Pop ulation Structure and Dynamics of Woody Liana Kadsura coccinea
For the population structure and dynamics of Kadsura coccinea, we used the typical sample-plot survey, diameter structure instead of age structure and variance/mean ratio to study the age , height structure and the spatial distribution of three populations in Fengshuilin National Natural Reserve , Daweishan National Natural Reserve and Wuliangshan National Natural Reserve , respectively .We established the time-specific life table and drew the survival rate curve .The relative age structure of three populations was an inverted pyramid shape , which was divided into five classes .There were almost no saplings in Class I , and more adult trees in the age structure for three populations .The adult trees accounted for 60%-80%, which showed that these populations belonged to declining populations .The height structures of three populations were in different classes , but they were successive in the height growth of their individuals and in community .The distribu-tion patterns of three populations were different .The pattern of Fengshuilin population was characterized by a clump distri-bution, and those of Daweishan and Wuliangshan populations were characterized by random distribution .By the time-spe-cific life table, the development process of K.c occinea population could be divided into three stages including sapling stage, mature tree stage and old tree stage .The survival curves of three populations were close to Deevey I with the mean-ing of declining tendency , which suggested that the weaker regeneration capacity and the less population amount limited the survival and breed of K. coccinea and led to it endangered .It is an important work to enhance protecting , introduction and domestication of K.cocic nea.
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