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The net primary productivity and budget of total nitrogen and available phosphorus in the herbaceous layer was studied in a tropicaldry deciduous thorn forest in Rajasthan state of north-western India. The average net primary productivity of the herbaceous layerwas 242 g m-2yr-1, it was the highest (257 g m-2 yr-1) at the top and the lowest (218 g m-2 yr-1) at the middle of the hill slope. Out ofthe herbaceous species present in the study site, 29 species contributed more than 1 g m-2 biomass with the highest contribution byBrachiaria ramosa (54%) and Achyranthes aspera (44%). The herbs allocated about 10 and 90% of total biomass to roots and above-groundparts, respectively. The highest content of nitrogen in the soil, biomass, and litter was 181, 3.4, and 1.7 g m-2, respectively, during therainy season in July. A similar pattern was observed for phosphorus. The annual uptake of nitrogen and phosphorus by vegetation was3.84 g m-2 and 0.76 g m-2 ; 19 and 16%, respectively, return to the soil through litterfall. Before the litterfall occurred, the nitrogen, a vitalelement was translocated into below-ground parts. This is a strong strategy for the conservation of nitrogen. Phosphorus, however, didnot show such a trend. This interesting observation of the study strongly indicated that a sufficient amount of nutrients are retained inthe litter during the dry summer period.

international journal of plant and environment

Net Primary Productivity and Budget of Nitrogen and Phosphorus in the Herbaceous Layer of a Tropical Dry Deciduous Forest in Rajasthan in Northwest India