甘蔗不同叶位叶片形态与冠层特征的关系

利用CI-100数字植物冠层分析仪和CI-203叶面积分析仪测定了4个甘蔗品种不同叶位层的冠层参数和相应叶位叶片的形态特征，结果表明：不同基因型不同叶位层问叶片形态、冠层空间结构和冠层辐射特征存在显著差异，不同叶位层叶面积指数、叶簇倾角和叶分布的变化主要由冠层内不同叶位叶片叶宽的变化引起，而不同叶位层消光系数的变化主要与叶簇倾角和叶分布有关；散射光透过系数的变化主要与叶面积指数、叶簇倾角和叶分布有关，直射光透过系数的变化主要与叶分布、叶宽、长宽比有关，光合有效辐射的变化与叶面积指数、叶面积、叶宽、长宽比有关．研究结果同时表明，叶片形态与冠层辐射特征存在显著的典型相关关系．图2表4参15。

RELATIONSHIP BETWEEN CANOPY CHARACTERS AND LEAF MORPHOLOGY AT DIFFERENT POSITIONS OF SUGARCANE

The canopy structure and leaf morphological characters of 4 sugarcane genotypes at different leaf layers on seedling were studied by using CI-100 plant canopy instrument and CI-203 area meter instrument. The results showed the leaf morphological parameters, canopy structure and radiation transmission at different leaf layers were notably different among different genotypes. The variation of I la(leaf area index), A mfi(mean leaf angle degree), D l(leaf distribution) at different leaf layers were mainly caused by the leaf width at relevant position. The variation of K at different leaf layers was related to A mfi and D l. The variation of T d(transm. coef. for diffuse penetration)had significant correlations with I la, A mfi and D l. The variation of T r(transm. coef. for radiation penetration)had significant correlations with D l, leaf width and the ratio of leaf length to width. The variation of P ar had significant correlations with I la, leaf area, leaf width and the ratio of leaf length to width. Leaf morpho logy showed significant typical correlation with the canopy radiation transmission. Fig 2, Tab 4, Ref 15