核桃有伤流为人所共知。但对其在一个年周期里的变化规律以及对核桃的生长发育有什么影响却不十分清楚。为摸清核桃伤流的规律性,我们从1973年以来连续进行了观察,并作了伤流对修剪和嫁接影响的试验,取得一些观察资料,现将其整理供作参考。一、材料和方法(一)试材:试验在本所核桃园进行,以成年的早实核桃和晚实核桃以及2—4年生的实生核桃砧木为试材。试材地位于眉县东部的 Walnut wounds are well known. However, it is not clear how the changes will affect the growth and development of walnut in one year cycle. To find out the regularity of the injury of walnut, we have conducted continuous observations since 1973 and made some experiments on the effects of wounding on pruning and grafting. We have obtained some observation materials and are organized for reference. Materials and methods (a) test material: the test carried out in our walnut orchard, the early mature walnut and late mature walnut and walnut rootstock 2-4 years old as the test material. The test material is located in the eastern Meixian