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[1]LIU Xu,BAI Yiru,MA Xian.Effects of PAM on Soil Water Movement and Hydraulic Parameters of Urban Green Spaces in Yinchuan[J].Research of Soil and Water Conservation,2023,30(03):217-224.[doi:10.13869/j.cnki.rswc.2023.03.013]

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Effects of PAM on Soil Water Movement and Hydraulic Parameters of Urban Green Spaces in Yinchuan

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 217-224 Column: Public date: 2023-04-10

Title:: Effects of PAM on Soil Water Movement and Hydraulic Parameters of Urban Green Spaces in Yinchuan

Author(s):: LIU Xu^1,2, BAI Yiru¹, MA Xian^1,2; (1.School of Geography and Planning, Ningxia University, Yinchuan 750021, China; 2.Breeding Base for State Key Lab. of Land Degradation and Ecological Restoration in Northwestern China, Ningxia University, Yinchuan 750021, China)

Keywords:: urban green space soil; PAM; water movement; hydraulic parameters

CLC:: S152

DOI:: 10.13869/j.cnki.rswc.2023.03.013

Abstract:: [Objective]This study explored soil water movement and hydraulic parameters of urban green space with different PAM application ratios to provide theoretical reference for building urban green space and utilizing water resources. [Methods] The soil of urban green space in Yinchuan was taken as the research sample. The vertical one-dimensional soil column test was adopted, 5 PAM addition rates of 0%(CK), 0.02%(T₁), 0.04%(T₂), 0.06%(T₃), 0.08%(T₄), 0.1%(T₅)were added to urban green space soil of Yinchuan. The process of wetting front, cumulative infiltration amount, and infiltration rate were studied. The applicability of the Philip model, Horton model, Kostiakov model and general empirical formula in the soil moisture infiltration process of Yinchuan urban green space containing PAM was comparedt. The effect of PAM application on soil hydraulic parameters was analyzed. [Results] Compared with CK, the wet front processes of T₁, T₂, T₃, T₄, and T₅ treatments decreased by 5.2%, 12.0%, 13.2%, 15.4% and 24.2%, respectively, and the cumulative infiltration amount reduced by 5.9%, 12.8%, 14.7%, 21.4% and 31.5%, respectively, when the infiltration lasted 300 minutes. Compared with CK, T₁, T₂, T₃, T₄, and T₅ reduced the stable infiltration rate by 10.1%, 22.4%, 23.3%, 29.2% and 41.6%, respectively. The comprehensive comparison results indicated that the simulated accuracies of the four infiltration models decreased in the order: Horton>Kostiakov>Philip>General Empirical Model. The retained water content θ_r, saturated water content θ_s and shape coefficient n increased with the increase of PAM application rate, while the reciprocal α of intake suction and saturated hydraulic conductivity K_s decreased with the increase of PAM application rate. [Conclusion] The addition of PAM can effectively remedy the phenomenon of deep soil leakage and poor water retention in Yinchuan urban green land.

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Last Update: 2023-04-10