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大气CO2浓度升高对亚高山红桦碳水化合物含量与分配的影响

期刊名称：西北林学院学报, 2008, 23(1): 1-5
时间：0
分类：S718.512.1[农业科学—林学]
作者机构：[1]中国科学院成都生物研究所,四川成都610041, [2]华东师范大学上海市城市化生态过程与生态恢复重点实验室,上海200062, [3]成都市新津县环境监测站,四川新津611430
相关基金：国家自然科学基金重大项目（90511008,90202010）、中芬国际合作项目（30211130504）和中国科学院“百人计划”资助项目（01200108C）.
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关键词： CO2浓度升高, 红桦幼苗, 碳水化合物, 含量, 分配, elevated CO2 concentration , Betula albo-sinensis seedlings , carbohydrate , content , allocation

中文摘要：

应用封闭式生长室系统，研究了川西亚高山红桦（Betula albo—sinensis）幼苗根、茎、叶和枝中碳水化合物含量及其分配和主要生长指标对大气CO2浓度升高（EC，Elevated CO2，环境CO2浓度＋350（±25）μmol·mol^-1）的响应。结果表明，红桦幼苗的树高、基径、树干基部横截面积和生物量等均受到CO2浓度升高的促进作用。与对照（CK）相比，CO2浓度升高显著增加了红桦幼苗根、茎、叶中的还原糖、蔗糖、总可溶性糖及淀粉含量。除蔗糖含量外，枝中还原糖、总可溶性糖和淀粉的含量也有显著增加。EC对红桦幼苗各器官中的纤维素含量没有显著影响。升高CO2浓度改变了碳水化合物在红桦幼苗根、茎、叶和枝中的分配格局；与CK相比，分配到根的还原性糖、蔗糖、淀粉、纤维素和总的可溶性糖分别增加了55．96％、35．76％、39．52％、29．36％和55．56％。综上所述，CO2浓度升高促进了红桦幼苗的生长，增加了红桦幼苗体内的碳水化合物含量及其在根部的积累，这将增强红桦幼苗对寒冷环境的抵抗力，提高其在环境中的竞争力。

英文摘要：

The effects of CO2 on carbohydrate contents, carbohydrate allocation, and growth of red birch （B. albo-sinensis） seedlings were investigated. The red birch seedlings were grown in the chambers which were controlled to reproduce ambient （CK） and elevated atmospheric CO2 concentration （EC, Elevated CO2, ambient＋350 （±25） μmol · mol^-1）. The results showed that elevated CO2 concentration had positive effects on tree height, stem diameter, stem cross sectional area and biomass of red birch seedlings. El- evated CO2 concentration remarkably increased the contents of reducing sugars, sucrose, soluble sugars and starch in leaves ,stem and roots of red birch seedlings respectively. And the reducing sugars, soluble sugars and starch increased significantly in branch. The EC treatment did not affect the contents of cellulose. Red birch seedlings grown under elevated CO2 concentration, allocated more reducing sugars, sucrose, soluble sugars, starch and cellulose by 55.96%, 35.76%, 55.56%, 39.52% and 29. 36% to root than those grown under ambient CO2 concentration. This indicated that elevated CO2 concentration increased carbohydrate contents and their accumulation to roots of red birch seedlings, which would enhance the ability of red birch to withstand high-frigid environment.

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