Difference in root configurations of different combinations of alfalfa and three different life-type perennial grasses after mixed sowing
[Objective]The experiment is carried out in order to explore the response of root configuration of le-gume-grass mixed pasture to mixed sowing components and proportions.[Method]The artificial pasture constructed by alfalfa and three life forms gramineous forage(stolon type-Poa pratensis,rhizome type-Bromus inermis and bush type-Festuca arundinacea)with mixed sowing ratios of 7∶3,5∶5 and 3∶7 was selected as the research objects,and the monoculture of each forage was chosen as the control to determine the root morphology and configuration characteris-tics of each component under different mixed sowing treatments.[Result]Mixed sowing changed the morphology and configuration of forages roots.The forages responded to the competitive environment by increasing the total root length,root surface area,root volume and root tip number,reducing root diameter,optimizing topological structure,enhancing spatial occupancy and improving root development.As a result,the mixed sowing pasture yield increased.However,the exorbitant proportion of alfalfa would hinder the growth of F.arundinacea roots.Compared with the monoculture pasture,the root branch structure of forage in the mixed pasture had the trend of changing from fork branch to fishtail branch.Under the mixed sowing treatment,the variation of root traits of each grass species was obvi-ous.The variation of alfalfa was mainly in the number of root tips,and the coefficient of variation was 51.95%.The variation of P.patensis was mainly in the topological index,and the coefficient of variation was 81.13%.The varia-tion of B.inermis and F.arundinacea was mainly in root volume,and the coefficient of variation was 52.29%and 29.17%respectively.[Conclusion]When alfalfa was mixed with P.pratensis at 3∶7,with B.inermis at 3∶7,and with F.arundinaceaat 3∶7,the root system developed and the rate of increases were high..
mixed sowingalfalfaperennial gramineous foragelife formsroot morphology and configuration
万方数据
维普
