation of mine spoil seeding of plant species is a suitable method.

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V. P. Upadhyay , J. S. Singh

Abstract

Nitrogen content in decomposing oak and pine leaf litter was investigated for Central Himalayan forests. Leaf litter placed at pine forest site decomposed slowly and that of oak decomposed faster. Release of N was slower in Pinus roxburghii compared to Quercus lanuginosa. However, the magnitude of N immobilization was greater in Pinus roxburghii compared to Quercus lanuginosa. The oak forest favour external cycling, maximising release of N, whereas pine forest favour internal cycling minimizing the loss to the environment.

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R. K. Gupta , J. S. Singh

Abstract

The Tons valley lie. Between 30°55' and 31°28' N. latitude and 77°22' and 78°38' E. longitude in the Garhwal Himalayas. In the present paper physical features, climate, rock and soil, forest biota and vegetation of the area are described. The vegetation has been divided into various zones according to the altitude. Ecological status of vegetation types in each zone is discussed. Oaks form the climatic climax at the lower altitudes by Quercus incana Roxb. And at the higher altitudes by Quercus semecurpifolia Smith. Pinus roxburghii Sarg. Forests occurring in the subtropical zone are considered to be bioedaphic in nature forming a secondary succession to the oak climax and may be considered as pre-climax or sub-climax in Clement's terminology.

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