ABOVEGROUND LITTER PRODUCTION AND BIOELEMENT POTENTIAL RETURN IN AN EVERGREEN OAK (QUERCUS-ROTUNDIFOLIA) WOODLAND NEAR SALAMANCA (SPAIN)

Total aboveground production of trees has been determined in a Quercus rotundifolia evergreen oak woodland developed over a chromic Luvisol. The woodland is located close to the city of Salamanca (central-weste rn Spain). Litter fall occurs throughout the year, with a maximum from April to June owing to leaf fall. Mean litter production is 1.9 Mg ha (-1) year(-1), although variations from year to year are observed, mos tly due to water stress in summer. The mean area of influence of litte r fall of each tree is about 4 m outside the crown shadow and the leaf percentage (55%) over the total aboveground litter production shows t hat the system is mature. Tree inflorescences are found to have the hi ghest concentration in bioelements, although the latter are mostly ret urned through the leaves (with the exception of K).