2H)之間存在較大的相關性(P<0.05).由于大黃屬植物在形態(tài)上存在很大的相似性,故以D2H作為預測大黃屬植物生物量的易測值其可靠程度高.;A mathematical modelling method was used to estimate the biomass of Rheum uninerve.Results showedthat the dry weight of root,root tuber and leaf of R.uninerve were relative to the product (D2H)of length ofrhizome(H)and square of the diameter at the base of rhizome(D2)(P<0. 05).It was supposed that D2H couldbe used to estimate other plant biomass of genus of R.L.."/>