Soil water content temporal-spatial variability of the surface layer of a Loess Plateau hillside in China

Hu, Wei; Shao, Ming; Wang, Quan Jiu; Reichardt, Klaus

doi:10.1590/s0103-90162008000300008

Cited by 60 publications

(44 citation statements)

References 13 publications

(7 reference statements)

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“…As indicated by the highest fsa proportion within various particle sizes, this fraction is ubiquitously and homogeneously distributed over the DF profiles. In most studies about particle size distribution, CV was found to range from 10-100 %, as reported by Hu et al (2008). The results showed that the effect of erosion and check dams on PSD was significant.…”

Section: Classic Statistical Analysismentioning

confidence: 65%

“…Due to the large pore structure, the low soil water content is more significantly related with cas in the DF. Hu et al (2008) observed no correlations with particle size at low soil water contents. This result indicates the trend of most particle size groups to show low correction with the soil water content, except for the csa fraction, which tends to be more prevalent with soil water content in the DF.…”

Section: Enrichment Ratio Of Particlesmentioning

confidence: 77%

“…This result contradicted the study of Young (1980), who found that 0.02-0.2 mm was the most erodible particle-size group. This can be explained by the fact that soil erosion and soil loss were mainly associated with heavy rains on the CLP, and the eroded soil was sandy loam with high sa contents, as explained by Hu et al (2008). Consequently, the various eroded environments and materials, and mainly rainfall intensity and soil texture, would determine the most erodible particlesize group.…”

Section: Enrichment Ratio Of Particlesmentioning

confidence: 99%

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Effects of erosion and deposition on particle size distribution of deposited farmland soils on the chinese loess plateau

Zhao¹,

Shao²,

Omran

et al. 2011

Rev. Bras. Ciênc. Solo

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Particle size distribution (PSD) in the soil profile is strongly related to erosion, deposition, and physical and chemical processes. Water cycling and plant growth are also affected by PSD. Material sedimented upstream of the dam constructions formed large areas of deposited farmland (DF) soils on the Chinese Loess Plateau (CLP), which has been the site of the most severe soil erosion in the world. Two DFs without tillage on the CLP were chosen to study the combined effect of erosion and check dams on PSD. Eighty-eight layers (each 10 cm thick) of filled deposited farmland (FDF) soils and 22 layers of silting deposited farmland (SDF) soils of each studied soil profile were collected and 932 soil samples were investigated using laser granulometry. The particle sizes were stratified in both DFs based on soil properties and erosion resistance. The obtained results of clay and silt fractions showed similar horizontal distribution, indicating parallel characteristics of erosion and deposition processes. Fine sand represented the largest fraction, suggesting the preferential detachment of this fraction. The most erodible range of particle sizes was 0.25-0.5 mm, followed by 0.2-0.25 mm in the studied soil profiles. The correlation between particle size and soil water contents tended to increase with increasing water contents in FDF. Due to the abundant shallow groundwater, the relationship between particle size and soil water content in SDF was lost. Further studies on PSD in the DF area are needed to enhance the conservation management of soil and water resources in this region.Index terms: soil texture, stratification, soil erodibility, dam construction, soil conservation.

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Section: Classic Statistical Analysismentioning

confidence: 65%

Section: Enrichment Ratio Of Particlesmentioning

confidence: 77%

Section: Enrichment Ratio Of Particlesmentioning

confidence: 99%

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Effects of erosion and deposition on particle size distribution of deposited farmland soils on the chinese loess plateau

Zhao¹,

Shao²,

Omran

et al. 2011

Rev. Bras. Ciênc. Solo

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“…The predominant soil type, a Los-Orthic Entisol in the Chinese Taxonomic System (Gong, 1999) or a Calcaric Regosol in the FAO Taxonomic System (FAO: Unesco, 1988), has developed a sand loam over wind-accumulated loess parent material. Further details about this area can be found in Hu et al (2008).…”

Section: Methodsmentioning

confidence: 99%

Temporal changes of an alfalfa succession and related soil physical properties on the Loess Plateau, China

She

Shao

Timm

et al. 2009

Pesq. agropec. bras.

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-The objective of this work was to investigate the relationship between changes in the plant community and changes in soil physical properties and water availability, during a succession from alfalfa (Medicago sativa L.) to natural vegetation on the Loess Plateau, China. Data from a succession sere spanning 32 years were collated, and vegetative indexes were compared to changes related to soil bulk density and soil water storage. The alfalfa yield increased for approximately 7 years, then it declined and the alfalfa was replaced by a natural community dominated by Stipa bungeana that began to thrive about 10 years after alfalfa seeding. Soil bulk density increased over time, but the deterioration of the alfalfa was mainly ascribed to a severe reduction in soil water storage, which was lowest around the time when degradation commenced. The results indicated that water consumption by alfalfa could be reduced by reducing plant density. The analysis of the data also suggested that soil water recharge could be facilitated by rotating the alfalfa with other crops, natural vegetation, or bare soil.Index terms: Medicago sativa, agropastoral transition zone, community characteristics, soil physical properties, soil water restoration. Variações temporais de uma sucessão de alfafa e de propriedades físicas do solo a elas relacionadas no Loess Plateau, ChinaResumo -O objetivo deste trabalho foi investigar a relação entre variações em uma comunidade de plantas e variações nas propriedades físicas do solo e na disponibilidade de água, durante uma sucessão de alfafa (Medicago sativa L.) por vegetação natural, no Platô Loess, na China. Dados de uma sucessão de 32 anos foram examinados e índices vegetativos foram comparados em relação às variações de densidade do solo e do armazenamento de água no solo. A produção de alfafa aumentou aproximadamente por sete anos, e então decresceu, e a alfafa foi substituída por uma comunidade natural dominada pela Stipa bungeana, que começou a crescer vigorosamente dez anos após a semeadura da alfafa. A densidade do solo aumentou com o tempo, e a deterioração da alfafa se deu principalmente em razão da redução severa da água armazenada no solo, que atingiu o mínimo quando a degradação da alfafa começou. Os resultados indicam que o consumo de água pela alfafa poderia ser reduzido pela redução na densidade de plantas e que a recarga de água no solo poderia ser facilitada pela rotação entre a alfafa e outras culturas, vegetação natural ou solo nu.Termos para indexação: Medicago sativa, zona de transição agropastoril, comunidades características, propriedades físicas do solo, recuperação da água no solo.

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“…Disc infiltration tests were carried out on the lower 160 m of the slope, over which purple medic (Medicago sativa L.) of 30 years of age is being converted to couch grass as the dominant vegetation. More information about this area can be found in Hu et al (2008).…”

Section: Field Site Descriptionmentioning

confidence: 99%

Spatial variability of soil hydraulic properties on a steep slope in the loess plateau of China

Shao

Wang

et al. 2008

Sci. agric. (Piracicaba, Braz.)

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The understanding of the structure of the spatial variability of soil surface hydraulic properties on steep slopes is important for modeling infiltration and runoff processes. The objective of this study was to investigate the spatial variability of these properties on a steep slope of the Loess Plateau in northwest China. A 9600 m 2 area was systematically sampled in a grid of 106 points spaced 10 m × 10 m. Hydraulic properties were determined with a disc infiltrometer under multiple pressure heads (-15, -9, -6, -3, 0 cm) at each sample point. Classical and geo-statistical methods were used for data analysis. The results indicated that the variation of Gardner's α and hydraulic conductivities at all applied pressure heads was moderate and the heterogeneity for hydraulic conductivities increased as the applied pressure head increased. Along the slope, hydraulic conductivities generally decreased downwards, while the Gardner's α fluctuated slightly. The Gardner's α of the shaded aspect of the slope was greater than that of the sunny aspect. The hydraulic conductivities of the shaded aspect were greater at higher pressure heads as compared to the sunny aspect, but lower than those of the sunny aspect at lower pressure heads. Correlation analysis showed a negative correlation between hydraulic conductivity and soil organic matter and clay (<0.01 mm) contents. Hydraulic conductivities at pressure heads of -3, -6, -9, -15 cm varied across the slope and their spatial dependence increased as the pressure head declined. The heterogeneity and spatial dependence of hydraulic properties were larger for the areas with shaded aspect as compared to the sunny aspect, however, as pressure decreased they showed a progressively increasing spatial structure, and their spatial structure behaved increasingly similar in both the shaded and sunny aspects. Key words: disc infiltrometer, steep sloping land, pressure head, spatial structure VARIABILIDADE ESPACIAL DE PROPRIEDADES HÍDRICAS DO SOLO DE UMA ENCOSTA DO "LOESS PLATEAU" DA CHINARESUMO: A compreensão da estrutura da variabilidade especial das propriedades hidráulicas do solo de encostas íngremes é importante na modelagem dos processos de infiltração e de escoamento superficial da água. O objetivo deste estudo foi investigar a variabilidade destas propriedades em uma encosta íngreme do "Loess Plateau" do noroeste da China. Uma área de 9600 m 2 foi sistematicamente amostrada em um grid de 106 pontos espaçados de 10 m × 10 m. As propriedades hídricas foram determinadas com um infiltrômetro de disco operando sob múltiplas cargas hidráulicas (-15, -9, -6, -3, 0 cm) em cada ponto de observação. Métodos clássicos e geoestatísticos foram empregados na análise dos dados. Os resultados mostraram que a variação do índice α de Gardner e das condutividades hidráulicas em todas as cargas aplicadas foi moderada e que a heterogeneidade das condutividades hidráulicas aumentou à medida que a carga hidráulica aumentava. Na direção do declive, as condutividades geralmente decresceram a jus...

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Soil water content temporal-spatial variability of the surface layer of a Loess Plateau hillside in China

Cited by 60 publications

References 13 publications

Effects of erosion and deposition on particle size distribution of deposited farmland soils on the chinese loess plateau

Effects of erosion and deposition on particle size distribution of deposited farmland soils on the chinese loess plateau

Temporal changes of an alfalfa succession and related soil physical properties on the Loess Plateau, China

Spatial variability of soil hydraulic properties on a steep slope in the loess plateau of China

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