| The research objects of this paper were Pinus Tableulaeformis(PT)forest,Robinia pseudoacacia(RP)forest and Malus domestica(MD)plantation in the Loess Plateau.In the study,the Water Scout SM 100 Sensor-6ft moisture probe was used to observe the dynamic soil moisture content of different soil layers.The samples were taken to determine the physical and chemical properties of the soil,analyzed the root pulling data output by the WS-5921/U60104 data acquisition instrument,and calculated the root mechanical characteristics.Finally,the Green-Ampt infiltration model was used in the study,and the ABAQUS 6.14 software was used to combine the Mohr-Coulomb theory and the strength reduction method.The modeling analysis was based on the stability of different forest slopes under the coupling of hydrology and mechanics.The results :(1)There were significant differences in the soil moisture content of the observed forest lands.The soil moisture content of MD forests was generally higher than that of RP forest and PT forest;the overall soil infiltration characteristics between different forest lands were: initial infiltration rate>average infiltration rate> steady infiltration rate;the seasonal changes of soil water storage tended to be consistent,and the overall trend was to increase first and then decrease.(2)Through path analysis,the most influential factor in soil physical and chemical properties was0.050?0.002 mm soil particle content,its decision coefficient was 9.825,density had a greater indirect effect on it,path analysis was suitablele for soil moisture influencing factors analysis.(3)The F-S fitting curve of single root pull-out force and root soil relative displacement of PT was consistent,and the piecewise fitting was a linear function positive correlation and a power function negative correlation.Single root diameter,embedment depth,loading speed,soil moisture content and soil dry density had significant effects on the distribution of F-S fitting curve.In some possible cases,the F-S fitting curve of the single root pulling experiment of the PT forest land could be approximated to analyze the single root pulling characteristics of the RP forest land.(4)In the analysis of different forest slope models establelished by ABAQUS 6.14,the stability safety factors of different forest lands was: RP> PT> MD.The stability of MD forest land was relatively lower than that of PT forest and RP forest.(5)Rainfall infiltration had a significant impact on the slope stability of artificial forests.Under long-term continuous rainfall conditions,the degree of soil infiltration was high.The slope infiltration depth of short-term high-intensity rainfall was lower than that of long-term low-intensity rainfall.Both rainfall intensity and duration were negatively correlated with the slope stability coefficient.The research results can provide references for rural economic development,selective use of land resources,and improvement of afforestation technologies in the Loess Plateau. |
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