Study on Population Structure of Cycas parvulus in Dinosaur River Nature Reserve

The biotope and population structure of Cycas parvulus in Lishejiang watershed of Dinosaur River Nature Reserve Area in Yunnan Province was surveyed The results showed that 925% of the C parvulus plants grew on the shady bank of Lishe River under the deciduous seasonal forest at an elevation between 1100m and 1400m The population density of C parvulus was about 11 plants per 100m2 The age structure of C parvulus population showed to be in pyramid shape, in which the proportion of Ⅱage class was the largest, accounting for 3294% of the total Resulting from human disturbance, the number of the plants older than Ⅳ age class only counted for 2157% of the total At present, the C parvulus population is mainly endangered by human gathering and biotope destruction It was proposed to reinforce conservation measures in order to protect the C parvulus resource scientifically and rationally