Effect of Seedling Raising Methods on Leaf Photosynthesis and Grain Yield of Mechanically-transplanted Japonica Rice  

不同机插育秧方式对水稻光合特性及产量的影响（英文）

作　　者：赵轶鹏[1] 王友霜[1] 吴玉玲[1] 胡婷婷[1] 王健康[1] 丁成伟[1] 郭荣良[1] 徐家安[1] 

机构地区：[1]江苏徐淮地区徐州农业科学研究所,江苏徐州221000

出　　处：《Agricultural Science & Technology》2017年第11期2057-2061,2063,共6页农业科学与技术（英文版）

基　　金：Supported by Jiangsu Provincial Science and Technology Demonstration Project(BE2015312);National Rice Industry Technical System(CARS-01-59)~~

摘　　要：This study was conducted to investigate the effects of seedling raising modes on photosynthetic charactedsticsand grain yield under wheat straw returning. Four representative cultivars in Huaibei area were selected as test materials. By setting potted seedlings and carpet seedlings, the effects of different nursery meth- ods on the photosynthesis of rice at different growth stages in Huaibei area were investigated. Compared with carpet seedlings, the leaf area index of potted seedlings decreased at the maturation stage, but the dry weight of leaf shewed no significant difference.The SPAD of potted seedlings had an increasing trend after transplanting, but the SPAD increased differently according to cultivars. The net photosynthetic rate, stomatal conductance and transpiration rate of the leaves of pot seeding rice were significantly higher than those of carpet seedling rice on the 85^th d after transplanting. However, theintracellular CO2 concentration and water use efficiency of leaves had no significant differences between different ＇treatments. The results indicate that the photosynthetic capacity of flag leaves of pot seedling rice is stronger in early and middle stages, but the decay rate of photosynthetic function is slightly faster than carpet seedling rice, which might be the main reason for the rice yield of potted seedlings having no remarkable difference from carpet seedlings.以本地区4个主栽品种为试验材料,设置钵苗和毯苗两种育秧方式,研究不同机插育秧方式对秸秆还田水稻光合生产和产量的影响。与毯苗育秧方式比较,钵苗育秧使成熟期水稻叶面积指数下降,移栽后各期钵苗育秧水稻叶片的SPAD有增加趋势,增幅因品种而异;钵苗育秧移栽后85d剑叶的净光合速率、气孔导度、蒸腾速率均明显高于毯苗育秧水稻,但各处理间的叶片胞间CO_2浓度和水分利用效率差异不大;移栽后100 d钵苗育秧水稻叶片净光合速率则普遍呈现下降趋势。以上结果表明,钵苗育秧水稻生殖生长前、中期剑叶光合能力较强,但由于钵苗育秧水稻光合功能衰退速度略快于毯苗育秧水稻,可能是导致处理间最终稻米产量并无明显差异的主要原因。

关 键 词：Seedling raising method Mechanically transplanting Leaf photosynthesis Grain yield 

分 类 号：S511[农业科学—作物学]