摘要
通过不同种植密度对"紧凑型"品种超试1号的群体光合生理性能及产量性状进行研究。结果表明,在6.75～9.75万株/hm2密度范围内,随着种植密度的增加,群体叶面积指数(LAI)显著增大,光合势(LAD)增加,冠层的光合有效辐射(PAR)的截获率增大,但叶片叶绿素相对含量(SPAD)降低和比叶重(SLW)下降;在灌浆期穗位叶PSⅡ反应中心光化学淬灭系数(qP)和非光化学淬灭系数(qN)随密度的增加而提高,但在高密度(D3)条件下PSⅡ光合量子产量(EQY)降低和电子传递速率(ETR)较低,表明其光能转化效率降低,而单株干物质积累速率随密度的增加则呈现降低趋势;但在群体干物质积累量(QDMC)表现为升高趋势,产量随密度的加大而提高,但同时导致每穗粒数和千粒重下降。
This study was conducted for the purpose in detecting the effects of different plant densities on photosynthetic-physiological characters and yield traits of the ＂compact-type＂ maize variety Chaoshi No. 1 grown in spring season on a super-high yielding paddy field. The results showed that in the range of plant densities from 67 500 - 97 500 plants/ha, with increasing of plant density, population leaf area index （LAI） , leaf area duration （LAD） , and capture efficiency of photo-synthetically active radiation （PAR）of canopy increased correspondingly; the relative chlorophyll content （SPAD） and spicel leaf weight （SLW） decreased on the contrary ; and the photochemical quenching （qP） and non-photo-chemical quenching （qN） of ear-nod leaf at grain filling stage increased, too. Under high plant density （ D3 ） condition, the effective quantum yield （EQY） of ear-nod leaf and the electron transport rate （ETR）showed low,indicating slow-down of the sunlight energy transformation efficiency ; the speed of dry matter accumulation（DMC） of a single plant decreased, but the population DMC and grain yield increased ; the grain No. per ear and 1000-grain weight decreased.
出处
《华北农学报》
CSCD
北大核心
2011年第5期174-180,共7页
Acta Agriculturae Boreali-Sinica
基金
国家"十一五"科技支撑计划(2006BAD02A13-4)
关键词
种植密度
春玉米
产量性状
光合生理特性
Plant density
Spring maize
Yield characters
Photo-physiological character
