Effects of river sediment as the main substrate on the growth and physiological indexes of Agrostis stolonifera 'PENN A-4'
[Objective]The dredging sediment from rivers,lakes,reservoirs and ponds can be used for the production of high-economic value landscape plants such as turf,which can not only solve the problem of occupying cultivated farmland and destroying top soil layer,but also solve the treatment and disposal problem of organic solid waste such as sediment.[Method]Based on the mixed material design and the principle of maximum consumption of river sediment,the proportion of the three raw materials,namely sediment,biogas residue,and biochar,was set to be 50％≤ sediment≤ 100％,0≤ biogas residue ≤50％,and 0 ≤biochar ≤ 10％,respectively,totaling 13 treatments.Meanwhile,cultivated soil was set as the control,and the growth indicators(biomass dry mass,chlorophyll,root activity)and physiological indicators(soluble sugar,malondialdehyde,antioxidant protective enzymes)were measured to explore the feasibility and suitability of planting Agrostis stolonifera'PENN A-4'with the substrate of river sediment as the main material instead of the traditional cultivated soil.[Result]Compared with the control,the dry weight of above ground part and underground part of A.stolonifera'PENN A-4'significantly increased by 58.53％and 17.19％,respectively(P＜0.05)and the root activity nearly doubled(P＜0.01)when the proportion of sediment in the mixed substrate was 75.00％,the proportion of biogas residue was 20.00％,and the proportion of biochar was 5.00％,but the content of chlorophyll a and b in plants decreased by approximately 20.00％(P＜0.01).In addition,the mixed substrate significantly increased superoxide dismutase activity(28.66％,P＜0.01),but had no significant effect on the contents of soluble sugar and malondialdehyde,catalase activity and peroxidase activity in plants.[Conclusion]It is feasible to use river sediment as the main material,mixed with an appropriate proportion of biogas residue and biochar as a substrate instead of cultivated soil for A.stolonifera'PENN A-4'planting.The mixed biogas residue can effectively increase the aboveground biomass and root vitality of the turf grass,while biochar can effectively increase the underground biomass of the grass.[Ch,5 fig.4 tab.25 ref.]
river sedimentAgrostis stolonifera'PENN A-4'turf substratephysiological indexesbiomass
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