Study on the Influence of Land Utilization Type on Soil Erosion Processes in Northern Sichuan Hilly Region

Based on a long-term field location monitoring, the runoff and sediment yielding processes under the influence of vegetable planting, crops interplanting and forage grass planting was studied, and the influence of land utilization type on soil erosion processes was analyzed.The results indicated that land utilization type had important influence on annual variety regulation of runoff. The change trends of runoff in T₃ (crops interplanting) and T₄ (planting forage grass) all showed a double peak phenomena, in contrast, those of T₁ (planting vegetable) and T₂ (bare land, CK) all just had a single peak in the monitoring period of 2005−2016. However, there was no significant influence on mean annual runoff for different land utilization types; Land utilization type had stronger influence on the amount of sediment content than that on its annual change trend. The sediment content of CK (T₂) was significant higher than those in the other 3 treatments (T₁, T₃, T₄), and the former were 1.63, 2.65 and 2.56 times of the latter respectively; The change of land utilization types had significant effect on reducing soil erosion intensity. Compare to CK, the soil erosion modulus in the other 3 treatments can be reduced by 2.68−7.42 times.