The high intrapopulation variation and low interpopulation differentiation could explained that the different populations might originate from the same one and genetic drift or inbreeding depression had not influenced primary process of genetic diversity.

• 四合木种群较高的遗传多样性和极低的种群间分化 ,说明不同的种群可能有共同的起源 ,随机遗传漂变和近交衰退不是影响遗传多样性的主要过程。