云南松优树半同胞子代测定

用４６株云南松优树种子，以优树林分的一般林木种子、商品种子和扭松种子作对照，开展了子代测定，综合评选出优良家系１４个。测算出树高、胸径、材积、直纹株率、木纹理扭转度的遗传力分别为０，６３８１、０．７１９２、０．６６５７、０．７９１０、０．９５２４。用中选的优良家系（入选率３０％）估算遗传增益，材积生长量比亲代群体提高１０％以上，比商品种子子代提高２０％以上；直纹株率比亲代提高８１．１８％，比商品种子提高６４．２６％。云南松的早期选择可在３～５年生时进行。子代的材积生长与亲本无关。

The Half-sib Progeny Test of Superior Tree of Pinus yunnanensis

superior tree seeds of Pinus yunnanensis compared with the general treeseeds of superior stand,commodity seeds and the torsional pine tree seeds,which were car-ried out progeny test,the results were selection optimal l4 families.Estimation were carriedout tree height,diameter,volume,the straight grain tree percentage and hereditary capacityof strength of their wood grain.The early selection of Pinus yunnanenesis should be madeat the age of 3 5 years.