Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Effect of simulated acid rain on mycorrhizae of Aleppo pine (Pinus halepensis Miller) in calcareous soil. | Ann Sci For 1996 53 947-954 Elsevier INRA 947 Original article Effect of simulated acid rain on mycorrhizae of Aleppo pine Pinus halepensis Miller in calcareous soil M Honrubia G Diaz Depto Biologia Vegetal Fac Biologia Univ Murcia Campus Espinardo 30100 Murcia Spain Received 19 October 1995 accepted 15 January 1996 Summary - Mycorrhiza formation and plant growth in particular root development of Pinus halepen-sis were studied in relation to the influence of pH from simulated rain in pot cultures. Four treatments of water and were established by adding a mixture of sulphuric and nitric acids 2 1 v v or 10 NaOH to distilled water. Three experiments were carried out I seedlings growing in calcareous forest soil II 2-year-old naturally mycorrhizal seedlings transplanted into vermiculite in order to differentiate old and new-formed roots and Hi seedlings growing in peat vermiculite inoculated with mycelial inoculum of Suillus collinitus. Although no visible effects on the aerial part were observed a reduction of root length in the most acidic treatment was noted. Enhancement of ectomycorrhizae formation was also recorded in this treatment in the three experiments. In substrata of neutro-basic pH short-term exposures to acid rain positively affected ectomycorrhizal fungi in particular Suillus species. acid rain mycorrhizae pH Pinus halepensis plant growth Resume - Effet du pH d une pluie acide simulée sur les mycorhizes de pin d Alep Pinus halepensis Miller sur sol calcaire. L effect du pH d une pluie simulée surla formation des myco-rhizes etsurla croissance de Pinus halepensis a été étudié. Les traitements de pH de I eau 7 5 6 0 4 on été établi par addition at eaudlstlllée de HSO-otHNO. 2 1 v v OU de NaOH 10 Trois essais ont été conduits i des plants sur sol forestier calcaire II plants ages de 2 ans naturel-lement mycorhizes transplantés dans la vermiculite pour differencier les racines préexistantes des racines nouvellement formees et Hi .