关键词: 东北地区, 茶藨子属, 物种多样性, 分布格局

Abstract:

The Northeastern region of China is one of the important distribution areas of wild Ribes， and many records of the genus in this region are incomplete or even incorrect. There is an urgent need to summarize the species and distribution of the wild Ribes in this region. Field investigation on the wild Ribes in northeast China was conducted， and the Flora of China， the northeast plants search contents， and the Northeast vascular plants survey were consulted， and related papers and electronic documents and websites were reviewed respectively. The results showed that there were six subgenus and 22 species（including eight varieties） of the wild Ribes in northeast China. Heilongjiang Province had the largest number of wild Ribes， with 12 species and two varieties， Jilin Province had eight species and four varieties， Liaoning Province had five species and four varieties， and the eastern part of Inner Mongolia Autonomous Region had seven species and two varieties. The wild Ribes in the northeast China mainly distributed in the Greater Khingan Mountains， the Lesser Khingan Mountains， the Changbai Mountains， and the coast and islands of the Liaodong Peninsula； the number of species and subgenus of this genus in the northeast China was consistent in horizontal distribution. The wild Ribes in the Lesser Khingan Mountains had the largest number of species and subgenera， and was the modern distribution center of the wild Ribes in northeast China. The Ribes in the northern part of the northeast was dominated by hermaphroditic groups， while in the southern part of the Northeast Most of them were unisexual groups. This genus was distributed from low altitude（≤200 m） to high altitude（1 800-2 100 m）， and most species were concentrated at an altitude of 300-800 m. The endemic phenomenon of this genus was very obvious. There were as many as 15 species（including six variants） endemic to domestic regions， accounting for 68%. The wild Ribes in northeast China had many species， rich resources， wide distribution and huge development potential. However， its living environment was under threat. We should pay close attention to the dynamic changes of its population and distribution area in order to take measures to protect it in time.

Key words: northeast region, Ribes, species diversity, distribution pattern