二氧化碳的捕获与储存（CO₂ capture and storage，CCS）是全球CO₂减排最重要技术战略，其存在CO₂泄漏的风险，会对周围农田生态产生重要影响。深入认识植物对高浓度CO₂的响应并筛选对CO₂的耐受植物，为CCS项目区农业生产决策提供参考数据。本文设置玉米对不同CO₂浓度的响应情形，选择株高、鲜重、干重、净光合速率、蒸腾速率、气孔导度和胞间CO₂浓度作为玉米耐受的观测指标。结果表明，当CO₂浓度为10 000、20 000 μmol/mol时，玉米株高增高7%~12%，生物量增加10%~15%，净光合速率增加高达60%左右；当CO₂浓度为40 000、80 000μmol/mol时，玉米株高度减少9%~12%，生物量减少10%~17%，净光合速率减少35%~45%左右。一定程度CO₂浓度的增加，对玉米生长发育具有"施肥"效应；在更高CO₂浓度下，会抑制其生长发育，并未出现植株死亡的现象。通过CO₂耐受指数法（LCTI）计算得出，玉米可以作为地质封存CO₂泄漏的耐受植物。

CCS(CO₂ capture and storage) is considered as the most potential technology for global CO₂ emission reduction. However, it involves the risk of CO₂ leakage, which will have an important impact on the surrounding farmland ecosystem. So deep researching of the response of plants to high CO₂ concentrations and selecting tolerant plants to CO₂, so as to provide the reference data for agricultural production decisions in CCS project areas. In this paper, the plant height, fresh and dry biomass, net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO₂ concentration were selected as indicators of maize tolerant index for different CO₂ concentration. The results indicated that when the CO₂ concentration was 10 000 and 20 000 μmol/mol, the growth of maize in plant height, biomass, and net photosynthetic rate were promoted 7%-12%, 10%-15% and 60% respectively. while the CO₂ concentration was increased to 40 000 and 80 000 μmol/mol, the growth of maize in plant height, biomass, and net photosynthetic rate were inhibited 9%-12%, 10%-17% and 35%-45% respectively. The increase of CO₂ concentration within a certain range had a "fertilization" effect on the growth of maize, but at a higher CO₂ concentra-tion, the growth of maize would be inhibited and thus no death phenomenon had been observed in maize. Further-more, through CO₂ tolerance index method(LCTI), it was concluded that maize can be used as a tolerant plants for CO₂ leakage from geological storage.

国家高技术研究发展计划（“863”计划）“二氧化碳地质封存关键技术”（2012AA0501030）、陕西省教育厅自然科学研究计划项目“陕北典型C₃和C₄农作物对高浓度CO₂耐受性研究”（专项科研计划2019）