The Effect Of Simulated Compound Management Of Yew And Ficus On The Growth Of Two Plants And The Accumulation Of Secondary Metabolites

Fig(F.carica)is a fast-growing small tree in the mulberry family F.carica,which has high ornamental value.Its fruit is edible,and its leaves contain active ingredients with antibacterial,antiviral,antitumor and hypoglycemic effects,and it is called "the patron saint of human health in the 21st century".Northeast yew(Taxus cuspidata S.et Z.)belongs to the genus Taxus of the Taxus family.It is category I of state special protected wild plant and recognized as the "panda" in plant world.The young T.cuspidata grows slowly and cannot tolerate strong light.T.cuspidata is interplanted with fast-growing tree species,which could shade the T.cuspidate for reducing the damage of strong sunlight to them.Considering the suitable area,light preference,growth rate and root depth of T.cuspidata and F.carica,it is speculated that F.carica may be a suitable mixed tree species of T.cuspidata.In order to verify this hypothesis,three composite management models of interplanting F.carica-T.cuspidata group,T.cuspidata single planting group and F.carica single planting group were set up,and pot planting experiments were used to preliminarily investigate the different planting modes of T.cuspidata-F.carica plantation.Plant growth and secondary metabolite accumulation.The differences in plant growth,photosynthesis,soil nutrients,soil microbial community structure,soil enzyme activity and main secondary metabolite content under different planting models were compared,with a view to providing a theoretical basis for formulating a high-efficiency interplanting management model of T.cuspidata.The main findings are as follows:The growth rate of T cuspidata planted in the interplanting T.cuspidata-F.carica group was 1.47 times higher than that of the single planting group,and the base diameter growth rate was 1.08 times that of the single planting group.m-2·s-1,exceeding the single planting group by 25.7%;in terms of light and pigment,the chlorophyll a,chlorophyll b,and total chlorophyll content were higher than the single planting group by 17.5%,16.1%,and 11.8%,respectively.In the T.cuspidata-F.carica composite planting model,the new-year volume of F.caricas was 32.2%higher than that of the single planting group;the maximum net photosynthetic rate of F.caricas was 11.9 μmol·m-2·s-1 which exceeded 5.2%of the single planting group;In terms of light and pigment,the contents of chlorophyll a,chlorophyll b and total chlorophyll were not significantly different from the single planting group.The seven soil enzyme activities in the interplanting T.cuspidata-F.carica group,namely soil enzyme sucrase activity,urease activity,acid phosphatase activity,polyphenol oxidase activity,protease activity,catalase activity and dehydrogenase activity are common Higher than two single planting groups.The content of organic carbon and organic nitrogen in the soil of the interplanting group was also higher than that of the two single planting groups.Both of these aspects indicate that the interplanting T.cuspidata-F.carica group improves soil fertility.The number of cultivable bacteria and culturable fungi in the soil under different planting patterns was significantly different,specifically as follows:In terms of the number of bacterial flora,the soil of the single planted F.carica group＞ the soil of the single planted T.cuspidata group soil＞ the soil of the interplanting.In terms of the number of fungal flora,the soil of the interplanting group＞ the soil of the single planting T.cuspidata group soil＞ the soil of the single planting F.carica group.This indicates that interplanting management increases the number of soil fungal flora and reduces the number of bacterial flora.The psoralen content in F.carica leaves was about 3.89mg/g in the interplanting T.cuspidata-F.carica group,while the single planting group was about 3.47mg/g.The taxol content in T.cuspidata leaves was about 98μg/g under the T.cuspidata-F.carica composite planting model,and the taxol content in T.cuspidata leaves was about 73 μg/g under the single planting model.In summary,this study proves that the combined planting of T.cuspidata and F.carica increases the number of soil fungal flora and the activity of various soil enzymes,and promotes the growth of two plants and the accumulation of primary secondary metabolites..The research results can provide a reference for the combined management of T.cuspidata-F.carica.