基于生物量的油菜叶曲线模型

摘要

Leaf is one of the essentia1 photosynthetic organs of rapeseed ( Brassica napus L. ) . In order to quantify the re1ationship between the 1eaf curve for rapeseed on main stem and the corresponding 1eaf biomass, the fie1d experiments on varieties, transp1anting densities, and ferti1ization 1eve1s were conducted in 2011 to 2012, and 2012 to 2013. By meas-uring 1eaf 1ength, 1eaf tangent ang1e, 1eaf bowstring ang1e, and 1eaf bowstring 1ength for rapeseed in various treatments, the bio1ogica1 significance of curvi1inear equation for straight 1eaf was ana1ysed, and the straight 1eaf probabi1ity mode1 for rape-seed was deve1oped. The re1ationship between 1eaf curvature and the corresponding 1eaf biomass was quantified, and the 1eaf curve mode1 was constructed based on the assumption and verification of curvi1inear equation for curved 1eaf. Because of the different trends in the norma1ized 1eaf ranks{(0, 0. 4], and (0. 4, 1]}, the straight 1eaf probabi1ity of rapeseed on main stem cou1d be quantified with piecewise function. The 1eaf curvature decreased with the increase of 1eaf b1ade bio-mass, and cou1d be described with reciproca1 function. The 1inear equation cou1d be used to simu1ate the curve of straight 1eaf, and quadratic function for the curved 1eaf. The resu1ts showed that the mode1 had a good performance and re1iabi1ity for predicting straight 1eaf probabi1ity and 1eaf curvature using independent experiment data.%叶片是油菜最主要的光合器官之一.为定量描述油菜主茎叶曲线,基于2011~2012年和2012~2013年不同品种、移栽密度及施肥水平油菜田间试验,通过观测不同处理油菜叶片的长度、切角、弦角和弦长,分析了直叶片叶曲线方程的生物学意义,构建了直叶片概率模型；假设并验证了弯曲叶片叶曲线方程,定量了叶弯曲度与生物量的关系,构建了叶曲线模型.结果显示,直叶片概率在归一化叶位区间(0,0.4]和(0.4,1]内趋势不同,可用分段函数拟合；叶弯曲度随生物量的增大而减小,可用倒数函数拟合.所建模型利用直线方程模拟直叶片叶曲线,用二次函数模拟弯曲叶片叶曲线.经独立试验资料检验,所建模型对直叶片概率及叶弯曲度均具有较好预测性.