黄土丘陵区典型农耕地土壤稳定入渗率季节变化

Temporal Variation of Soil Steady-state Infiltration Rate Under Typical Cultivated Land in Hilly Region of Loess Plateau

[目的]揭示黄土丘陵区典型农耕地土壤稳定入渗率季节变化及其影响因素,为黄土高原地区农耕地土壤侵蚀控制、水土保持和有限水资源的有效利用提供理论依据和数据支撑。[方法]运用双环法,以黄土丘陵区典型农作物种植地为研究对象,通过入渗试验对不同作物地土壤稳定入渗率季节变化进行研究。[结果]典型农耕种植地土壤稳定入渗率具有明显季节变化(p<0.05)。不同作物地土壤稳定入渗率的季节变化趋势存在差异。种植3种作物地与裸地的土壤稳定入渗率具有显著性差异(p<0.05)。种植马铃薯地平均土壤稳定入渗率最大,其次是大豆地和谷子地。农事活动、容重、孔隙度和作物根系生长是影响农耕地土壤稳定入渗率季节变化的主要因素。[结论]黄土丘陵区典型农耕地土壤稳定入渗率具有明显的季节变化,该变化主要是由农事活动、容重、土壤孔隙度和作物根系生长等因素所导致。

[Objective]The temporal variations of soil steady-state infiltration rate under typical cultivated lands were studied and the potential factors causing those changes were explored in order to provide theoretical bases and data support for soil erosion control,soil and water conservation,and the utilization of limited water resource in the Loess Plateau.[Methods]Using two-ring infiltration experiments,the temporal variations of soil steady-state infiltration rate under typical cultivated lands were studied.[Results]The temporal variations of soil steady-state infiltration rate under typical cultivated lands fluctuated significantly over time and displayed different temporal patterns（p〈0.05）.Significant differences in soil steady-state infiltration rate were found between croplands and a bare land（p〈0.05）.Among the croplands,the maximum mean soil steady-state infiltration rate occured at area planted with potato,and followed by a soybean land,and a millet land.The temporal variations in soil steady-state infiltration rate were closely related to agriculture activities,dry bulk density,total porosity,and root growth.[Conclusion]The temporal variations of soil steadystate infiltration rate under typical cultivated land displayed significantly different temporal patterns duringone growing season（p〈0.05）,which was mainly affected by agriculture activities,dry bulk density,total porosity,and root growth.