The variation characteristics of ecological stoichiometric ratios can reflect the nature of plant adaptation to environmental changes.The C,N,and P contetns,and their stoichiometric ratios in different organs of rice were studied using a CO_2 continuous labeling system,by simulating the increase of atmospheric CO_2 concentration(800 × 10-6). The results showed that CO_2 doubling promoted the growth of rice organs and increased the root/shoot ratio. CO_2 doubling reduced the shoot TN content in different gro...