tailieunhanh - Báo cáo khoa học: "Litter fall and nutrient turnover in Kermes oak (Quercus coccifera L.) shrublands in Valencia"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Litter fall and nutrient turnover in Kermes oak (Quercus coccifera L.) shrublands in Valencia. | Ann. Sci. For. 55 1998 589-597 Inra Elsevier Paris 589 Original article Litter fall and nutrient turnover in Kermes oak Que reus coccifera L. shrublands in Valencia eastern Spain Isabel Canellasa Alfonso San Miguelb C1FOR-INIA Apdo. 8111 28080 Madrid Spain . Ingenieros de Montes UPM Ciudad Universitaria 28040 Madrid Spain Received 12 May accepted 26 November 1997 Abstract - Litter fall has been measured in three Kermes oak Quercus coccifera shrublands 10 40 and 70 years after fire in the province of Valencia eastern Spain . Annual inputs varied between and ha 1 year-1 . with more than 90 of them coming from Kermes oak. In spite of the perennial character of this species under our experimental conditions it behaved as a deciduous one and showed litter fall peaks in May. Leaf litter was the most important source of nutrient return to the soil 60-70 followed by twig and flower and fruit litter. The total nutrient input macro- and oligo-elements due to litter fall was kg ha-1 year-1. Ca is the most important element followed by N K Mg and Na. The input of Fe Mn Zn and Cu due to litter fall was kg ha-1 year-1. Inra Elsevier Paris Kermes oak litter fall nutrient turnover retranslocation Quercus coccifera Resume - Production de litière et apport au sol d elements minéraux dans des garrigues de chêne Kermès Quercus coccifera L. dans la region de Valence Espagne . La production de litière du chêne Kermès Quercus coccifera a été déterminée à Valencia Espagne dans des garrigues âgées de 10 40 et 70 ans après incendie. La production varie de à t ha 1 an 1 dont plus du 90 correspond au chêne Kermès. Bien que le chêne Kermès soit une espèce à feuilles persistantes dans les conditions de notre experience le rythme de retombée de litière est de type annuel et le chêne Kermès se comporte comme une espèce décidue facultative avec une chute des feuilles pendant le mois de mai. Les feuilles constituent la source .