EFFECTS OF ACID RAIN ON YOUNGLING OF PINUS MASSONIANA AND CUNNINGHAMIA LANCEOLATA
模拟酸雨对马尾松和杉木幼树的影响

The effects of simulatad acid rain with pH values of 2.0, 3.0, 4.5 and 6.623(control) on youngling of Pinus massoniana and Cunninghamia le-nceolata were studied. The results showed that the pH of C. lanceolata leaf sap and soil decreased as the acidity of rainfall increased. In the case of low pH, the acid rain had significant effects on the photosynthetic rates per plant, but not on that per unit weight of dry leaf. The respiration rates of the two species were stimulated by the acid rain and root and leaf biomass, but not stem biomass. were also reduced dramatically during a seven months period.