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为量化玉米果穗形状并明确逆境对其生长的影响,借助图像处理,用矩形度(E)、体积差(V)、纵向质心(L)、偏轴距(T)和球体度(S)分别表示矩形相似性、体积均等性、纵向及横向对称性和圆球相似性,对2种生长条件、2个玉米品种和2种去叶处理的试验结果进行聚类、典型变量和方差分析.结果表明:在吐丝后2周内形状变化明显,E(0.72~0.78)和S(0.40~0.48)上升,L(0.56~0.51)、T(0.02~0.01)和V(0.25~0.21)下降,以后各特征都趋于稳定.逆境(高种植密度,不施肥)使成熟期的E降低了4.5%,V扩大了17.7%,它们与穗长和穗粗结合,能够解释产量变化的87%~97%.纵观玉米果穗生长全过程,L、V和S3个形状参数对逆境较敏感,可作为逆境胁迫的量化指标.
In order to quantify the shape of ear of maize and clarify the effect of adversity on its growth, with the aid of image processing, with the square of (E), the volume difference (V), longitudinal centroid (L), eccentric wheelbase (T) Representing the similarity, volume uniformity, longitudinal and transverse symmetry and sphere similarity, clustering, canonical variances and analysis of variance were performed on the results of two growth conditions, two maize varieties and two de-leafing treatments. The results showed that the shape changes obviously after 2 weeks of silk spinning, the E (0.72-0.78) and S (0.40-0.48) rise, L (0.56-0.51), T (0.02-0.01) and V (0.25-0.21) Afterwards, all the characteristics tended to be stable. Adversity (high planting density and no fertilization) decreased E at maturity by 4.5% and V by 17.7%, and their combination with spike length and ear diameter could explain 87% 97% .Throughout the whole process of ear growth in maize, L, V and S3 shape parameters are more sensitive to adversity and can be used as quantitative indicators of stress.