Soil crust is formed on many soils of the Loess Plateau during rainfall,and a number of researchers paid attention to its effects on infiltration,runoff production and sediment yield.Based on field data,this paper analyzed the factors influencing runoff production(such as infiltration and rainfall intensity) and the effects of soil crust on runoff production in critical condition.It is found that in the condition of the special runoff mode,that is,runoff begins when rainfall intensity exceeds soil infiltration rate of the study area,soil crust reduce infiltration,and so reduce the critical rainfall intensity condition of runoff production and improve the probability of runoff beginning.Under the field condition,rainfall intensity is changeful,high probability of runoff beginning does not induce the increasing of runoff volume,for that the runoff volume is affected by other factors,such as rainfall lasting time and rainfall intensity.However during the indoor experiments,the factors are controllable,for example,rainfall intensity and rainfall lasting time is constant,so the reduction of critical rainfall intensity means the predating of runoff beginning and the increasing of runoff volume.
CHENG Qin-Juan,, CAI Qiang-Guo, ZHENG Ming-Guo
. Effects of Soil Crust on Critical Rainfall Intensity of Runoff Production[J]. SCIENTIA GEOGRAPHICA SINICA, 2007
, 27(5)
: 678
-682
.
DOI: 10.13249/j.cnki.sgs.2007.05.678
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