The morphology of mature male cones was observed and the impact of climate was studied.The collecting days of mature pollen at Chun’an County,Zhejiang Province,was during the 3-5-days period from the end of Mach to t...The morphology of mature male cones was observed and the impact of climate was studied.The collecting days of mature pollen at Chun’an County,Zhejiang Province,was during the 3-5-days period from the end of Mach to the beginning of April in normal temperature years,which would be 3-5 days later in low temperature years and 3-5 days earlier in high temperature years.The male cones at lower elevation blossom 6-8 days earlier than those at the elevation of 120-550 m.Therefore,it is practical to prolong reasonably the collecting period of pollen.展开更多
文摘The morphology of mature male cones was observed and the impact of climate was studied.The collecting days of mature pollen at Chun’an County,Zhejiang Province,was during the 3-5-days period from the end of Mach to the beginning of April in normal temperature years,which would be 3-5 days later in low temperature years and 3-5 days earlier in high temperature years.The male cones at lower elevation blossom 6-8 days earlier than those at the elevation of 120-550 m.Therefore,it is practical to prolong reasonably the collecting period of pollen.
