摘要
在大田条件下,采用人工改变株型的方法,比较了原型（平展型）与改型（紧凑型）玉米不同密度的群体光合速率,结果表明,改型群体光合速率比原型平均提高17.2％,籽粒产量增加5.3％～8.6％。抽丝期群体光合速率和籽粒产量之间呈极显著的正相关（r=0.8692）。改型玉米群体内光合有效辐射、CO_2浓度分布比原型相对的“均匀”,是群体光合速率较高的重要原因,认为玉米作物的优化群体结构为紧凑型玉米个体所组成的合理群体。
Experiments were conducted in 1993 and 1994 to study the effect of plant-type on canopy photosynthesis under field conditions. A chamber made of aluminum frame covered with plastic film was used to estimate canopy CO2- exchange rates over a land area of 1. 33 m2. Plant-type of maize 'Shendan 7' [planophile type, original-type (OT)] was artificially changed to erectophile type [altered-type (AT)] at silking stage. The rates of canopy apparent photosynthesis (CAP) were measured in both types of maize grown at five plant densities during the reproductive phase. It was shown that AT canopies had greater rates (about 17.2%) of CAP than OT canopies did and the yield increased by about 5. 3%~8. 6% in AT canopies. Grain yield was positively correlated with CAP rates (R2=0. 756). The vertical distribution of photosynthetic photon flux density and CO2 concentration in AT canopies were more uniform than those in OT ones. It was suggested that the compact architectures of maize canopy were excellent in photosynthesis processes and yield formation.
出处
《作物学报》
CAS
CSCD
北大核心
1996年第2期223-227,共5页
Acta Agronomica Sinica
基金
国家攀登计划课题
关键词
玉米
株型
群体光合
光合速率
产量
Maize (Zea mays L.)
Plant-type
Canopy apparent photosynthesis
Yield
