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渝东地区地处重庆市东部的三峡地域,自然气候、土质条件等非常适宜油桐的生长,为我国油桐生长的最适生区、主产区及老产区.渝东桐油品质优良,各项桐油理化指标优于国家制定的标准,其中云阳桐油曾作为世界桐油检验标准,为出口的免检产品.然而,20世纪80年代末以后,由于桐油替代产品的出现,以及桐油新的利用途径尚未有效开发,渝东油桐生产出现了大滑坡,桐树资源遭到严重破坏,幸存桐林则基本处于荒芜、半野生状态.本研究以渝东典型油桐品种及各品种曾经的优质桐林种植区现存桐林为实验对象,采集全熟桐果用于桐油品质分析,并与我国现行的桐油国家标准比较.结果表明在本实验范围内,渝东现存桐林桐油品质只能达到国家二级或三级标准,各品种品质均有所下降.可见,桐林长年荒芜,无人哺育,品质会逐渐下降,许多过去经过几十年选育的优良种植资源会逐渐消失.
East Chongqing is located in the eastern part of the Three Gorges area, natural climate, soil conditions are very suitable for the growth of tung oil for the growth of China’s tung oil growing area, the main producing areas and the old producing areas. East Yu Tung oil quality, The physical and chemical indicators of tung oil better than the national standards, of which tung oil as the tung oil world yung tung oil testing standards for export-free products.However, since the late 1980s, due to the emergence of alternative tung oil, tung oil and the new utilization Way has not yet been effectively developed, Yu Tung produced a large landslide, tung tree resources have been severely damaged, the survival of Tong Lin is basically in barren, semi-wild state.Taking the East Yu typical Tung oil varieties and varieties of high-quality Tonglin The existing Tonglin in the planting area was taken as the experimental object and the whole ripe Tongguo was collected for the analysis of the quality of tung oil and compared with the current national standard of tung oil in our country.The results showed that the quality of the existing Tonglung tung oil in the east of Chongqing could only reach the national second- Three standards, the quality of all varieties have declined.It can be seen, Tong Lin desolate for many years, no one nurturing, the quality will gradually decline, after many decades of breeding in the past good plantation The source will gradually disappear.