淹水胁迫对不同种源池杉幼苗生物量与根系形态的影响OA

To clarify the response characteristics of biomass and root morphology of Taxodium distichum var.Imbricarium seedlings from different provenances to flooded environments,seedlings of T.distichum var.imbricarium from three prove-nances were used as research materials.Different flooding depths were set to study the effects of flooding stress on the bio-mass and root morphological characteristics of seedlings from different provenances.Meanwhile,principal component analy-sis and membership function analysis were adopted to comprehensively evaluate the flooding tolerance of T.distichum var.imbricarium from different provenances.The results showed that with increasing flooding depth,the plant height,ground di-ameter,root biomass,stem biomass,leaf biomass,total root length,root surface area,and root tip number of T.distichum var.imbricarium from different provenances generally showed a trend of first increasing and then decreasing.For specific root length and specific root surface area,the Anji(Zhejiang Province)provenance showed a trend of first decreasing and then increasing;the Pingxiang(Guangxi Zhuang Autonomous Region)provenance showed an overall decreasing trend;and the Fenyi(Jiangxi Province)provenance had no significant change.Comprehensive evaluation by principal component analysis and membership function analysis indicated that the flooding tolerance of seedlings from the three provenances ranked as follows:Guangxi Pingxiang>Jiangxi Fenyi>Zhejiang Anji.T.distichum var.imbricarium grew well under mild flooding con-ditions,but severe flooding stress would inhibit its growth.The responses of biomass and root systems to flooding stress var-ied among different provenances,and the Pingxiang(Guangxi Zhuang Autonomous Region)provenance had strong flooding tolerance.