Spatial Distribution of Soil Water Repellency in a Japanese Cypress Plantation and an Adjacent Deciduous Broad-leaved Forest.

Kobayashi, M.; Tsurita, Tatsuya; Itoh, Yuko; Kato, M. do S. A.

doi:10.4005/jjfs.88.354

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…Crockford et al (1991) measured water repellency in surface soils along a transect crossing a catchment in a direction perpendicular to valley bottom, and noted that the water repellency was weak compared to the hillslope segments and frequently Upper (2005) Middle (2005) Lower (2005) Upper (2006) Middle (2006) Lower (2006) Cumulative rainfall ( disappeared in the valley bottom. A similar tendency was obtained in a Japanese cypress plantation hillslope investigated by Kobayashi et al (2006), who found that the lack of water repellency at the bottom of the hillslope was associated with a high soil water content, whereas strong water repellency was distributed in the upper part of the hillslope. They also found that, except for the bottom of the hillslope, the whole area of the hillslope was potentially water repellent, i.e.…”

Section: Relationship Between Soil Moisture and Infiltration Ratesupporting

confidence: 82%

Spatial pattern of infiltration rate and its effect on hydrological processes in a small headwater catchment

Miyata

Kosugi

Nishi

et al. 2010

Hydrological Processes

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Abstract:Overland flow, which occurs when the rainfall intensity exceeds the infiltration rate, is an important factor in hillslope hydrological processes. Recent studies have suggested that a cause of Hortonian overland flow on forested hillslopes is the water repellency of surface soils. However, few studies have addressed the contribution of overland flow on storm runoff in such catchments. The overland flow generated on hillslopes needs to reach stream channels in order to contribute to storm runoff from a catchment. Therefore, the spatial pattern of the infiltration rate in a hillslope is essential for understanding the contribution of overland flow on storm runoff. To clarify the spatial pattern of infiltration for a hillslope, and its effect on overland flow generation and storm runoff from a small catchment with water repellent surface soil, we conducted artificial rainfall experiments along a hillslope transect (49 m) on 15 occasions over 20 months and measured the overland flow at a hillslope plot (8 ð 20 m), stream flow at an outlet of a small catchment (0Ð43 ha), and the matric potential head along the hillslope transect. The replicated measurements suggest that the relationship between the infiltration rate and soil moisture was positive due to the impact of soil water repellency, and that the infiltration rate in the lower part of the hillslope was significantly higher than that of the upper and middle parts. Overland flow for individual storms measured at the plot scale was generally greater during dry periods than wet periods, suggesting that water repellency reduced the infiltration rate in dry periods as noted at the experiment plot scale. In contrast, stormflow for all events during wet and dry periods showed the opposite trend, indicating that the impact of soil water repellency during dry periods was not sufficient or continuous enough to cause measurable increases in stormflow. For a storm event <100 mm in total precipitation, the comparison of hydrological responses during storm events between the dry and wet periods suggests that subsurface flow rather than Hortonian overland flow contributed to the storm runoff even though a substantial amount of overland flow was generated in the hillslope plot.

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Section: Relationship Between Soil Moisture and Infiltration Ratesupporting

confidence: 82%

Spatial pattern of infiltration rate and its effect on hydrological processes in a small headwater catchment

Miyata

Kosugi

Nishi

et al. 2010

Hydrological Processes

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“…These wet areas in individual plots, expand during wet conditions, suggesting greater of interconnectivity of flow paths with increasing water content [12]- [14]. Soil water repellency causes preferential infiltration [15] and it has been shown that soil water repellency increases with decreasing soil moisture [16]. Preferential infiltration including via macropores within the soil matrix was observed in a slope segment of this forested catchment based on dye tests [6] and hydrological observations [12]- [14].…”

Section: Spatial Distribution Of Soil Moisture At a Small Scalementioning

confidence: 76%

“…However, results from our study indicate that surface topography is more important in affecting surface soil moisture (soil depth ≤ 6 cm) than bedrock topography. Water repellency could also affect the water flow in forest soils not only at the plot scale but also at a slope scale [16], although at larger scales this effect is likely diminished [20]. The effect of stemflow on groundwater recharge has been shown to be relatively large in forests due to preferential infiltration [21] [22].…”

Section: Spatial Distribution Of Soil Moisture At the Small Catchmentmentioning

confidence: 99%

Spatial Distribution of Surface Soil Moisture in a Small Forested Catchment

Noguchi¹,

Tsuboyama²,

Sidle³

et al. 2014

JWARP

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Predicting the spatial distribution of soil moisture is an important hydrological question. We measured the spatial distribution of surface soil moisture (upper 6 cm) using an Amplitude Domain Reflectometry sensor at the plot scale (2 × 2 m) and small catchment scale (0.84 ha) in a temperate forest. The spatial variation of soil water content was higher during dry conditions than that during wet conditions. Results indicated 3.1 samples at the plot scale were sufficient to estimate mean soil water content when the precision was 0.1. Soil water content increased with increasing topographic index (TI) and soil-topographic index (STI) at the small catchment scale. The correlation between soil water content and TI was higher than that between soil water content and STI. This suggests that topography is more important for estimating surface soil moisture than soil depth as formation of surface soil moisture occurs at ≤6 cm.

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“…However, no significant relationship between these patterns of change and soil characteristics was found, suggesting that water infiltration on the forest soil surface depends on local soil characteristics rather than average soil characteristics. Liang et al [22] and Kobayashi et al [17] showed that root development plays an important role in soil water infiltration, so it was hypothesized that the water movement in the forest floor soil surface was controlled by the combination of roots and SWR intensity.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, low infiltration, overland flow and soil erosion have been reported in mountainous plantations where the soil surface was coated with water-repellent substances [3][4][5][13][14][15]. Although the possible impact of these properties on SWR intensity has been well discussed in previous studies [9][10][11][12][13][14][15][16][17][18][19][20], it remains unclear how these soil properties are distributed around trees on a slope. A standing tree on a slope provides different conditions in the areas upslope and downslope of its trunk [2].…”

Section: Introductionmentioning

confidence: 99%

Factors Determining Soil Water Repellency in Two Coniferous Plantations on a Hillslope

Farahnak

Mitsuyasu

Otsuki

et al. 2019

Forests

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Soil water repellency (SWR) is a cause of low water infiltration, overland flow and soil erosion in mountainous coniferous plantations in Japan. The factors determining SWR intensity were investigated in two coniferous plantations of Chamaecyparis obtusa (Siebold et Zucc.) Endl. and Cryptomeria japonica (L.f.) D. Don, using intact tree plots and cut tree plots on the same hillslope. The SWR of Ch. obtusa plots was stronger than that of Cr. japonica plots. SWR intensity decreased after tree cutting. There were no significant differences in SWR upslope and downslope of individual trees/stumps for both tree species, though areas downslope of individual Ch. obtusa trees had higher SWR intensity than those upslope. SWR intensity and soil aggregate stability were positively correlated in the Ch. obtusa intact tree plot (r = 0.88, p < 0.01), whereas in the cut tree plot, this correlation was weak with no significance (r = 0.29, p = 0.41). Soil aggregate size had a non-significant influence on SWR intensity. These findings suggest that SWR intensity was not related to the soil aggregate size, but SWR intensity seemed have a role in soil aggregation in the Ch. obtusa intact tree plot. Destruction of soil aggregates could occur after tree cutting because of physical disturbances or increased input of different types of organic matter from other vegetation into soil. The presence of Ch. obtusa introduces a source of SWR, although uncertainty remains about how water repellency is distributed around soil aggregates. The distribution pattern of soil water content and soil hydraulic conductivity around Cr. japonica was related to other factors such as the litter layer and non-water-repellant soil.

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Spatial Distribution of Soil Water Repellency in a Japanese Cypress Plantation and an Adjacent Deciduous Broad-leaved Forest.

Cited by 10 publications

References 19 publications

Spatial pattern of infiltration rate and its effect on hydrological processes in a small headwater catchment

Spatial pattern of infiltration rate and its effect on hydrological processes in a small headwater catchment

Spatial Distribution of Surface Soil Moisture in a Small Forested Catchment

Factors Determining Soil Water Repellency in Two Coniferous Plantations on a Hillslope

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