论文部分内容阅读
山楂(Crataegus pinnatifida)是蔷薇科的落叶果树,在北方各省山区都有种植。山楂抗寒抗旱,生长旺盛,适应性强。山西省晋城县陈沟公社乔岭大队有一株山楂,株高8.4米,树冠东西13.4米,南北13.6米,胸围2.16米。根据观察,这棵树的大枝已有4次更新,现在树皮完整,树心不空,老而不衰,枝叶茂盛,年产果实都在千斤以上。果树科学工作者认为,这棵山楂树树龄约有300多年,是已知栽培山楂树中的最大者。这株山楂树对研究山楂的生长发育周期、生长与
Crataegus pinnatifida is a deciduous fruit tree of the Rosaceae, planted in the mountainous regions of the northern provinces. Hawthorn cold drought, vigorous growth, adaptability. There is a hawthorn in Qiaoling Brigade of Chengou Commune, Jincheng County, Shanxi Province, with a plant height of 8.4 meters, a crown of 13.4 meters, a north-south 13.6 meters and a chest of 2.16 meters. According to observation, the tree has four major branches updated, and now the tree bark integrity, the tree heart is not empty, old but not bad, lush foliage, with an annual output of more than a kilogram of fruit. Fruit tree scientists believe that this tree hawthorn tree about 300 years old, is the largest known hawthorn cultivation. This plant hawthorn to study the growth and development of hawthorn, growth and