蒙古栎(Quercus mongolica)是中国东北地区天然次生林重要组成树种,研究该树种幼苗有机碳积累及碳库容对未来气候变化的响应,可为预测未来气候变暖情景下蒙古栎林的天然更新及幼苗的培育提供科学参考。该文旨在探讨CO2浓度和温度升高综合作用对蒙古栎幼苗非结构性碳水化合物(NSC)积累及其分配的影响。实验环境条件用人工气候箱控制,控制条件如下:1)CO2浓度倍增(700μmol·mol-1),温度升高4℃处理(HCHT);2)CO2浓度正常(400μmol·mol-1),温度升高4℃处理(HT);3)CO2浓度和温度均正常,即对照组(CK);每个气候箱幼苗分别在3种氮素水平下生长:N2(15mmol·L-1,高氮),N1(7.5mmol·L-1,正常供氮)和N0(不施氮),一共为9个处理。研究结果表明,1)HCHT共同作用对NSC积累无促进作用,但改变了植物各器官中NSC的分配比例,叶片中可溶性糖和淀粉的积累明显增加,HCHT下N2水平有利于NSC的积累。2)HT明显影响了蒙古栎一年生幼苗NCS的积累和分配。在N2水平下,HT明显促进NSC的积累,并增加了在主根中的分配比例。3)植株各器官可溶性糖含量的动态变化因处理不同而异。主根淀粉含量随时间逐渐增加,而细根淀粉含量随时间逐渐减少。在未来气候变暖的情况下,土壤中大量的氮供给,可能将促进蒙古栎幼苗的生长、增加其碳库容和抵御不良环境的能力,进而提高其天然更新潜力。 Quercus mongolica, an important tree species of natural secondary forest in northeastern China, studies the response of organic carbon accumulation and carbon storage of this tree species to future climate change. It may be used to predict the natural regeneration and seedling development of Quercus mongolica in the future under the background of climate warming. Provide a scientific reference. This paper aims to investigate the effects of elevated CO2 concentration and temperature on the accumulation and distribution of non-structural carbohydrates (NSC) in Quercus mongolica seedlings. The experimental conditions were controlled by an artificial climatic chamber under the following control conditions: 1) Doubled CO2 concentration (700 μmol · mol-1), elevated temperature 4 ° C (HCHT); 2) Normal CO2 concentration 400 μmol · mol- (HT); 3) CO2 concentration and temperature were normal, that is, the control group (CK); Seedlings of each climate chamber were grown under three nitrogen levels: N2 (15mmol·L-1, ), N1 (7.5mmol·L-1, normal nitrogen supply) and N0 (no nitrogen application), a total of 9 treatments. The results showed that: 1) HCHT did not promote the accumulation of NSC, but changed the distribution proportion of NSC in various organs of plants, the accumulation of soluble sugar and starch in leaves significantly increased, and the level of N2 under HCHT was conducive to the accumulation of NSC. 2) HT significantly affected the accumulation and distribution of annual seedling NCS in Quercus mongolica. At the N2 level, HT significantly promoted the accumulation of NSCs and increased the distribution ratio in the main root. 3) The dynamic changes of soluble sugar content in different organs of plants vary with different treatments. The main root starch content increased with time, while the fine root starch content decreased with time. In the future climate warming, the supply of large amounts of nitrogen in the soil may promote the growth of seedlings of Quercus mongolica, increase their carbon storage capacity and resist the adverse environment, thereby enhancing their natural renewal potential.