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V. N. Tandon , M. S. Negi , D. C. Sharma , H. S. Rawat

Abstract

Mineral cycling in four different aged Eucalyptus hybrid plantations bas been discussed. The componentwise distribution of nutrients at different ages and the nutrients removed as a result of whole tree harvesting has been presented. A total of 4565. 5242, 10236 and 9992 kg/ha of Jitter was produced annually at ages 4, 6, 8 and 10 years respectively. Out of the total litter, leaf litter contributed between 73 to 82 per cent, thus maximum nutrients are returned to the soil through leaf litter. Maximum return was observed for Nitrogen fonowed by Calcium, Potassium, Magnesium and Phosphorus.

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M. S. Negi , Y. N. Tandon , H. S. Rawat

Abstract

Estimates of component wise dry matter production and nutrient distribution of 10,20 and 30 years old plantations of Teak (Tectona grandis Linn. F) have been discussed. Linear rtlgresssion analysis was carried out. Among the prediction variables tried, DBH alone was found to give reasonably precise values of biomass and can be used for prediction purposes. The total standing biomass ofthese stands increases with increasing age and diameter from 74.5 t/ha (10 years) to 164.1 t/ha (30 years). Maximum amount ofN, P and Mg was accumulated in hole while higher accumulation of Ca was observed in bark and ischolar_mains. Harvesting of only utilisable biomass (148 t/ha) at the age of 30 years would result in the removal of247, 41, 170, 632 and 198 kg/ha ofN, P, K, Ca and Mgrespectively. Defoliating and debarking at the site is suggested to reduce the drain of nutrients from the soil especially Ca contents.

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V. N. Tandon , M. C. Pandey , H. S. Rawat , D. C. Sharma

Abstract

Componentwise biomass production and cycling of minerals in five different aged plantations of Poplus deltoides have been discussed. Correlation coefficient and regression models were worked out separately for each biomass component, total above-ground biomass and total biomass. Linear regression analysis was carried out. The predictor variable D.B.H. and D²H were tried. Correlation coefficients obtained were found to be highly significant in both the cases. Easily measurable parameter D.B.H. has been used in this paper. The total above-ground biomass of these stands ranges between 27 t/ha to 192 t/ha. Maximum amount of N, P, K and Mg were contained in bole while higbest accumulation of Ca was observed in bark. A total of 1354, 1942, 2888 and 2472 kg/ha of litter was produced annuany at ages 3, 5, 7 and 9 years respectively. Of the total annual litter, lear contributed maximum between 69.5% to 85.2%. The cycling of mineral through litter ran has also been discussed.

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M. C. Pande , V. N. Tandon , H. S. Rawat

Abstract

Studies on biomass production and nutrient distribution in plantation of Acacia nilotica, Acacia tortilis and Leucaena leucocephala under unirrigated and irrigated conditions have been undertaken. The biomass in irrigated areas was found to be much higher as compared to the unirrigated areas. Maximum accumulation of nutrients is observed in leaf and twig components in both areas. Some safeguard in terms of fertilization etc. have been suggested while raising the plantations of these species.

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M. C. Pande , V. N. Tandon , H. S. Rawat

Abstract

This paper presents the case study on work done on biomass production of some monocultures raised in eastern part of the country. Comparative total biomass and the timber production of Eucalyptus hybrid, Pinus patula, Pinus kesiya and Cryptomeria japonica have been discussed. Further studies to obtain more reliable and authenticated data on productivity has also been suggested.

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V. N. Tandon , M. C. Pande , Lajpat Rai , H. S. Rawat

Abstract

The distribution of biomass of Acacia nilolica at five different ages, in Haryana has been discussed. Prediction models were worked out seperately for each biomass component and the total above ground biomass. Linear model was found to be the best fit. Among the prediction variables tried D² was found to be the most reliable parameter for prediction of biomass. The total above-ground biomass ranges from 36 t/ha (5 years) to 307 t/ha (17 years). The above-ground biomass increases sharply after the age of 13 years.

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V. P. S. Verma , V. N. Tandon , H. S. Rawat

Abstract

The paper presents the biomass production its distribution among different biomass components and tbe distribution of nutrients in an age series of Casuarina equisetifolia plantations in Puri, Orissa. The total biomass ranges from about 19 tonnes (5 years) to 130 tonnes (15 years) per ha with 76% to 83% being contributed by the above ground biomass. An attempt has been made to explain the higher biomass production by first rotation crop for comparable ages. The distribution of nutrients in these ecosystems have also been discussed. As a result of harvesting, the main biomass components (bole, bark and branches), which are usually harvested, results in the removal of 59% (N), 50% (P), 63% (K), 65% (Ca), 66% (Mg) of the total amount of nutrients accumulated in the above ground biomass at the rotation age (15 yrs). Study on nutrient cycling is suggested to maintain the fertility of the soil of this ocality.

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