The Adaptation Of Clonal Component And Root Of Potentilla Supina Under Different Restoration Years In Marsh Wetland

The self-adjustment and adaptation of plant functional traits play an important role in the habitat stress that alleviates the heterogeneity of resource distribution and the contradiction between supply and demand of photosynthetic products in plant life history.It is meaningful to reveal ecological suitability of clonal plant based on availability of resources,way of resource utilization and phenotypic plasticity of clonal plant that created by water level to research clonal architecture in the marsh wetland.Potentilla supina is a typical wetland clonal plant and a pioneer in the restoration of wetland,The study on the clonal configuration pattern of P supina helps to understand the clonal plants in heterogeneous habitats.Adaptation mechanism and strategy and the contribution of P.supina populations to community stability during wetland restoration succession provide a theoretical basis for further understanding of the ecological adaptability of clonal plant populations in wetlands.was perennial emerged plant and persistent root herbs.The study site was located in Yongchang Beihaizi National Wetland Park.Gansu Province,China.Survey and sampling were carried out at 24 plots which were set up along the restorative succession periods of the plots,Plot?(5a)?plot?(15a)?plot?(25a)and plot?.Community traits were investigated and thirty clone sequences of P.supina were collected randomly at each plot to measure the spacer diameter,spacer length,branching intensity of P.supina in laboratory,and clonal architecture was calculated by Random Walking Model,the relationships between spacer length and diameter,ramet number,the role of root in the process of clone architecture construction were analyzed by SMA and biological characteristics.The results show that:(1)There were significant differences in wetland vegetation community characteristics and soil characteristics during wetland restoration succession.With the restoration of wetland succession,the height,density and coverage of wetland vegetation communities increased,biomass accumulation,community structure changed,and community dominant species From P.supina to Lolium Loinn;soil water content,organic matter,hydrolyzable nitrogen and available phosphorus generally increased gradually,soil bulk density gradually decreased,proportion of fine clay,coarse clay and fine sand in soil gradually,the proportion of fine powder and coarse powder in the soil gradually increased,indicating that as the wetland resumes succession,the soil nutrients increase,the water storage capacity increases,but the permeability deteriorates.The community characteristics and soil characteristics of thewetland vegetation in the plot ? were close to the plot IV,indicating that the restoration degree of the wetland community in the plot ? was close to the original plot;(2)There were significant differences in the clonal components of P.supina during the restoration of wetland(P < 0.05).With the restoration of wetland succession,the height of base plants,biomass of basal plants,height of ramets,biomass of ramets,length of spacers and diameter of spacers increased gradually,and the number of leaves,number of ramets and number of stalks increased.The gradual decrease;the length,diameter and number of rams showed strong plasticity;there was a significant negative correlation between the length and diameter of the spacer and the number of ramets(P < 0.05).It indicated that short and fine spacers and more ramets were selected in the plot I,and long and thick spacers and fewer ramets were selected in plot ? to achieve efficient use of limited resources.(3)The clonal architecture of P.supina was transition-type in the Plot?,phalanx-type in the plot?,and guerrilla-type in the plot? and plot?.(4)The distribution pattern and fractal structure of root specific length of P.supina during wetland restoration succession were significantly different(P < 0.05).With the succession of wetland restoration,the root length and specific root length of P.supina increased gradually,root biomass decreased gradually,and root length and biomass showed a significant negative correlation(P < 0.05);Root fractal dimension increased gradually,root fractal abundance decreased gradually,and root fractal dimension and fractal abundance showed a significant negative correlation(P < 0.05),root architecture from "diffusion" type turn to "intensive".It reflects that P.supina adapts to heterogeneous habitats through root plasticity adjustment..As a typical wetland clonal plant,P supina has strong phenotypic plasticity.Through the clonal configuration and plasticity adjustment of components,it can continuously adapt to the complex environment in the process of restoration and succession of marsh wetland.Through the analysis of wetland vegetation community characteristics and soil characteristics,the plot I is the ideal growing area of P.supina.As the wetland resumes succession,P.supina gradually loses its advantages and faces strong survival pressure.In the plot I adopted a development strategy of maintaining a certain population density and monopolizing regional resources,and adopting a migration strategy of enduring or escaping unfavorable habitats in the plot ?.The applicability adjustment of clonal building blocks,configuration and rootcharacteristics reflects the special regulation mechanism and survival strategy of wetland clonal plants under special habitat conditions.