Temporal stability of soil moisture: a case study in a small watershed in the subtropical region of Brazil

Wojahn, Victória de Souza; Bartels, Guilherme Kruger; Collares, Gilberto Loguércio

doi:10.1007/s12665-022-10744-8

Cited by 1 publication

(1 citation statement)

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“…Numerous factors affect soil moisture, including climate, precipitation, temperature, altitude, latitude, longitude, vegetation type, topographic factors, land‐use type, and soil type (van Gestel & van Diepen, 1997; Yang et al, 2016; Fu et al, 2022). Topographic factors, land‐use type, and vegetation restoration age are the main factors influencing shallow and deep soil moisture heterogeneity during the dry season in small watersheds (Biswas et al, 2014; Entekhabi et al, 1996; Radatz et al, 2013; Wojahn et al, 2023). The slope affects the shallow soil moisture distribution by influencing rainfall infiltration, and the slope aspect affects the shallow soil moisture distribution by impacting soil evaporation and vegetation transpiration (Fu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution characteristics and influencing factors of shallow and deep soil moisture under ecological restoration in the loess plateau, China

Wen,

Li,

et al. 2024

Hydrological Processes

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Deep soil moisture is one of the primary factors restricting vegetation growth on the Loess Plateau (LP) of China. Investigating the spatial variations and influencing factors of shallow and deep soil moisture is of great significance for ecological restoration on the LP. In this study, we sampled disturbed soil up to a depth of 10 m with a soil drill. A 200 × 200 m grid was superimposed on a digital topographic map, and 78 sampling sites were selected across the Zhifanggou (ZFG) watershed. According to the results, the vertical profile of soil could be subdivided into four layers: the shallow active layer (SAL; 0–0.5 m), the shallow rainfall recharge layer (SRL; 0.5–2.2 m), the deep excessive layer (DEL; 2.2–4 m), and the deep stable layer (DSL; 4–10 m). The horizontal distribution characteristics of soil moisture in various soil layers were similar, with a generally high concentration in the south and a low concentration in the north. In addition, a relatively low soil moisture content (SMC) occurred in the center of the SRL. Soil moisture was negatively correlated with slope and slope aspect between 0 and 2.2 m (p < 0.05), whereas slope and slope aspect had no significant effects on deep soil moisture (>2.2 m). The SMCs of the four soil layers, from lowest to highest, were as follows: forestland, shrubland, and grassland. The SMC of forestland was negatively correlated with restoration age, whereas the SMC of grassland was positively correlated with restoration age. This study deepens our understanding of shallow and deep soil moisture distribution characteristics and the corresponding ecological restoration on the LP and provides a reference for the rational use of deep soil moisture.

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