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Fodder shrubs and trees have both economic as well as ecological values in most extensive systems of arid and semiarid regions.     As hypothesis, there is a relationship between the litterfall pattern and the foliar biomass production in forest plantations of semiarid areas, depending on the different seasons and species.     The studied species were:  Acacia berlandieri  (Benth.),  Acacia wrightii  (Benth.),  Ebenopsis ebano  (Berl.)   Barneby,  Havardia pallens  (Benth.) Britton &amp;amp; Rose and  Helietta parvifolia  (Gray) Benth.     The foliar biomass was evaluated seasonally, from the dry weight of a representative branch of each species. The litterfall was collected every 15 days through litter traps installed under tree canopies, in experimental plantations of 30 years old, in the semi-arid zone of northeastern Mexico.     There were highly significant differences (p&amp;lt;0.01) both among   species as seasons in the foliar biomass values, whereas there were no significant differences (P&amp;gt;0.05) among species in litterfall, but highly significant differences (P&amp;lt;0.01) among seasons. The foliar biomass reached the maximum production in summer (9029 kg ha -1 ) with  E. ebano , while the lowest value (103 kg ha -1 ) was recorded with  A. wrightii  in winter. The litterfall greatest accumulation occurred in winter (296 kg ha -1 ) with  A. wrightii . A significant linear correlation (R 2 =63%) was determined between accumulation of litterfall and foliar biomass production.    As conclusion, the litterfall pattern is related to the foliar biomass production, depending on the seasons and species. That constitutes a practical tool for the management of the forest ecosystems in semiarid areas.

Foliar biomass production and litterfall pattern of five timber species in forest plantations of semi-arid lands of the northeastern Mexico