Soil Water Dynamic on Slope and Its Response to Microtopography in Beijing Rocky Mountainous Area
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S157.1

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    Abstract:

    To understand the temporal and spatial distribution and variation of slope soil water in different microtopography. In this study, the Beijing Jiufeng National Forest Park slope forest was taken as the research object. Based on detailed investigation, 30 soil water observation points that with 10 cm intervals were arranged on the slope of 40 m×50 m, and the observation depth ranges from 50 to 70 cm. We conducted a total of 20 soil water observations from April 2015 to October 2015. The results showed that:(1) Slope soil water has the same temporal change trend, and it generally changes with the fluctuation of the rainfall. (2) The soil water changed with the change of the slope position, for horizontal step, the upper slope position < the middle slope position; for gentle slope, the middle slope position < the down slope position. (3) The overall slope soil water content increased with soil depth. Soil and water conservation engineering measures could effectively improve the soil water status. The microtopography mainly affected the soil layer larger than 30 cm.Soil water content of different microtopography was shown as: level bench > gentle slope > steep slope > scarp, soil water content of level bench was significantly higher than that of other microtopography (P<0.05). (4) Redundant analysis results showed that microtopography was the main factor affecting soil water content, with relative contribution rates of 81.2%. Microtopography factors weakened the influence of altitude and slope position on soil water content. This study could provide a basis for the assessment of the impact of ecological restoration of rocky mountainous areas on hydrology and water resources.

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History
  • Received:November 15,2021
  • Revised:
  • Adopted:
  • Online: May 27,2022
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