茶树经济树龄长达50年左右,茶园一旦建成,品种更换很困难。由于红茶出口创汇等原因,茶树育成品种多为红茶品种或制红绿茶品质均不突出的中间类型品种,优质绿茶良种和优质红绿茶兼制型良种奇缺。上世纪八十年代以来,随着外销红茶跌落,而内销绿 The economic age of tea tree up to 50 years or so, once completed tea plantation, species change is difficult. Due to the export of black tea and other reasons, most of the cultivated varieties of tea are black varieties or red and green tea quality are not prominent intermediate types of varieties, high-quality green tea varieties and high-quality red and green tea and system-type lack of seeds. Since the eighties of last century, with the black tea exports fall, while the domestic sales of green