干旱地区农业研究2017，Vol.35Issue(5)：1-7,34,8.DOI:10.7606/j.issn.1000-7601.2017.05.01
冬小麦叶片形状系数的变异性
Variations of leaf shape coefficients of winter wheat
摘要
Abstract
In this study,the temporal and spatial variations of α values of winter wheat had been investigated through a field experiment conducted from October 2014 to June 2015.A total of six wheat cultivars (varieties) (two early ripening,two medium ripening,and two late ripening) were involved.The whole growth season of wheat was divided into six different stages,i.e.emergence,greening,jointing,heading,flowering and maturity.Wheat plants were randomly collected and all leaves were cut off and measured for their length,width,and area with a digital leaf area scanner.Then,α values were calculated for each leaf.The variations of α values were analyzed for different growth stages,among different wheat cultivars,and among different leaves of a single plant.The results showed that α value ranged from 0.59 to 0.71 and varied at different growth stages.It increased with fluctuations from emergence to flowering stage,and then decreased.The uncertainties of α values,measured by standard deviation and coefficient of variation,decreased first and then increased slightly.Within a single plant,α values varied at different stages but remained relatively stable at flowering stage.The uncertainty of α value increased after flowering.Among different wheat cultivars of various ripening traits,α values were significantly different at jointing,heading and flowering stages,but not significantly different at emergence,greening and maturity stages.Thus,it is better to adopt various α values at different growth stages so as to improve the accuracy of simulation and prediction of leaf area of winter wheat.Based on linear regression analysis of leaf area and product of leaf length and width of 1 485 leaf samples of six different wheat cultivars,the general value of α was about 0.66.Then,when simulating wheat leaf areas with the model of LA =0.66 × L × W,the relative root mean square error (RRMSE) and absolute relative error (ARE) were 4.40％ and 13.05％,respectively.The accuracy was the highest among the five different models investigated for estimation of wheat leaf area.Thus,this model was recommended for the estimation of wheat leaf area and leaf area index in future field studies.关键词
冬小麦/叶面积/形状系数/叶长/叶宽/变异性Key words
winter wheat/leaf area/leaf shape coefficient/leaf length/leaf width/variation分类
农业科技引用本文复制引用
周元刚,姚宁,冯浩,白江平,张体彬,何建强..冬小麦叶片形状系数的变异性[J].干旱地区农业研究,2017,35(5):1-7,34,8.基金项目
国家高技术研究发展计划(863计划)(2013AA102904) （863计划）
国家自然科学基金(51209176) （51209176）
高等学校学科创新引智计划(B12007) （B12007）
