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| Study on population structure and dynamicsof Cephalotaxus oliveri Mast. |
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| Abstract: |
| In order to better understand the population structure and dynamics of Cephalotaxus oliveriMast.，a rare medicinal plant，the age and height structures and the spatial distribution of its population wereanalyzed，the time-specific life table was established and the survivership curve was drawn with the data ofthe survey of 12 sample plots in Xinping county of Yunnan province. The results indicated that the relative agestructure was complete and its histogram looked like a spindle while the numbers of seedlings and adult treeswere too less. These showed that the population was declining. The height structure was complete，indicatingthat the population was successive in the heightgrowth of its individuals and in community. Its spatialdistribution pattern was of clump and those of theⅢ-class and Ⅳ-class populations became of poisson.Its development could be divided into 4 phasesincluding seedling，young，adult and old phases. Itsmortality rate was the highest in the seedling phaseand the lowest in the old phase. The survivershipcurve was close to the type of Deevey Ⅰ and thisrevealed that the population was declining. |
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