Abstract: The effects of elevated ozone on C fixation and translocation of rice were studied by using ¹³C isotope techniques. Two ozone treatments were performed: control (CK, with a daily average of 4-10 nL·L^-1) and elevated ozone (O₃, with an 8 h mean of 110 nL·L^-1). Compared to the control treatment, the elevated ozone concentration reduced ¹³C fixation by 37.8% and 20.0%, increased the sink strength of leaf by 47.3% and 37.5% after one and two months exposure respectively, while reduced the sink strength of stem and root. Ozone exposure induced a significant increase in sink intensity in leaves, and an obvious decrease in root but not a significant effect on stem. The relative specific uptake of leaves was significantly increased by 48.5% and 93.3% after one month and two months of ozone exposure, respectively, and that of root decreased significantly.

Key words: slope degree, habitat type, slope aspect, leaf area index, altitude, curvature