一、早熟品种的概念及其发展 南方早熟梨品种主要是指适应我国南方即长江流域及其以南地区省、市栽培的砂梨系,成熟期早或中早的栽培品种,该地区包括江苏、浙江、安徽、江西、湖北、湖南、四川、云南、贵州、福建、台湾、广东、广西、海南等省以及上海和重庆市。在自然条件下,由野生的砂梨演化而来的半栽培和栽培的地方品种,大都是长期适应于当地的自然地理条件,具有较强的适应性 First, the concept of early maturing varieties and its development South early maturing pear varieties mainly refers to adapt to the southern China that the Yangtze River and its southern provinces, municipalities pear sand cultivation, early or early mature varieties of cultivars, the region, including Jiangsu Zhejiang, Anhui, Jiangxi, Hubei, Hunan, Sichuan, Yunnan, Guizhou, Fujian, Taiwan, Guangdong, Guangxi and Hainan provinces as well as Shanghai and Chongqing. Under natural conditions, semi-cultivated and cultivated landraces, which have evolved from wild sand-pear cultivars, are mostly adapted to the local natural and geographical conditions for a long time and have strong adaptability