MYCORRHIZAE OF JAPANESE BLACK PINE (PINUS-THUNBERGII) - PROTECTION OFSEEDLINGS FROM ACID MIST AND EFFECT OF ACID MIST ON MYCORRHIZA FORMATION

To determine the effects of acid precipitation on Japanese black pine (Pinus thunbergii Parl.) with and without mycorrhizae (Pisolithus tinc torius (Pers.) Coker et Couch), 1-year-old seedlings were exposed to s imulated acid mist, pH 3.0, for 10 min per day twice a week for 3 or 4 months. Simulated acid mist adversely affected the transpiration rate and lowered the extractable phosphorus content of seedlings, but seed lings with mycorrhizae were less affected by acid mist than were nonmy corrhizal seedlings. Simulated acid mist also retarded mycorrhiza form ation.