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选用优良林分建立母树林,是实现林木良种化的一条重要途径。我们于1973年7月结合教学,进行林分踏查和标准地调查,协助耀县柳林林场从现有人工林中建立油松幼龄母树林346.5亩。其中马家梁工区化塔作业区331亩,蔡家庄工区献头原作业区11.5亩。化塔作业区母树林在工区西向约2华里处,地势平缓开阔,坡向为北偏西—北—北偏东,坡度一般在15°左右。土壤系碳酸盐褐土,深厚,肥沃。油松幼林为1962年春单株
The use of good stands to establish a parent forest is an important way to achieve forest seed improvement. In July 1973, we engaged in teaching to carry out surveys of forest stands and standard surveys to assist Liusun Forest Farm in Yao County to establish 346.5 mu of young pine trees from existing plantations. Among them, 331 mu of tower work area of Majialiang work area and 11.5 mu of former work area of Caijiazhuang work area are offered. The towering work area mother trees in the work area west about 2 miles, flat and open, slope northwest west - north - north east, the slope is generally about 15 °. Department of carbonate soil cinnamon soil, deep and fertile. Pinus tabulaeformis was a single plant in the spring of 1962