J. D. S. Negt , S. C. Sharma , P. L. Taneja

Abstract

Stemflow, throughfall and interception loss were studied in Pinus caribaea plantation at two different spacings (2 × 2 m, 3.5 × 3.5 m). The Interception loss (11.3%) was observed more in wide spacing compare to the close one. Equations for computing throughfall and stemflow have been developed to estimate the storage capacity of the entire canopy. The influxes of macro-nutrients in bulk precipitation and canopy Wash were measured during the peak rainfall months The nutrients added by bulk precipitation and canopy wash were: Ca 24.59, N 23.07, K 7.26, Mg 5.09 and P 0.21; K 13.26. ea 9.86, Mg 6.39, N 5.94 and P 0.19 kg ha-¹ yr-¹ respectively.

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D. C. Sharma , P. L. Taneja , A. P. S. Bisht

Abstract

The biomass, prductivity and nutrient cycling in a 24 year old Dalbergia sissoo plantation have been discussed in this paper. Out of the total above-ground biomass of 162 metric tonnes/ha the ischolar_mains contribute 15.4 per cent. Maximum concentration of nitrogen was observed in leaf and minimum in the bole. The highest concentration of calcium was found in bark and least in the bole. As compared with the annual uptake of nutrients, 63 per cent N, 50 per cent P, 48 per cent K, 67 per cent Ca and 57 per cent of Mg are returned to the soil annually through litter fall.

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