云南松母树林后代苗期生长变异的初步研究

A Preliminary Study on Seedling Stage Growth Variation of Subsequent Generation of Seed Stand of Pinus yunnanensis

对云南松母树林后代（５个种源８１个家系）苗期生长的分期观测及研究结果表明：云南松苗期生长可分为４个时期，即火柴柱形期（Ⅰ期）、灯笼形期（Ⅱ期）、伞形前期（Ⅲ期）和伞形后期（Ⅳ期）；苗木营养器官的生长发育只有一定的阶段性；种子的大小及发芽率与苗木的生长关系不明显；苗木大多数性状在家系内差异不明显，在家系间和种源间则存在显著的差异；苗期以滇东南和川西南种源的生长量和生物量较大，滇中和滇西种源次之，对照的最小。

According to the stage observation and study on subsequent generation of Pinusyunnanensis(5 provenances,81 families)about seedling stage growth.The results showed thatthe seedling stage growth of Pinus yunnanensis may be devided into 4 stages:①splint formstage(stageⅠ),②lantern form stage(stage Ⅱ),③umbrella form stage(stageⅢ),④fixplanting earlier stage(stage Ⅳ).The growth and development of each vegetative organ onseedlings have certain stage,The relation between size,gemlination percentage of seed andgrowth of seedling is not obvious,the difference on most seedling characters is not significantin the families,but it is significant between families and provenances.The growth andbiomass of provenances in the southeast of Yunnan and southwest of Sichuan are large,thatof the provenancesin the middle and west of Yunnan is the second and that of the compari-son is the smallest.