The Impacts Of Leakaged Carbon Dioxide From Underground On Surface Typical Vegetations

In recent years, global climate change caused by greenhouse gas has already became a threat to our earth. More and more countries have pay attation to how to reduce greenhouse gas emissions. CO2 geological storage technology is one of the effective ways to decrease greenhouse gas emissions. However, the stored CO2 exgists the leakage risk, which may affect the ecological environment near the leaking point. Vegetation is an important part of the ecosystem, its growth situation is usullay used to behalf of the environment. The paper is aimed at filter out sensitive indicators and plants by studing response of five vegetations to high concentration CO2 in soil. The research is useful to assess the effect of the leakaged CO2 to the ecological environment.In order to reflect the geological storage CO2 leaking as naturally as possible, the CO2 is accessed to the bottom of experiment device with the setting concentration and escaping freely to soil tillage layer. This setting CO2 concentration is 50000 ppm, 100000 ppm, 150000 ppm, and the selected plant are ryegrass, wheat, pea, corn and amaranth. In the research the plant growth trait: germination rate, plant height, leaf number, amont of fruit and physiological and biochemical indicators: soluble protein content, soluble sugar content, proline content, malondialdehyde content, catalase activity, peroxidase activity, superoxide dismutase activity are determined. The main conclusions in study are obtained as follows:(1) Plant seedling emergence, height, leaf number and fruit production decrease and leaf turn yellow with the soil CO2 concentration elevated. Among them, wheat and maize plant height respectively are lower 44.94% and 33.45% in 50000 ppm area than the control. They are showed the significantly decreasing; Corn and amaranth leaf number is reduced by 20% and 46.15% respectively in 50000 ppm and 100000 ppm experiment area comparing with the control area. Pea seeding emergence, fruit weight and number of fruit show a significant negative correlation with the elevated concentration. The coefficients separately are 0.948, 0.912 and 0.981.(2) When the plant is in salt stress environment, it will relieve the stress injuries through antioxidant system and osmotic adjustment. Soluble sugar of osmotic regulation substances and peroxidaseof antioxidant enzyme are sensitive to resist the salt stress caused by the elevated soil CO2 concentration.(3) Synthetically cosidering the response of five plants different aspects to environment, it can be seen that C3 plant – pea planted in greenhouse, C4 plant – corn growing in outhouse showed special sensitivity to the stress which caused by the elevated CO2 in the soil.