CO_2浓度升高对水稻抽穗期根系有关性状及根碳氮比的影响  

Effects of Free-Air Carbon Dioxide Enrichment(FACE) on Some Traits and C/N Ratio of Rice Root at the Heading Stage

作　　者：陈改苹[1] 朱建国[1] 庞静[1] 程磊[1] 谢祖彬[1] 曾青[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008

出　　处：《中国水稻科学》2006年第1期53-57,共5页Chinese Journal of Rice Science

基　　金：国家自然科学基金资助项目(4023100340271061);国家自然科学基金重大国际合作研究资助项目(40120140817);中国科学院知识创新重要方向项目(KZCX2-408)

摘　　要：在FACE(free-air carbon dioxide enrichment)实验平台上,采用水培的方法观测了抽穗期水稻根系的生长情况。结果表明,FACE条件下根生物量、根体积和根冠比极显著增加且不定根明显增多、变粗。高CO_2浓度显著降低了根中N含量,而C含量变化不明显,导致碳氮比极显著增加。基于单位根质量的根系活力在CO_2浓度增加条件下极显著降低,养分吸收效率的降低可能是根中N含量下降的重要原因。Rice root growth was examined by using hydroponics in a FACE（free air carbon dioxide enrichment）study. Root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diameter were all increased significantly under FACE conditions. CO2 enrichment decreased the N content in the rice root, but did not change the C content, leading to an obvious increase in the ratio of C/N. Elevated CO2 decreased the rice root activity remarkably. Decrement in nutrient uptake efficiency may be the mechanism of decreased N content in root.

关 键 词：CO2浓度增加 水稻 根碳氮比 根系活力 

分 类 号：S511[农业科学—作物学]