Within an equilibrated forestry ecosystem there is a close relationship between annual leaf litterfall to the soil and litter decay constant. The goal of this work was to determine the leaf litterfall of the black Carob tree [Prosopis nigra (Griseb) Hieron.] and Quebracho Colorado Chaqueño (Schinopsis balansae Engl.) and the decay constants for leaf litter in the Parque Chaqueño Húmedo Argentino. The annual decay constant (k ) was calculated using a single exponential model. The Quebracho Colorado Chaqueño produced greater amounts of vegetative litter material (379.7 kg ha 21 ) than the black Carob tree 300.6 kg ha 21 . The black Carob tree had a higher annual decay constant ðk ¼ 0:08Þ compared with Quebracho ðk ¼ 0:06Þ: Assuming that a higher decay constant means shorter nutrient retention for time fallen
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