Effect of Algae Crusting Cover on Soil Structure Under Freeze-Thaw Conditions
[Objective]To investigate the effects of biological crustal cover and freeze-thaw on soil structure.[Methods]The effects of different freeze-thaw times,initial soil water content before freeze-thaw and biological crusting(algae crust)cover on soil structure characteristics was employed to analyze the indoor simulated freeze-thaw method.[Results](1)The soil structure index(IGss)obtained by orthogonal experiment was between 75.57～96.57,the signal-to-noise ratio(S/N)was between 37.55～39.70 dB,and the optimal factor combination ascertained by the Taguchi method was 15 freeze-thaw cycles,15％initial water content,and 80％algal crust coverage,and the predicted results were IGss=98.09,S/N=39.89 dB.(2)A positive correlation was observed between IGSSIGSS was positively correlated with freeze-thaw times,initial water content and algal crusting coverage,and the primary influences on the soil structure index were ranked as initial water content＞freeze-thaw times＞algal crusting coverage.The contribution rates of each factor to alterations in the soil structure index were initial water content(52.17％)＞freeze-thaw frequency(31.95％)＞algae crusting coverage(2.12％).(3)The change of soil structure index comes from the loss of soil water and pore expansion during the freeze-thaw process,and algae crusting can slow down the loss of water during the freeze-thaw process,thereby decelerating the IGSS alteration.[Conclusion]Orthogonal experiments in this research explored the effect of algae crusting cover on soil structure under freeze-thaw conditions,and the results could provide a theoretical reference for the study of soil freeze-thaw process under complex conditions.
the Loess Plateausoil structurefreeze-thaw simulationbiological crustTaguchi method
万方数据
维普
