title: [Age estimation and age structure of Cycas fairylakea population in Shenzhen City].
abstract: Based on the structural characteristics of Cycas trunk, including vegetative leaf base scars, sporophyll concave rings, and average occurrence probabilities of vegetative leaf and sporophyll, a method for the age estimation of Cycas fairylakea population was developed, and the age of each individual was calculated. Three approaches, i.e., age structure diagram, age distribution curve and curve estimation were used to study the age structure of C. fairylakea population at genet and clone population levels. The age structure diagram showed that the clone population of C. fairylakea was stable, but the genet population was in declining. However, both of the clone and genet populations were in declining when using the other two approaches. It was considered that the C. fairylakea population was in declining, and needed an urgent protection.
authors.affiliation: College of Life Science and Technology, Xiaogan University, Xiaogan 432003, Hubei, China. wangdp@scbg.ac.cn
authors.forename: Dian-Pei
authors.initials: DP
authors.lastname: Wang
authors.forename: Shu-Yi
authors.initials: SY
authors.lastname: Ji
authors.forename: Fei-Peng
authors.initials: FP
authors.lastname: Chen
authors.forename: Shao-Lin
authors.initials: SL
authors.lastname: Peng
mesh_terms: D002681:China; D003247:Conservation of Natural Resources; D029784:Cycas / Q000033:anatomy & histology* / Q000254:growth & development*; D004463:Ecology; D018547:Plant Stems / Q000033:anatomy & histology*; D011157:Population Dynamics; D013997:Time Factors