垫状锦鸡儿的繁殖方式及其在适应干旱荒漠环境中的生态意义

Propagation of Caragana tibetica and its ecological role in adaptation to arid desert environment

研究内蒙古荒漠区锦鸡儿属优势种垫状锦鸡儿灌丛结构、分株特征、繁殖倾向和克隆生长特性.结果表明:在荒漠区,垫状锦鸡儿的营养繁殖占主导地位,有性繁殖为辅;其营养繁殖由枝条克隆产生无性系分株,克隆生长构型为密集型.较高的无性繁殖比例、密集型的克隆构型和发达的根系使垫状锦鸡儿能很好地适应荒漠区的干旱环境,并成为荒漠区的优势种.

In order to understand the reproductive characteristics of Caragana tibetica in the desert areas and reveal its mechanism of adaptation to environment,the shrub structure,ramet characteristics,breeding tendency and clonal growth characteristics of C.tibetica clusters in the Alshan desert region of the Inner Mongolia Plateau were studied.The results showed that clonal propagation of C.tibetica was the dominant way in the arid desert region,and C.tibetica reproduced ramets mainly by branches covered by sand and had a clonal architecture of ＂phalanx＂.C.tibetica was well adapted to the arid environment of desert region by the higher proportion of asexual reproduction,phalanx clonal architecture and well-developed root systems,which made it be one of the dominant species in the desert region.