植物营养与肥料学报2012，Vol.18Issue(1)：27-34,8.
花后小麦叶面积指数与光合和产量关系的研究
Effects of leaf area index on photosynthesis and yield of winter wheat after anthesis
摘要
Abstract
Leaf is the main tissue of photosynthesis for green plant. Leaf area is closely correlated with the grain yield of crops. To make clear the effects of leaf area index on photosynthesis and yield of winter wheat after anthe- sis, and to provide a theoretical basis for winter wheat cultivation with high and stable grain yield, Tainongl8 （T18）, a winter wheat cultivar with multi-grain number per spike, and Shannongl5 （S15）, a winter wheat cuhi- var with middle grain number per spike, were used as experimental materials. The two cuhivars were both widely grown. Field trials were carried out from 2008 to 2010 in two successive growth seasons in a split plot design, with 2 nitrogen rates （ 180 kg/ha and 240 kg/ha of pure nitrogen） being in the main plot and 3 plant densities （0.75, 1.50 and 2.25 million basic seedlings per hectare） representing in the subplots. The results showed that lower leaf area index （ LLAI, the third leaves and the forth leaves under the flag leaves on the stems） is positively and signifi- cantly correlated with canopy apparent photosynthesis （CAP） and grain yields during the lower leaf stay-green stage, and the top leaf area index （TLAI, flag leaves, the first leaves and the second leaves under the flag leaves on the stems） and whole leaf area index （WLAI） which consists of all of the leaves on the stems are positively sig- nificantly correlated with CAP and grain yield for T18 but not for S15 so the relationships are not certain within 14 days after anthesis. TLAI and WLAI are positively and significantly correlated with CAP and grain yields for two kind of wheat from 14 days after anthesis to maturity. There is a significant interaction between nitrogen rate and plant density on grain yield. Being reducing nitrogen amount from 240 kg/ha to 180 kg/ha of pure nitrogen, both T18 which adopts 2.25 million basic seedlings per hectare and S15 which adopts 1.50 million basic seedlings perhectare could gain high grain yields.关键词
冬小麦/氮肥水平/种植密度/冠层/光合/产量Key words
winter wheat/nitrogen rate/plant density/canopy/photosynthesis/grain yield分类
农业科技引用本文复制引用
王成雨,代兴龙,石玉华,曹倩,门洪文,贺明荣..花后小麦叶面积指数与光合和产量关系的研究[J].植物营养与肥料学报,2012,18(1):27-34,8.基金项目
国家重点基础研究发展计划项目(2009CB118602) （2009CB118602）
公益性行业(农业)科研专项(201103030)资助. （农业）
