An analysis on runoff interception and sediment reduction effect by litter in Cinnamomum camphora forest
XU Hongjiao, HU Haibo, CHU Lei, YAN Chao, WANG Chaoqi
Co-Innovation Center for Sustainable Forestry in Southern China, Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, 210037, Nanjing, China
Abstract：[Backgrounds] The deterioration still exists partially though the situation of soil erosion in red soil regions of South China has been generally improved in recent years, and the reduction of soil erosion is not proportional to the magnaged area. The undergrowth litter layer is generally considered to be useful in reducing the damage of soil from rainfall. Therefore, the aim of this study is to reveal the mechanism of slope erosion by analyzing the effects of undergrowth litter of Cinnamomum camphora forest on runoff interception and sediment reduction. [Methods] There are two independent variables in this study, rainfall intensity and litter coverage. Simulated rainfall experiment was undertaken in order to simulate different rainfall intensities (30, 60, and 90 mm/h),and litter coverage was also set to be 0, 50, 100 and 250 g/m2. The dependent variables are runoff yield and sediment yield. Significance analyses and regression analyses were undertaken on these variables by using SPSS 18.0 software in order to demonstrate the effects of undergrowth litter on runoff interception and sediment reduction. Fitting analyses were also conducted by Matlab software to illustrate the relationship between sediment yield and runoff yield.[Results] Under the same rainfall intensity and litter coverage, the runoff yield increased rapidly at the beginning for a short period then remained stable, while the sediment yield also increased rapidly at the beginning but decreased afterwards, then stayed stable. More specifically, the runoff reduction rate ranged from 4.06% to 34.21% under different rainfall intensities and litter coverage. At the same condition and the same period, the sediment reduction rate ranged from 25.78%-96.73%. Additionally, the runoff yield and sediment yield both decreased with the increase of the biomass of litter under the same rainfall intensity in this experiment. Moreover, the comparison between the effects of litter coverage on the runoff yield and on the sediment yield showed that, litter cover was more effective in reducing the sediment. [Conclusions] The effect of runoff interception and sediment reduction by litter cover decreases when rainfall intensity increases;however, the litter cover can still intercept runoff and reduce sediment considerably compared to bare slope under the same rainfall intensity. That is to say, the ground litter layer can effectively mitigate soil erosion caused by rainfall because it can reduce the rainfall energy by covering bare slope therefore prevent it from direct rainfall splash. There is a clear quadratic relationship between the runoff yield and the sediment yield in this study.
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XU Hongjiao, HU Haibo, CHU Lei, YAN Chao, WANG Chaoqi. An analysis on runoff interception and sediment reduction effect by litter in Cinnamomum camphora forest. SSWC, 2021, 19(2): 86-91.
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2021, Vol. 19 
