Deep profile soil moisture distribution characteristics for different micro-topographies on the semi-arid Loess Plateau, China Deep profile soil moisture distribution characteristics for different micro-topographies on the semi-arid Loess Plateau, China

最小化 最大化

Vol18 No.10: 2688-2697

Title】Deep profile soil moisture distribution characteristics for different micro-topographies on the semi-arid Loess Plateau, China

Author】GOU Qing-ping1; ZHU Qing-ke1,2*; LI Yi-xuan1; TIAN Xiang-lei1; WANG Peng-xiang1; XIN Yun-ling1; LUO Shu-yuan1

Addresses】1 School of Soil and Water conservation, Beijing Forestry University, Beijing 100083, China; 2 Engineering Research Center of Forestry Ecological Engineering, Ministry of Education, Beijing Forestry University, Beijing 100083, China

Corresponding author】ZHU Qing-ke

Citation】Gou QP, Zhu QK, Li YX, et al. (2021) Deep profile soil moisture distribution characteristics for different micro-topographies on the semi-arid Loess Plateau, China. Journal of Mountain Science 18(10). https://doi.org/10.1007/s11629-020-6624-z

DOI】https://doi.org/10.1007/s11629-020-6624-z

Abstract】Soil moisture is a limiting factor for vegetation restoration on the Loess Plateau, China. Micro-topography may cause heterogeneities in the distribution of soil moisture, but little is known about its effect on deep soil moisture. Our study aims to explore the distribution and impact of soil moisture within the upper 10 m of soil for different micro-topographies. Taking undisturbed slope as the control, five micro-topographies were selected. Soil moisture over a depth of 0-10 m from 2017 to 2019 was investigated, and soil particle size and soil organic matter were measured. Variance analysis and multiple comparisons were used to analyze the difference in soil moisture for different micro-topographies and multiple-linear regression was used to analyze the influence of micro-topography on soil moisture. There are significant differences in soil moisture within the different layers underlying the examined micro-topographies, while the inter-annual variation in soil water storage for the selected micro-topographies increase with increased rainfall. The depth of influence of micro-topographic vegetation on soil moisture exceeded 1000 cm for a gully (GU), 740 cm for a sink hole (SH), 480 cm for a scarp (SC), 360 cm for an ephemeral gully (EG) and 220 cm for a platform (PL). Micro-topography will cause the heterogeneous distribution of soil moisture in the shallower layers, which changes the vegetation distribution differences between micro-topographies. This may be the survival strategy of herbaceous vegetation in response to climate change in the Loess Plateau. For future vegetation restoration efforts, we need to pay attention to the influence of micro-topography on soil moisture.

Keywords】Deep soil moisture; Erosion degradation; Micro-topography; Semiarid loess region