[Objective] The study aimed at exploring the relationship among the agronomic characters of B. juncea in western China, in order to provide scientific basis for the breeding of B. juncea in western China. [Method] 39 ...[Objective] The study aimed at exploring the relationship among the agronomic characters of B. juncea in western China, in order to provide scientific basis for the breeding of B. juncea in western China. [Method] 39 B. juncea materials from western China were used for the canonical correlation analysis, and canonical correlations between each pair of the four ecological character （containing 18 variables） were verified, including yield characters （5 variables）, caulis characters （6 variables）, branch characters （3 variables） and pod characters （3 variables）. [Result] Yield per plant of B. juncea in western China suffered a tremendous influence from effective pod number per plant while was not significantly affected by the total pod number per plant, seed number per pod and 1 000-seed weight; the most important character related with the yield character of B. juncea in western China was caulis character, followed by the branch character and pod character; yield characters, caulis characters, branch characters and pod characters of B. juncea in western China were closely correlated. [Conclusion] In order to improve the yield characters of B. juncea in western China, caulis characters should be focused on, followed by branch characters and pod characters; rapeseed varieties with high performance in total pod number per plant and effective pod number per plant should be chosen through the perspectives of effective branch number, plant height, pod number of main inflorescence, fruit stalk number of main inflorescence and other traits, while rapeseed varieties with high performance in seed number per pod and 1 000-seed weight should be chosen through the perspectives of beak length and other traits.展开更多
地区(重庆)生产总值GDP由三大产业增加值构成,第三产业主要包括交通运、输仓储和邮政业增加值、批发和零售业增加值、金融业增加值等因素。交通是经济发展的基础之一,完整的交通网落不仅有利于本地经济的整合,也有利于对外经济交往。研...地区(重庆)生产总值GDP由三大产业增加值构成,第三产业主要包括交通运、输仓储和邮政业增加值、批发和零售业增加值、金融业增加值等因素。交通是经济发展的基础之一,完整的交通网落不仅有利于本地经济的整合,也有利于对外经济交往。研究GDP与交通运输的相互发展关系,有利于在不同的经济阶段提出相应的交通运输政策来提升刺激经济。目的:拟用1995——2014年重庆GDP和各交通运输因素,进行变量分类提取有效因子,建立有效的多元回归模型。方法:采用主成分和因子分析方法对9个原始变量进行降维、信息提取及旋转整合成3个指标。随后利用最小二乘法建立关于重庆生产总值与3个交通指标的回归模型。结合典型性结果分析三个交通因素与三大产业的相关性。结果:通过主成分和因子分析提取三个公共因子代表9个原始变量,将新指标 f1、 f2 和 f3分别命名为交通规模、交通工具和交通结构。采用最小二乘法拟合方程为 y E f f f = ? + + + 1.02 06 0.90 0.38 0.17 1 2 3,R2 = 0.988,可知方程线性拟合效果好。结论:通过回归模型得出重庆生产总值与交通运输各指标呈正相关,即在不同的经济阶段交通运输与经济的关系是相互作用的。在3个指标中规模对经济影响最大,因此可通过适当调节交通规模来提升经济。展开更多
基金Supported by National Natural Science Foundation(30760122)National High-Tech Research and Development Program(863Program)(2009AA101105)+1 种基金Faculty Construction of 211 Project(SZTD-211-02)Project of Introducing Advanced Agricultural Science and Technology of Ministry of Agriculture(948Program)(2010-Z54)~~
文摘[Objective] The study aimed at exploring the relationship among the agronomic characters of B. juncea in western China, in order to provide scientific basis for the breeding of B. juncea in western China. [Method] 39 B. juncea materials from western China were used for the canonical correlation analysis, and canonical correlations between each pair of the four ecological character （containing 18 variables） were verified, including yield characters （5 variables）, caulis characters （6 variables）, branch characters （3 variables） and pod characters （3 variables）. [Result] Yield per plant of B. juncea in western China suffered a tremendous influence from effective pod number per plant while was not significantly affected by the total pod number per plant, seed number per pod and 1 000-seed weight; the most important character related with the yield character of B. juncea in western China was caulis character, followed by the branch character and pod character; yield characters, caulis characters, branch characters and pod characters of B. juncea in western China were closely correlated. [Conclusion] In order to improve the yield characters of B. juncea in western China, caulis characters should be focused on, followed by branch characters and pod characters; rapeseed varieties with high performance in total pod number per plant and effective pod number per plant should be chosen through the perspectives of effective branch number, plant height, pod number of main inflorescence, fruit stalk number of main inflorescence and other traits, while rapeseed varieties with high performance in seed number per pod and 1 000-seed weight should be chosen through the perspectives of beak length and other traits.
文摘地区(重庆)生产总值GDP由三大产业增加值构成,第三产业主要包括交通运、输仓储和邮政业增加值、批发和零售业增加值、金融业增加值等因素。交通是经济发展的基础之一,完整的交通网落不仅有利于本地经济的整合,也有利于对外经济交往。研究GDP与交通运输的相互发展关系,有利于在不同的经济阶段提出相应的交通运输政策来提升刺激经济。目的:拟用1995——2014年重庆GDP和各交通运输因素,进行变量分类提取有效因子,建立有效的多元回归模型。方法:采用主成分和因子分析方法对9个原始变量进行降维、信息提取及旋转整合成3个指标。随后利用最小二乘法建立关于重庆生产总值与3个交通指标的回归模型。结合典型性结果分析三个交通因素与三大产业的相关性。结果:通过主成分和因子分析提取三个公共因子代表9个原始变量,将新指标 f1、 f2 和 f3分别命名为交通规模、交通工具和交通结构。采用最小二乘法拟合方程为 y E f f f = ? + + + 1.02 06 0.90 0.38 0.17 1 2 3,R2 = 0.988,可知方程线性拟合效果好。结论:通过回归模型得出重庆生产总值与交通运输各指标呈正相关,即在不同的经济阶段交通运输与经济的关系是相互作用的。在3个指标中规模对经济影响最大,因此可通过适当调节交通规模来提升经济。
