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大气CO_2浓度升高对植物的影响是目前植物生态学研究中普遍关注的问题。以往的研究主要关注植物地上部分叶解剖结构及生理功能的改变,而对根解剖结构和生理功能变化以及根与叶变化之间潜在联系的研究较少。该文以三年生红松(Pinus koraiensis)幼苗为研究对象,通过CO_2浓度倍增(从350μmol·mol~(–1)增加到700μmol·mol~(–1))试验,研究当年生针叶和根尖解剖结构及生理功能的变化。结果表明:(1)CO_2浓度倍增处理的红松幼苗,气孔密度显著降低,叶肉组织面积、木质部及韧皮部面积明显增加;(2)CO_2浓度倍增导致红松幼苗根尖直径增粗,皮层厚度和层数显著增加,管胞直径变小;(3)高CO_2浓度处理下,叶气孔导度和蒸腾速率降低,光合速率和水分利用效率提高,同时根尖的导水率显著下降,但管胞的抗栓塞能力显著提高。这些结果显示,叶和根解剖结构及生理功能在CO_2浓度升高条件下具有一致的响应。未来研究中应该同时关注全球气候变化对植物地上和地下器官结构与功能的影响。
The effect of atmospheric CO 2 concentration on plants is a common concern in plant ecology. Previous studies mainly focused on the changes of the anatomical structure and physiological functions of some leaves of the plants, but few studies on the potential relationship between changes of root anatomical structures and physiological functions and the changes of roots and leaves. In this study, Pinus koraiensis seedlings of three-year-old were selected as the research object. Through doubling CO 2 concentration (from 350 μmol · mol -1 (-1) to 700 μmol · mol -1) Tip anatomical structure and changes in physiological function. The results showed that: (1) The stomatal density decreased significantly and the area of leaf tissue, xylem and phloem increased obviously. (2) The diameter of root tip of Korean pine seedling increased, the thickness of cortex and (3) Under high CO_2 treatment, leaf stomatal conductance and transpiration rate decreased, photosynthetic rate and water use efficiency increased, while root hydraulic conductivity decreased significantly, but the number of tracheids The anti-embolic capacity was significantly improved. These results show that leaf and root anatomy and physiology have consistent responses under elevated CO 2 concentrations. Future research should also focus on the effects of global climate change on the structure and function of plant aboveground and underground organs.