Effect of freeze-thaw and the root system on soil detachment capacity of
different soils
Abstract
Soil detachment is one of the most important processes of soil erosion,
as it is of great significance for the prevention and treatment of soil
erosion in areas subject to seasonal freeze-thaw. However, most previous
studies on the effect of freeze-thaw on soil detachment capacity (SDC)
of bare soil, little research on SDC under the effect of freeze-thaw and
the root system. This study investigated the effects of freeze-thaw and
the root system on soil detachment capacity through hydraulic flume
experiments to simulate the soil detachment process of two soil types,
sand soil and loessal soil, under four treatments, control, freeze-thaw,
root system and freeze-thaw + root system. And a prediction model was
developed to calculate SDC under the effect of freeze-thaw and the root
system. The results illustrated that the SDC of sand soil was higher
than that of loessal soil. The SDC of two soils was reduced and
increased by the root system and freeze-thaw, respectively, although the
former effect was significant (P < 0.05) whereas the latter
was not. The effect of freeze-thaw in combination with the root system
showed that the root system contributed the majority of SDC variability
(99.95%); therefore, inhibition of SDC by the root system played a
leading role. When comparing shear stress, unit energy of the water
carrying section and unit stream power, stream power was found to be the
hydraulic parameter that best predicted SDC (R2¬ > 0.84).
The inclusion of root weight significantly improve the accuracy of the
SDC prediction model developed by hydraulic parameters. A general model
based on stream power and root weight was developed to quantify SDC and
was shown to have a high SDC prediction accuracy for both soils treated
by freeze-thaw and the root system [NSE = 0.88,R2 = 0.90].