Effect of biochar and river sand on water-salt distribution and wheat growth in saline soils
[Objective]This study was to investigate the impact of biochar and river sand on the en-hancement of saline soils in the Yellow River Delta region.[Method]A field experiment was conducted to analyze the spatial and temporal transport of soil water and salt,as well as the growth and yield of winter wheat in saline soils under the influence of biochar and river sand.The experiment consisted of seven treat-ments:CK(control),S1(136 t/(hm2·a)of river sand),S2(272 t/(hm2·a)of river sand),S3(408 t/(hm2·a)of river sand),C1(5 t/(hm2·a)of biochar),C2(10 t/(hm2·a)of biochar)and C3(20 t/(hm2·a)of biochar).[Result]Our results showed that treatment C2 exhibited an average soil moisture content of 15.13%in the 0～20 cm soil layer,while treatment S3 displayed values of 17.35%and 20.53%in the 20～40 and 40～60 cm soil layers,respectively.Both biochar and river sand treatments can affect the distribution of soil mois-ture.Biochar primarily increased the water content in the surface soil,while river sand was more effective in increasing water content in the deeper soil layers.Concerning soil salinity,the application of biochar initially increased soil salinity,but it subsequently decreased after the revitalization stage.The average soil salinity was lowest in treatments S3 within the 0～20 and 20～40 cm soil layers,and lowest in treatment C2 within the 40～60 cm soil layer.Analyzing the change in salinity of winter wheat from the early fertility stage to harvest,the treatments with the highest reduction in the 0～20,20～40 and 40～60 cm soil layers were S2(32.34%),C2(29.86%)and C1(12.38%),respectively.However,the river sand treatment resulted in salt accumulation in the 40～60 cm soil layer.The growth and yield of winter wheat indicated that both biochar and river sand promoted its growth and yield,with biochar being more effective in promoting the initial growth.Treatment C2 yielded the highest winter wheat yield at 5 815.4 kg/hm2,which was 20.46%higher than the control(CK),while treatment S3 yielded 5 795.1 kg/hm2,both significantly higher than CK.[Conclusion]In conclusion,this study found that C2 treatment was the most effective,followed by S3 treat-ment,in enhancing saline soils.Therefore,the selection of an appropriate improvement method should be based on local conditions.
biocharriver sandsaline soilsoil water contentsoil salinitywinter wheat
NETL
NSTL
万方数据
