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Annals of Botany 75: 249-258, 1995
© 1995 Annals of Botany Company

Structure and Function of High Altitude Forests of Central Himalaya II. Nutrient Dynamics

B. S. Adhikari, Y. S. Rawat and S. P. Singh

Department of Botany, Kumaun University, Naini Tal-263 002, India

This paper deals with nutrient dynamics in horse chestnut, silver fir and kharsu oak forests in a high altitude region of Central Himalaya. In general, the nutrient concentrations in different life forms were of the order: herb > seedling > shrub > sapling > tree, whereas the standing state of nutrients were of the order: tree > herb > shrub > sapling > seedling. Of the total nutrients in the system, soil litter and vegetation, respectively accounted 66·5, 0·6 and 32·9% in horse chestnut, 61·4, 0·8 and 37·8% in silver fir, 58·1, 0·8 and 41·1% in kharsu oak forests. Considerable reductions in concentrations of nutrients in leaves occurred during senescence. Annual transfer of litter (above-ground+below-ground) to the soil by vegetation of all forests ranged from 68-163 for N, 4-7 for P, 26-48 for K, 62-150 for Ca and 2-4 kg ha-1 year-1 for Na. Turnover time for different nutrients ranged between 1·41 and 1·75 years for horse chestnut, 1·33 and 2·13 years for silver fir, and 1·32 and 1·75 years for kharsu oak forests. The distribution of nutrient contents and net annual fluxes within the system have been developed to represent nutrient dynamics in compartment models.Copyright 1995, 1999 Academic Press

Standing state, turnover, retranslocation, nutrient concentration, internal cycling, uptake


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