野生和栽培滇龙胆草生物量分配及异速生长

Biomass allocation and allometry of wild and cultivated Gentiana rigescens Franch. ex Hemsl. (Gentianaceae)

植物地上-地下生物量分配反映了植物的生长策略。草本植物地上-地下生物量是否是等速生长还有争论。养分和密度会影响药用植物地上-地下生物量的分配。本研究比较了野生和栽培滇龙胆草地上-地下生物量分配的差异,分析了栽培年限和密度对栽培滇龙胆草生物量分配的影响。结果表明,野生与栽培滇龙胆草地上-地下生物量分配存在显著差异(P<0.05),可能与土壤营养水平和竞争强度有关,但地下生物量和地上生物量为近等速生长关系。密度、密度与生长年限的交互作用均对地下生物量有显著影响(P<0.05)。滇龙胆草栽培时需控制密度并研究施肥和土壤微生物等因素对其药用部位产量(地下生物量)的影响。

Above-and below-ground biomass allocation has implications for plant growth strate- gies.It is not clear whether below-ground biomass of herbaceous plants isometrically scales with above-ground biomass or not.Both nutrients and individual density may affect the biomass alloca- tion in medicinal plants.Here,we compared the differences of above-and below-ground biomass allocation between wild and cultivated C,entiana rigescens Franch.ex Hemsl.and analyzed the effects of cultivation duration and individual density on the biomass allocation of cultivated indi- viduals.We found significant differences (P<0.05)in the allocation between the wild and culti- vated plants,which might be influenced by soil nutrient level and plant competition.However, below-ground biomass isometrically scaled with above-ground biomass for both wild and cultivated plants.Density and its interaction with cultivation duration had significant effects on below-ground biomass (P<0.05).Further studies are needed to optimize the density and to clarify the effects of factors such as fertilization and soil microbes on the yield of medicinal use part (below-ground biomass)of this species.