Effects of ozone and/or soil water stress on growth and Photosynthesis of Fagaus crenata seedlings

摘要

The effects of ozone (O_3) and soil water stress, singly and in combination, on the growth and photosynthesis of Fagus crenata seedlings were investigated. Four-year-old seedlings were exposed to charcoal-filtered air (＜5 nmol mol~-1 O_3), 7 hours per day (11:00-18:00), for 1456 days from 10 May to 11 October 1999 in naturally-lit growth chambers at 20/15 deg. C (6:00-18:00/18:00-6:00). During the same period, half of the seedlings in each gas treatment received 250 mL of water at the 3-day intervals (well- watered treatment), while the rest received 175 mL of water at the 3-day intervals (water-stressed treatment).