中西部4个省市三年桐留存资源性状特点对比分析

为了明确三年桐Vernicia fordii 历史上几个生产区留存资源特点，为今后油桐产业资源培育提供方向与选择，以收集的云南、湖南、贵州及重庆现存三年桐资源果实、种子为研究对象，对其大小、质量、果实出籽率、含油率以及折光指数各性状指标进行分析对比，得到目前几个省现存资源特点：果实、种子大小及其质量平均值大小依次为贵州省＞云南省＞湖南省＞重庆市；云南省资源丰富度大，留存资源相对完整；各省现存资源含油率较以前降低；湖南省留存三年桐油折光指数相对比较高；云南省资源平均出籽率相对较高；各省果实与种子形状、种仁含油率以及油折光指数是弱变异，果实和种子风干质量、果实所含种子粒数属强变异。

Comparative analysis on characteristics of three-year retained resources of Paulownia in four provinces and cities in central and Western China

In order to clarify the characteristics of the retained resources in several production areas in the history of Vernicia fordii for three years, and to provide the direction and choice for the cultivation of the industrial resources of tung tree in the future, the collected fruits and seeds of the existing three-year Tung resources in Yunnan, Hunan, Guizhou and Chongqing were taken as the research objects. The size, quality, seed yield, oil content and refractive index of the fruits were analyzed and compared, and the characteristics of the existing resources in several provinces were obtained: fruits The seed size and the average value of seed quality were Guizhou Province > Yunnan Province > Hunan Province > Chongqing city; Yunnan Province is rich in resources, and the retained resources are relatively complete; The oil content of existing resources in each province is lower than before; The refractive index of tung oil retained in Hunan Province for three years is relatively high; The average seed yield of Yunnan resources is relatively high; The shape of fruit and seed, oil content of seed kernel and oil refractive index in each province were weak variation, while the air drying quality of fruit and seed and the number of seeds in fruit were strong variation.