赖草、羊草表型性状和根茎扩繁性状比较研究OA

Leymus secalinus and Leymus chinensis are important rhizomatous grasses used in ecological restoration and forage production in the grasslands of northern China.Due to the"three low"(low seed set-ting rate,low germination rate,and low grass productivity)problems associated with their sexual reproduc-tion,their asexual reproductive capacity is particularly vital for ecological protection.To systematically compare the rhizome expansion capacity of the two species,a common garden experiment was conducted in Youyu County,Shanxi Province,China.Using non-destructive measurement methods,the rhizome traits and expansion capacity of 50 Leymus secalinus and 10 Leymus chinensis germplasm accessions were evalu-ated,and both intraspecific and interspecific differences were analyzed.Results showed that:(1)The phe-notypic traits of Leymus secalinus and Leymus chinensis germplasms exhibited strong similarity.Among these traits,leaf-related characteristics exhibited small variation and remained stable across accessions.In contrast,traits such as rhizome-derived ramet number,stem length,plant height,heading characteristics,and tillering capacity displayed wide variation,indicating complex variation patterns.(2)Both species dem-onstrated strong rhizome expansion ability,with Leymus secalinus generally exhibiting stronger rhizome expansion capacity than Leymus chinensis.(3)The spatial expansion distance factor of rhizomes was identi-fied as the primary contributor to the rhizome expansion ability of both species.This study provides valu-able references and scientific support for the ecological restoration and adaptive management of grassland ecosystems centered on Leymus secalinus and Leymus chinensis.