Result from observation of sex reversal phenomenon of Pinus tabulaeformis microstrobilus shows that: differentiated normal microstrobilus had a phenomenon of sex reversal,which changed to megastrobilus gradually from the top to the base,until the entire into unusual megastrobilus;the unusual megastrobilus had a ability to accept pollen,and developed into fascicled small cone on the branches.

The strobilus development and the fruiting status,and their relationships with various ecological factors were examined by using the method of standard branches.

Observation of sex reversal phenomenon of Pinus tabulaeformis microstrobilus;

The respitatory intensity, which of microstrobilus in the male sterile scion, increased, but that of its leaves decreased; and that of microstrobilus in fertile stock come down, but that of its leaves is raised.

TIs authors have investigated the respiratory intensity Of microstrobilus and leaves by combbing male sterile plant with male fertile plant in Cunning hamia lanceolata (Lamb.