中条山林局浮山林场于1973年秋天,在油松人工幼林的基础上,改建母树林100亩。为了了解六年来母树林的生长发育情况和结实规律性,我们结合平时观察,于1979年7—8月份进行了一次调查,现根据调查的初步结果,归纳几个问题,分述于后。一、母树林改建概况(一)立地条件母树林所在地海拔1400米,坡度平缓,土壤为碳酸盐褐土,中壤质,PH 值6.5,土层厚度40—60厘米,年降水量500毫米左右,无霜期160—180天。 Zhong Shan Forestry Bureau Fushan Forest Farm in the autumn of 1973, based on the artificial pine forest, rebuilt 100 acres of mother woods. In order to understand the growth and development of parent woods in the past six years and their strong regularities, we conducted a survey in July-August 1979 in conjunction with usual observations. We now summarize several issues based on the preliminary findings of the investigation. I. Overview of the Regeneration of the Mother Tree (I) Site Conditions The mother tree forest is located at an altitude of 1400 meters above sea level with gentle slope. The soil is carbonate cinnamon soil, medium loamy soil, PH 6.5, soil thickness 40-60 cm and annual precipitation 500 mm About frost-free period 160-180 days.