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A Study on Life Table of Chinese fir Cones

Chen Meixiang (Beijing Forestry and Pomology Institute, Beijing 100093)  
Based on the data collected in 1995 and 1996, the time specific life tables of Chinese fir cones were established Nine factors involved to kill Chinese fir cones are missing of cones, mechanical damage, injury by Dichomeris bimaculatus, Gonocerus longicornis, Sinorsillus pilfers, and other pests, disease, seed abortion, and other factors Among them, damage by Dichomeris bimaculatus and seed abortion are the primary mortality induced factors
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