摘要
本研究以湘早籼45号和陆两优996为材料,研究了不同栽培模式下水稻体内镉（Cd）积累特性及其与光合生理之间的相关性。研究结果表明,在常规水育秧（T1）、软盘育秧（T2）、旱育秧（T3）、直播（T4）4种不同栽培模式下,产量差异达显著水平（P〈0.05）,2个品种均在直播模式下产量最高;从不同器官来看,镉含量最高的是根系,最高可达10.19 mg·kg^-1,其次是茎秆、叶片,稻谷中含量最低;水稻体内重金属镉主要分布在茎秆中,占吸收总量的41.53%-54.67%,稻谷中镉分布量占4.92%-14.36%;直播栽培模式下植株对重金属镉的吸收能力最强,各个器官中的镉均显著高于其他3种栽培模式;光合生理特性与水稻各器官镉含量、积累量具有一定相关性,其中蒸腾速率与稻谷中镉积累量呈显著正相关,相关系数为r=0.684（P=0.029）。
Relationships between cadmium uptake characteristics and photosynthetic physiology of rice were studied by using Xiangzaoxian45 and Luliangyou 996 as materials under four cultivation modes： conventional water raised seedling（T1）, nursery seedling（T2）, dryland raised seedling（T3）, direct seeding（T4）. The results showed that different cultivation modes had significant effect on the yield of two cultivars. The cadmium content of different organs followed the sequence of rootstemleafgrain. The cadmium uptaked by rice were mainly distributed in the stem, which accounted for 41.53%-54.67% of the gross number, the grain just occupied 4.92%-14.36%. The absorptive ca-pacity of cadmium of direct seeding mode was stronger than the other three modes, and the cadmium content of each organ was higher than the other three cultivation modes significantly. Certain relevance exsisted between photosynthetic physiological characteristics and the cad-mium content, accumulation of each rice organ. There were significant correlation between cadmium content of grain absorbed and transpira-tion rate. The correlation coefficient was r=0.684（P=0.029）.
出处
《农业资源与环境学报》
CAS
2014年第5期450-455,共6页
Journal of Agricultural Resources and Environment
基金
湖南省科技重大专项(2011FJ1002)
"十二五"国家科技计划粮食丰产科技工程(2011BAD16B01)
关键词
水稻
栽培模式
镉
光合速率
蒸腾速率
相关性
rice
cultivation mode
Cd
photosynthetic rate
transpiration rate
correlation
