不同轻型基质对杉木容器苗生长与养分积累的影响OA北大核心CSTPCD

In order to screen out the light medium formula suitable for the growth of superior clone of Yang-061 container seedlings of Cunninghamia lanceolata,the effects of different light substrates,such as peat soil,perlite,C.lanceolata bark and rice husk and their ratios on the growth,root morphology and nutrient accumulation of C.lanceolata with yellow soil used as the control(CK)were studied by using simplex cen-troid mixture design.The results showed that 1)compared with CK,the seedling height,ground diameter,biomass and seedling quality index showed the same growth rhythm in different light substrate formula,namely the growth increased with time.2)After 360 days of cultivation,the seedling height,ground diame-ter and seedling quality under different light substrate treatments were all higher than CK.Among them,the seedling height was the highest in T5 and T6 treatments,which increased by 54.41％and 54.89％re-spectively compared with CK.The ground diameter and seedling quality index reached the maximum value in T6 and T1 treatments,which were 33.04％and 48.65％,higher than CK,the biomass achieved its max-imum in T14.3)Different light substrate treatments effectively promoted the root development of C.lan-ceolata seedlings,and the total root length,root surface area,root diameter and root volume reached their maximum values in T2,T14,T9 and T14 treatments,respectively.4)The response of nutrient content of C.lanceolata seedlings to different light substrates was different among treatments.The light substrates of T5,T3 and T12 treatments significantly promoted the accumulation of nitrogen in plant,the light sub-strates of T8,T3,T13 significantly increased the total phosphorus content of seedlings,while the T8,T9 and T2 treatments significantly increased the total potassium content of seedlings.(5)The comprehensive-ly analysis results analyzed by the subordinate function value method showed the top three light substrate suitable for the growth of C.lanceolata were T14(20％peat soil+27％perlite+27％C.lanceolata bark+26％rice husk),T6(60％peat soil+40％perlite)and T1(100％peat soil).Considering the high cost of peat soil,T5 and T14 treatments were selected as light substrates suitable for the growth of C.lanceola-ta Yang-061 container seedlings in this study.