强化栽培下水稻穗分化期叶片光合速率与水分利用率的研究  

Photosynthetic Rate and Water Use Efficiency of Leaves at Different Positions During Panicle Initiation Stage Under the System of Rice Intensification (SRI)

作　　者：林贤青[1,2] 周伟军[1] 朱德峰[3] 张玉屏[3] 杨国花 

机构地区：[1]浙江大学农业与生物技术学院 [2]中国水稻研究所水稻生物学国家重点实验室,浙江杭州310006 [3]中国水稻研究所水稻生物学国家重点实验室 [4]浙江省富阳市农业广播学校

出　　处：《中国水稻科学》2005年第2期132-136,共5页Chinese Journal of Rice Science

基　　金：农业部农业结构调整重大项目(2003 01 02A);浙江省"水稻好气灌溉技术研究"重点资助项目(011102378)。

摘　　要：用超级杂交稻两优培九、Ⅱ优7954和国稻1号作为研究材料,比较SRI水稻穗分化期不同移栽密度叶片光合速率和水分利用率。结果表明,SRI水稻稀植后能保持一定的叶面积指数,随着移栽密度从1.95×105 丛/hm2 下降到0.75×105丛/hm2 ,群体透光率增加,各叶位(第9叶至第13叶)叶片的光合速率和水分利用率明显提高,蒸腾速率降低,抽穗整齐度下降,第9叶和第10叶的光合速率和水分利用率提高的幅度较大。在试验条件下,水稻强化栽培的产量在移栽密度为1 65×105 丛/hm2 时最高。The super hybrid rice combinations, Liangyoupeijiu, Ⅱyou 7954 and Guodao 1 were used as experimental materials under different transplanting densities, to study the photosynthetic rate and water use efficiency of leaves at different positions during panicle initiation stage under the system of rice intensification. When the transplanting density was decreased from 1.95×10 5 to 0.75×10 5 hills/ha under the SRI, the leaf area index remained constant, and the light transmittance of canopy,the photosynthetic rate and water use efficiency of the 9th to 13th leaves increased, while the transpiration rate of the leaf, and the identical degree of heading decreased. Higher photosynthetic rate and water use efficiency were observed in the 9th and 10th leaves under low transplanting density. In the SRI experiments, the highest grain yield was attained at the transplanting density of 1 65×10 5 hills/ha.

关 键 词：水分利用率 水稻 穗分化期 稻穗 叶片光合速率 移栽密度 强化栽培 下降 增加 产量 

分 类 号：S511[农业科学—作物学] S512