摘要
在超高产栽培条件下,对多穗型小麦品种豫麦49的冠层光辐射特征进行了研究.结果表明,豫麦49叶面积指数 LAI 全生育期变化为单峰曲线,由越冬期开始逐渐增大,于开花期达最大值,之后下降.开花后D2 基本苗为150×104株/hm2 处理绿叶面积保持时间较长.其叶片分布 LD 处理间存在显著差异,但以D2处理的LD较为合理.各时期处理间平均叶倾角 MFIA 均为高密度的大于低密度的,返青以前不同处理间的差异较小,拔节以后差异增大,灌浆后期各处理MFIA均有减小趋势.消光系数 K 随天顶角增大而增大,D2处理冠层消光系数适中,且分配较优.冠层直射辐射透过系数 TR 随天顶角增大逐渐减小,开花期各处理之间差异显著,灌浆中期各处理之间差异减小.D2处理因其产量三因素协调而产量显著高于其它处理.综合以上结果可知,豫麦49在超高产条件下以D2处理的冠层结构最优,表现为LAI大小适中,叶片分布均匀,冠层消光系数分布合理,光能利用率较高.
Under superhighyielding condition,the character of light radiation in canopy of Yumai 49 had been studied.The results showed that the leaf area index (LAI) of Yumai 49 behaved as a singlepeaked curve and the peak value reached at anthesis.With the increasing of density,the LAI enhanced before anthesis.D2 (150×104 basement plants per hm2) treatment had longer green leaf area duration after anthesis.The leaf distribution (LD) of the D2 were more reasonable than that of the others.With the plant growing,the mean foliage inclination angle (MFIA) increased gradually.The higher density treatments had higher MFIA than the lower density treatments.There existed less difference of MFIA among all the treatments before reviving and more difference at postjointing.The extinction coefficient (K) enlarged with increasing of zenith angle.D2 had a reasonable canopy architecture than others,which accounted for they had intercepted more solar radiation.The transmission coefficient for radiation penetration (TR) at anthesis and middlefilling stage declined with increasing of zenith angle.There were significant difference among all the treatments at anthesis,but less difference at middlefilling stage.The grain yield characteristics of all treatments were different.When the planting density increased,the kernels of per united area increased.But there were opposite facts in kernel and kernels weight.The grain yield of D2 treatment was higher than that of other treatments significant or extremely significant.
出处
《西北植物学报》
CAS
CSCD
2003年第10期1657-1662,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家重点基础研究发展规划 (G2000077900)
国家 "十五"重大专项部分研究 (2001ba507a02 )
关键词
小麦
密度
冠层结构
产量
wheat
density
canopy structure
yield
