Cone and seed yield of 16 populations of Pinus tecunumanii at 5 sites inZimbabwe

摘要

Cone and seed yield of 160 families from 16 populations (10 families per population) of Pinus tecunumanii were assessed in eight- and nine-year old provenance/progeny tests located at five sites ranging in altitude from 700 m to 1700 m a.s.l. Eight of the 16 Fl tecunumanii populations came from an altitudinal range of above 1500 m a.s.l. (high elevation population group) while the other eight were from below 1500 m a.s.l. (low elevation population group). P. patula and P. oocarpa, a high and low elevation species respectively, were also included in the test as controls.