集流渗灌条件下枸杞根系层土壤水分分布及有效降雨界限研究OA

To assess the feasibility of rainwater-harvesting infiltration irrigation(RHII)for wolfberry(Ly-cium barbarum L.)cultivation in arid regions,field experiments and theoretical analysis were conducted in the wolfberry cultivation area of Gangou Village,Yuanzhou District,Guyuan City,Ningxia Hui Auton-omous Region.The study focuses on the changes of soil moisture in the root layer and the effective rainfall limit of wolfberry under RHII.Results revealed that soil moisture redistribution exhibited pronounced spa-tial heterogeneity.Across all vertical profiles,soil moisture generally increased with depth;however,the rate of increase varied markedly.The steepest rise occurred at 50 cm depth in the L20-L60 profiles;whereas at the L80 profile,moisture at 50 cm depth showed minimal gain and even declined slightly over time.Overall,the magnitude of moisture increment decreased progressively from L20 to L80.The law of wetting front migration in the root layer of wolfberry was obviously affected by spatial changes,and the in-itial rate of wetting front migration in each horizontal profile increased with soil depth.Under RHII condi-tions,the average effective rainfall limit for wolfberry was 11.31 mm,which was affected insignificantly by rainfall intensity.These findings demonstrate that RHII is technically viable for wolfberry cultivation in water-scarce environments,which can serve as a rainwater supplementary irrigation scheme in arid re-gions,so as to mitigate water stress in arid and semi-arid agroecosystems.