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人工气候室中测定了不同ＣＯ２（０－１０００ｍｇｍ－３）浓度时不同无性系长白落叶松二年生扦插苗的净光合速率、蒸腾速率和水分利用率等，并做了回归分析。结果表明，净光合速率和水分利用率随ＣＯ２浓度的增加而升高，蒸腾速率随ＣＯ２浓度的增加而降低，但不同无性系的ＣＯ２响应方式及强度不同。不同无性系长白落叶松的ＣＯ２补偿点亦不同。这些差异是无性系选择的基础。在无性系选择中，净光合速率和水分利用率的ＣＯ２响应具有重要的意义，而ＣＯ２补偿点意义不大。在未来高ＣＯ２环境中，长白落叶松的生长将加快，分布区将扩大
The net photosynthetic rate, transpiration rate and water use efficiency of biennial cuttings of Larix olgensis at different CO2 (0-1000 mgm-3) concentrations were determined in the artificial climate chamber. The regression analysis was carried out. The results showed that the net photosynthetic rate and water use efficiency increased with the increase of CO2 concentration, while the transpiration rate decreased with the increase of CO2 concentration, but the CO2 response modes and intensities of different clones were different. The CO2 compensation points of different clones are also different. These differences are the basis of clonal selection. In clonal selection, the CO2 response of net photosynthesis rate and water use efficiency is of great significance, while CO2 compensation point is of little significance. In the future high-CO2 environment, the growth of Larix sibiricus will speed up, the distribution will be expanded