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去劣疏伐是提高种子园产量和品质的主要措施之一，而无性系再选择则 能科学地确定出疏伐对象。通过子代测定和对无性系开花结实及产种量的观测， 综合评定出优、中、劣无性系，从而制定出疏伐强度、疏伐时间等疏伐方案。同时，向其它油松基地推广评选出的油松优良无性系。
Degradation is one of the main measures to improve the yield and quality of seed orchard. Clonal re-selection can scientifically determine the target of thinning. Through progeny determination and clonal flowering and seed production observation, comprehensive evaluation of superior, middle and poor clones, to develop the thinning strength, thinning time and other thinning programs. At the same time, we promoted the excellent clones of Pinus tabulaeformis to other bases of Pinus tabulaeformis.