Spatial distribution of caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China

Gong, Tiexiong; Zhu, Yanhui; Shao, Mingan

doi:10.1016/j.geoderma.2018.05.012

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…Mineral fragments with a minimum size of 2 mm were considered as rock fragments (Poesen et al, 1994). RFC was determined by laying a 1‐m × 1‐m square grid (Gong et al, 2018; Poesen & Lavee, 1994) that was photographed perpendicularly. Subsequently, a square mesh (20 × 20 mesh with 5‐cm × 5‐cm units) was overlaid over the photo of the square grid, and rock fragments covered by mesh units (25 cm 2 ) were counted on a computer screen (Figure 3); the RFC (%) was calculated using Equation .…”

Section: Methodsmentioning

confidence: 99%

Event‐based run‐off and sediment yield dynamics and controls in the subhumid headwaters of the Blue Nile, Ethiopia

et al. 2022

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Land degradation due to soil erosion presents a major challenge for sustainable development. We investigated run-off and sediment yield (SY) dynamics in the northwestern highlands of Ethiopia. The study area included 14 zero-order catchments with a surface area ranging from 324 to 1715 m 2 . V-notch weirs produced from plastic jars were introduced as measuring alternatives that met local constraints. Run-off (RO) depth at the weir was registered manually at 5-min intervals during two rainy seasons in 2018 and 2019, and a total of 618 events were monitored. Rainfall was measured using tipping-bucket rain gauges. RO samples were collected in 1-L bottles, and suspended sediment concentration was determined. The mean event RO coefficient ranged from 3% for forests to 56% for badlands. Similarly, the mean annual SY was lowest for forests (0.8 Mg ha À1 yr À1 ) and highest for badlands (43.4 Mg ha À1 yr À1 ), with significant differences among land-use types (14.8 Mg ha À1 yr À1 in cropland, 5.7 Mg ha À1 yr À1 in grazing land, and 2.9 Mg ha À1 yr À1 in plantations). Soil organic matter (SOM) reduced RO and SY, necessitating the consideration of agronomic and land management practices that enhance SOM. Annual SY decreased exponentially with the rock fragment cover (RFC). In fields where RFC was less than 20%, collecting rock fragments for installing stone bunds resulted in a net increase in SY. Rehabilitating badlands and enhancing SOM content in croplands can substantially reduce catchment SY and hence contribute to the sustainability of land uses in the subhumid highlands.

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Section: Methodsmentioning

confidence: 99%

Event‐based run‐off and sediment yield dynamics and controls in the subhumid headwaters of the Blue Nile, Ethiopia

et al. 2022

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“…The caliche nodules with different sizes followed a Gaussian distribution ( Figure 2), indicating that the distribution of caliche nodules was representative of the distribution found in the study area. [1,2,9] The caliche nodules were pre-processed by washing with water and were dried at 105 C for 8 h.…”

Section: Methodsmentioning

confidence: 99%

“…Intensive soil erosion has resulted in exposure of caliche nodules on the surface soil layer. The mass percentage of caliche nodules in soils is 5–30% …”

Section: Methodsmentioning

confidence: 99%

“…The presence of large particles (diameter >2 mm) in soils is often taken as an indicator of soil degradation. [1][2][3][4][5] Soils containing large particles (also called stony soils) are common in the Mediterranean region and the karst region in Southwest China and the northwest Loess Plateau in Northwest China. [6][7][8][9][10] Generally, large particles can be classified into two groups: the first is relatively soft chalk and sedimentary fragments called rock fragments, which differ from soil particles such as pebbles and flint stones; the second is caliche nodules, which are a product of soil genesis processes.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of large particles (diameter >2 mm) in soils is often taken as an indicator of soil degradation . Soils containing large particles (also called stony soils) are common in the Mediterranean region and the karst region in Southwest China and the northwest Loess Plateau in Northwest China .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Caliche Nodules on Soil Water Storage in the Northern Loess Plateau of China

Gong

Zhu

Wang

et al. 2019

CLEAN Soil Air Water

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Knowledge of water absorbed by caliche nodules is important for accurate soil water estimation. Simulated soil column experiments are used to investigate the effects of caliche nodules on soil profile water distribution and soil water estimation under given water supply conditions. The results indicate that for the treatments with five caliche nodules contents (CNC = 0, 10, 20, 30, and 40%), except for the top 0–0.1 m soil layer, the soil water content (SWC) of other layers is significantly different between the treatments (P < 0.05). The SWC is positively correlated to CNC. There are significant differences (P < 0.05) in caliche nodule water content (CWC) in the top three soil layers for all treatments. For soils with less than 10% caliche nodules, the soil water storage (SWS) in deeper soil layer (0.3–0.4 m) is significantly higher than that in surface soil layers (P < 0.05). Caliche nodule water storage (CWS) and available caliche nodule water storage (ACWS) both increase with increasing CNC. Water storage in the caliche nodules increases with the increase in CNC. There are significant differences in ACWS among soil layers in all soils (P < 0.05). The total ACWS significantly increases with the increase in CNC (P < 0.01). If water is absorbed by caliche nodules, then the total water storage of soils with CNCs of 10, 20, 30, and 40% would be underestimated by 3, 8, 10, and 17%, respectively. This study contributes to accurate soil water estimation in soils with caliche nodules and provide a scientific basis for rational utilization of soil and water resources.

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Source identification of soil elements and risk assessment of trace elements under different land uses on the Loess Plateau, China

Xiang

She

Wang

et al. 2020

Environ Geochem Health

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Spatial distribution of caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China

Cited by 15 publications

References 33 publications

Event‐based run‐off and sediment yield dynamics and controls in the subhumid headwaters of the Blue Nile, Ethiopia

Event‐based run‐off and sediment yield dynamics and controls in the subhumid headwaters of the Blue Nile, Ethiopia

Effect of Caliche Nodules on Soil Water Storage in the Northern Loess Plateau of China

Source identification of soil elements and risk assessment of trace elements under different land uses on the Loess Plateau, China

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