Structure and Function of Oak Forests in Central Himalaya. II. Nutrient Dynamics |
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Authors: | RAWAT Y S; SINGH J S |
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Institution: | Department of Botany, Kumaun University Naini Tal, 263 002, India
*Department of Botany, Banaras Hindu University Varanasi, 221 005, India |
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Abstract: | This paper elucidates nutrient dynamics in oak forests previouslyinvestigated for dry matter dynamics. The nutrient concentrationsin different life forms were of the order: herb > shrub >tree, whereas the standing state of nutrients were of the order:tree > shrub > herb. Soil, litter and vegetation, respectively,accounted for 32·498·0 %; 0·33·5%, and 10·266·6 % of the total nutrientsin the system. Considerable reductions (8·541·7%)in concentrations of nutrients in leaves occurred during senescence.The uptake of nutrients by vegetation, and also by differentcomponents with and without adjustment for internal recycling,has been calculated separately. Annual transfer of litter (above+ below ground) to the soil by vegetation was 115·9187N, 7·515·6 P, 122·7195·1Ca, 36·148·8 K and 2·885·16Na kg ha1 yr1. Turnover rate and turnover timefor different nutrients ranged between 0·660·84yr1 and 1·191·56 yr1, respectively.Compartment models for nutrient dynamics have been developedto represent the distribution of nutrient contents and net annualfluxes within the system. Quercus leucotrichophora forest, Q.floribunda forest, Q. lanuginosa forest, Nutrient concentration, standing state, uptake, internal cycling, turnover |
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