【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。更多还原

【Abstract】 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 photo-chemical 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.更多还原