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在长白山站以开顶箱方式对4 年生长白松连续4 个生长季进行CO2 处理,包括700 和500 μmolmol-1 高浓度CO2,以及接受空气CO2的对照箱和不扣箱的裸露地条件(约350 μmolmol-1 CO2),通过测定气孔导度(gs),ci/ca比及气孔数量等指标评价气孔对高浓度CO2的响应。气孔导度及ci/ca比的转换实验表明,在各自生长CO2下和在相同测定CO2 下进行比较时,生长在高浓度CO2 下植株的气孔导度要高于空气CO2 下对照组植株的气孔导度(除700 μmol mol-1 CO2 下的植株在生长CO2 浓度下及在350 μmol mol-1 CO2 下测定时的气孔导度低于裸地植株外)。在各自生长CO2浓度下测定时,高浓度CO2下植株的ci/ca比低于对照组植株,但在相同测定CO2浓度下比较时,却是高浓度CO2下植株的ci/ca高于对照组植株的ci/ca比。高浓度CO2下植株与对照组植株在每单位长度气孔数量上无明显差异,但高浓度CO2通过降低气孔线数使长白松当年生针叶的总气孔数量降低,并且改变了气孔在针叶上、下表面的分配模式。表4 参18。
The 4-year-growing white pine was treated with open top box for four consecutive growing seasons in Changbai Mountain Station, including CO2 with high concentration of 700 and 500 μmol mol-1, control box with air CO2 and bare ground conditions 350 μmol mol-1 CO2). The stomatal responses to high concentrations of CO2 were evaluated by determining the stomatal conductance (gs), ci / ca ratio and the number of stomata. Stomatal conductance and ci / ca ratio conversion experiments showed that the stomatal conductance of plants grown in high concentration of CO2 was higher than that of the control plants in air CO2 when compared with CO2 and CO2 respectively Conductivity (except for plants at 700 μmol mol-1 CO2, which were lower at stomatal CO2 and at 350 μmol mol-1 CO2 than bare plants). When measured at their respective growth CO2 concentrations, the ci / ca ratio of plants at high CO2 concentrations was lower than that of the control plants, but at higher CO2 concentrations, the ci / ca of plants was higher than that of the control at the same CO2 concentration Plant ci / ca ratio. There was no significant difference in the number of stomata per unit length between high concentration CO2 plants and control plants. However, the high stomatal concentration of CO2 reduced the total number of stomata per plant and reduced the number of stomatal perforations , Under the surface of the distribution model. Table 4 Reference 18.