rhtyrophleum fordii is a rare species listed in China Plant Red Book.A survey about its geological distribution,habitat specificity and local population size was done and a long term monitoring was done for the population dynamics,size structure and natural regeneration in its nature community in Dinghushan Biophere Reserve.And a study about its growth in different ecological habitats was done.The results showed that this species became a rare species owing to both natural and artificial causes.Excessive ...