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龙枣(Zizyphus jujuba cv.),鼠李科枣属,系大枣的变种。龙枣为阳性树种,性耐寒冷干旱及瘠薄,忌水涝。因枝条扭曲盘旋生长,似虬龙而得名,属优良园林绿化材料。龙枣在塞北宣化尚无露地栽培经验,故从1991年开始我对龙枣进行了嫁接引种试验。宣化气候寒冷,年平均气温7.6℃,一月平均最低气温-16.8℃。春季干旱,降雨量仅为370.2毫米,故植物易干梢。因此,嫁接和越冬是引种的两个关键问题。一、嫁接以乡土树种酸枣为砧木,1991年进行了劈接,1994年进行了插皮接。
Zizyphus jujuba cv., Rhamnaceae jujube, is a variety of jujube. Jujube is a positive tree species, cold and drought resistance and barren, avoid waterlogging. Due to twisting and twisting growth of branches, like the dragon dragon named, is an excellent landscaping materials. Longzuo Xuanhua in northern Salar de novo cultivation experience, so I started from 1991 on the date of the introduction of grafted test. Xuanhua climate is cold, with an average annual temperature of 7.6 ℃, January average minimum temperature of -16.8 ℃. Spring drought, rainfall is only 370.2 millimeters, so the plant easy to dry tip. Therefore, grafting and overwintering are two key issues introduced. First, the grafting of native trees jujube rootstocks, split in 1991, in 1994, the cutaneous access.