德保苏铁扶平居群与“回归项目”居群的调查

德保苏铁是我国特有种,为更好地了解其回归项目人工居群状况,为其今后的发展制定规划,2012年对其个体进行生长特性调查。（1）调查德保苏铁扶平居群结构,并绘制其分布图。将此次调查数据与2001年马晓燕等调查的数据对比,发现植株数量由2001年的785株下降致2012年的425株。扶平居群年龄结构呈倒金字塔型,扶平居群极度濒危,亟需有效保护。（2）调查扶平居群和黄连山居群（即＂回归自然项目＂居群）植株的形态指标并进行比较,人工居群的有茎干植株比、植株叶数均值都优于扶平居群的,说明德保苏铁回归自然项目已取得初步成功。

The investigation of Cycas debaoensis in Fuping population and Reintroduction Program population

Cycas debaoensis is a special cycas variety in China.In order to understand better artificial population in Reintroduction Program,work out a developmental plan,a survey on growth characters of individual cycas was conducted in 2012.（i） The population structure of Cycas debaoensis Y.C.Zhong et C.R.Chen in Fuping was investigated,and the distribution map has been drawn.The result of the investigation was compared with investigation result of Ma Xiao-yan in 2001,the number of individuals had decreased from 785 in 2001 to 425 in 2012.The age structure of Fuping population is inverted pyramid indicated the population is critically endangered,the effective protection is needed eagerly.（ii） The morphological index of Cycas debaoensis in Fuping and Huanglianshan population（Reintroduction Program population） were investigated and compared,the results showed that the percentage of plants with trunk and the average of leave number in man-made population were higher than Fuping population.This is the symbol of preliminary success in the Reintroduction Program of Cycas debaoensis.