我们于1964年在广东省韶关专署金坑公社金坑大队狮公坑生产队的横冲西北坡的杉木人工林进行了调查。该杉木林于1956年春营造。坡度约20度,沙质壤土,土质肥厚。该林分是用实生苗和插条苗营造的。实生苗是在4月下旬小满栽植,插条苗是在3月份插植的。全垦林地,林农间作,杉桐混交,株行距为4×4市尺。我们选择立地条件基本相同,而又紧靠在一起的 In 1964, we conducted a survey on Chinese fir plantation on the northwesterly slope of the northwestern slope of Shigong pit production team at Jin Hang Brigade, Jin Hang Commune, Shaoguan Agency of Guangdong Province. The fir forest was built in the spring of 1956. Slope of about 20 degrees, sandy loam, soil hypertrophy. The stand is made of seedlings and cuttings. Seedlings are planted in late April, cuttings are planted in March. All the Kenwood, forest farms, fir mixed, line spacing of 4 × 4 feet. We choose the same site conditions, and close together