| 干旱对夏玉米根冠生长的影响 |
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| 引用本文： | 葛体达,隋方功,李金政,吕银燕,周广胜.干旱对夏玉米根冠生长的影响[J].中国农学通报,2005,21(1):103-103. |
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| 作者姓名： | 葛体达 隋方功 李金政 吕银燕 周广胜 |
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| 作者单位： | 1. 莱阳农学院农学系,山东莱阳版社,265200
2. 中国科学院植物研究所植被数量生态学开放研究实验室,北京,100093 |
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| 基金项目： | 国家重点基础研究发展规划项目资助(G1999043407). |
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| 摘 要： | 利用大型活动式防雨旱棚，人工严格控制不同的土壤含水量，全生育期系统研究了夏玉米根冠生长对水分的响应，结果表明：干旱并不影响夏玉米根系、冠层干物质累积、株高增加、茎(基)粗增大等过程的总趋势。但随胁迫的增强，根、冠干物质累积速率、干物质累积总量降低，根条数变少、株高降低、茎(基)粗变细，但它们并不呈线性相关关系；水分供应量的减少延长了夏玉米的生育周期，随胁迫的增强，根系生物量最大值、最大根条数、冠层最大株高出现的时间延后；根冠比(R/S)随土壤水分的改变而改变；不同水分处理的夏玉米，Ｒ/Ｓ值影响最小的时期是开花—灌浆盛期，最大的时期是在拔节—抽雄，此阶段充分供水处理H的Ｒ/Ｓ是严重水分胁迫处理L的125.77%。充分供水的处理则有最大的根冠比 ( R/S=0.173)。在干旱条件下，协调夏玉米根冠平衡，最大程度发挥根系和地上部叶片的功能，才有利于提高产量。
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| 关 键 词： | 夏玉米 根系 冠层 干旱 |
Effects of Drought on Growth of Root and Shoot of Summer Maize |
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| Ge Tid,Sui Fanggong,Zhang Jinzheng,Lu Yinyan,Zhou Guangsheng.Effects of Drought on Growth of Root and Shoot of Summer Maize[J].Chinese Agricultural Science Bulletin,2005,21(1):103-103. |
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| Authors: | Ge Tid Sui Fanggong Zhang Jinzheng Lu Yinyan Zhou Guangsheng |
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| Institution: | (1Dep. of agro. Laiyang Agricultural College, Laiyang Shandong, 265200)
(2Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093) |
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| Abstract: | Using large moving water proof installations, controlling different soil water content strictly by people, a systematic study was conducted to the response of drought on growth of root and shoot of summer maize during the growing period. The results indicate: root growth, shoot growth and the ratio of root/shoot (R/S) get changed, and the growth period becomes longer when water supply is decreased although the general accumulative trend of root and shoot, plant height, stem diameter of summer maize is not affected by drought. The responses of root and shoot to the same water condition are not identical. With the strength of stress, the time of the maximum of root and shoot dry weight, plant height, stem diameter become later compared with the full-water treatment. R/S is changed under the different soil content. Water treatment had the lowest effect on R/S during the flowering stage to the filling stage and the maximal effect on R/S during the jointing stage to the heading stage. R/S of treatment H was 125.77% times as much as treatment L at this period. Under the full-watered treatment, the ratio of R/S is the largest(R/S=0.173),which may be caused by the building of extensive root system. These results suggested that harmonizing the balance of root-shoot under drought stress, playing the role of root and leaf at most could enhance yield. |
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| Keywords: | Summer maize Root Shoot Drought |
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