论文部分内容阅读
本文研究了ＣＯ２加浓对暖温带落叶阔叶混交林典型自然群落建群种辽东栎的影响，结果表明：在生理学方面，ＣＯ２倍增下气孔阻抗略增大，为对照的１０６％，蒸腾速率略下降，为对照的９２％，暗呼吸速率与对照很接近，但略微下降为对照的９８．９％。净光合速率、昼夜净光合量、水分利用效率都明显提高，分别为对照的１５５％，１７２％和１７９％。可以看出ＣＯ２倍增对辽东栎的生理过程有促进作用，属正效应。其中以生长旺季６、７月增长更为明显。在生长方面，ＣＯ２倍增下生长各项指标增长也较明显，叶面积为对照的１０７％，叶干重为对照的１４０％，以植株高度增加最明显，为对照的３３１％，清楚的看出辽东栎的生长与生理过程的变化趋势是一致的、均属正效应。也就是说在其他环境资源满足植物要求时，ＣＯ２倍增对树木具有“施肥”作用，它可促进植物的生理过程和提高其生物生产力。
This paper studied the effects of CO2 enrichment on the Quercus liaotungensis, a typical natural community in warm-temperate deciduous-deciduous broad-leaved forest. The results showed that the stomatal impedance slightly increased at CO2 multiplication, which was 106% of the control, and the transpiration rate was slightly Decreased to 92% of the control, dark respiration rate was close to the control, but slightly decreased to 98.9% of the control. Net photosynthetic rate, diurnal net photosynthesis, water use efficiency were significantly increased, respectively, the control of 155%, 172% and 179%. It can be seen that CO2 doubling has a positive effect on the physiological process of Quercus liaotungensis. Among them, the growing season of June and July increased more obviously. In terms of growth, the indexes of growth under CO2 doubling also increased obviously, the leaf area was 107% of the control and the leaf dry weight was 140% of the control, with the most obvious increase of the plant height, which was 331% of the control, clearly showing Quercus liaotungensis growth trends and physiological processes are consistent, are positive effects. That is to say, when other environmental resources meet the requirements of plants, CO2 doubling has the effect of “fertilizing” the trees, which can promote the physiological processes of plants and improve their biological productivity.