• 研究报告 •

### 长白山濒危植物牛皮杜鹃（Rhododendron chrysanthum）种群数量特征与动态分析

1. (长白山科学研究院， 长白山生物群落与生物多样性吉林省联合重点实验室， 吉林延边 133613)
• 出版日期:2017-11-10 发布日期:2017-11-10

### Quantitative characteristics and dynamic analysis of the endangered species Rhododendron chrysanthum population in Changbai Mountain.

JIN Hui, ZHAO Ying, YIN Hang*, QIN Li-wu, LIU Li-jie, WANG Chao, JIA Xiang, LI Bing-yan

1. (Jilin Provincial Joint Key Laboratory of Changbai Mountain Biocoenosis and Biodiversity, Changbaishan Academy of Science, Yanbian 133613, Jilin, China).
• Online:2017-11-10 Published:2017-11-10

Abstract: Rhododendron chrysanthum is listed as one of the national protected plants at third category in Chinese Plant Red Book. Its population size is very small, being on the verge of extinction. Based on the methods of population static life table, survival curve, and individual amount dynamic prediction, the quantitative characteristics and dynamic trend of R. chrysanthum population at different altitudes of alpine tundra in Changbai Mountain were studied. The results were as follows: (1) The spindleshaped size class structure suggested that R. chrysanthum population exhibited a declined pattern. (2) The growth potential of population decreased gradually with the rising altitude. Under incomplete random disturbance, the growth potential of the population was limited, and the Vpi″ of low altitude was close to 0. (3) The survival curve of population exhibited as the DeeveyⅢ type, which had higher death rate and lethal force with obvious degradation at the higher altitude. (4) After 1, 2, and 4 age classes, the individual number at age class 4 would increase to varying degree. The individual number was supplemented in the later growth stage. (5) The population size of R. chrysanthum was maintained mainly by ramets reproducing from reptant roots. The possible factors leading to the species being endangered might be its biological characteristics and the disturbances from human activities.