不同玉米品种水分利用效率的差异性研究  

Diversity of water use efficiency of various maize varieties

作　　者：杨涛[1] 梁宗锁[1] 薛吉全[2] 康绍忠[2] 

机构地区：[1]中国科学院水土保持研究所,杨凌712100 [2]西北农林科技大学,杨凌712100

出　　处：《农业工程学报》2005年第10期21-25,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家973项目(G1999011708);国家青年基金(59909007)"作物水分高效利用的生理学机制"

摘　　要：通过盆栽试验结果表明:12个品种在生物学产量、耗水量和水分利用效率上存在显著或极显著差异;12个品种的气孔导度与光合速率、蒸腾速率均呈直线相关,但气孔导度对蒸腾速率的相关系数>气孔导度对光合速率的相关系数;品种间气孔调节能力为农大60>中单2号>陕单911;正常供水条件下三个品种的根冠比相差不大,中度胁迫根系的相对总量为农大60>中单2号>陕单911,在正常水分条件下,三个品种的根系导水率为陕单911>农大60和中单2号,PEG中度渗透胁迫下根系导水率农大60增加了54.64%,中单2号下降了50.94%,陕单911下降了63.00%;渗透调节能力为陕单911>中单2号>农大60,三个品种的失水速度为陕单911>农大60>中单2号。Based on pot experiments and water experiments, the results show that water consumption, biomass accumulation and water use efficiency of 12 varieties existed obvious diversity; the relationships of Gs, Pn and Tr of 12 varieties were linear, the correlativity between Gs and Tr was higher than the correiativity between Gs and Pn; stoma adjustment ability was nongda 60〉zhong dan 2〉shandan 911; on the condition of normal water, distinguishing of root/canopy ratios of three varieties was not obvious; under middle water stress, root weight was nongda 60〉zhongdan 2〉shandan 911, the hydraulic conductivity of root was that nongda 60 increased 54. 64%, zhongdan 2, shandan 911 respectively declined 50. 94%, 63.00%; the osmosis adjusting capacity was shandan 911〉zhongdan 2〉nongda 60, the excised leaf water retention capability was shandan911〉nongda 60〉 zhongdan 2.

关 键 词：玉米品种 水分利用效率 差异 生理学原因 

分 类 号：S512.12[农业科学—作物学]