中国农业科学2013，Vol.46Issue(17)：3562-3570,9.DOI:10.3864/j.issn.0578-1752.2013.17.004
中国1950s到2000s玉米产量-密度关系的Meta分析
Meta-Analysis of the Relationship Between Maize Crop Yield and Plant Density from 1950s to 2000s in China
摘要
Abstract
[Objective] The objective of the study is to reveal the general characteristics of yield-density relationships of maize plant density experiments in China,and to evaluate the suitability of meta-analysis as a tool to study maize yield response to plant density.[Method] Based on requirements for meta-analysis,a collection of historical maize plant density experiments from 1950s to 2000s in China was built with some 1500 pairs of plant densities and their crop yields.All eligible data sets were subject to statistical analysis such as gradients,boundary curves and 2-D kernel density.[Result] Variation coefficient was 20.4％ for optimum density,33.65％ for the highest yield and 30.8％ for yield per plant under optimum density.Relative importance of yield components varied with combination zones of plant density and yield per plant.Upper boundary yields as a function of plant density followed the equation of Y=-0.0134x3+3.15x,within plant density range of [0.99,15.0] plant/m2.Upper boundary yields as two stage functions of yield per plant were that increased along Y1 =113.lx,then declined along Y2 =-69.84x+ 33.87 when yield per plant is larger than 0.185 kg.Plant density range within which there is the highest possibility for the yield of 15 mg·hm-2 fell in [7.0,9.7] plant/m2.The 90th quantile for yield loss percentage was 6.18％ due to 15％ offset from the optimal plant density,and the 90th quantile due to 1 plant/m2 offset was 0.88 t·hm-2.[Conclusion] Meta-analysis facilitates the distillation and abstraction of bulk data from maize yield-density experiments with multiple views,and it is applicable to other crop science areas.关键词
玉米/最适密度/Meta分析/梯度分析/核密度分析/边界线分析Key words
maize/ optimal density/ meta-analysis/ gradient analysis/ 2-D kernel density/ boundary curve引用本文复制引用
杨锦忠,陈明利,张洪生..中国1950s到2000s玉米产量-密度关系的Meta分析[J].中国农业科学,2013,46(17):3562-3570,9.基金项目
国家自然科学基金项目(31271658)、山东省泰山学者建设项目、山东省高校优秀科研创新团队建设项目 （31271658）
