scholarly journals Pedogenesis of Mt. Sumbing Volcanic Ash above The Alteration Clay Layer in The Formation of Landslide Susceptible Soils in Bompon Sub-Watershed

2019 ◽  
Vol 4 (1) ◽  
pp. 15
Author(s):  
Waode Asryanti Wida ◽  
Azwar Maas ◽  
Junun Sartohadi
Keyword(s):  
Physical Properties ◽  
Water Content ◽  
Organic Material ◽  
Soil Layer ◽  
Soil Physical Properties ◽  
Liquid Limit ◽  
Plasticity Index ◽  
Volcanic Area ◽  
Residual Soil ◽  
Plasticity Limit

Numerous researches on landslides have been carried out by many researches. However, studies on soil physical properties related to landslides potential in volcanic area are still rare. The objective of this study was to examine the effect of soil physical properties on landslides potential. To collect the soil sample, sampling area method was applied. The soil type used in this study was the residual soil. The values of clay liquid limit, plasticity limit, plasticity index, water content, COLE index were used to measure the physical properties of the soil. Organic material was used as the supporting data. The results showed that the soil in the command area showed high value of clay which exceeded 50%. Such high level conditions in each profile affect the liquid limit; plasticity limit, plasticity index, water content, COLE index and organic material. Based on the results, it can be concluded that residual soils with significantly high clay values illustrated the risk of landslide fields formation in Bompon sub-watershed. The clay soil layer was the controlled factor of soil movement.

scholarly journals Identification of slip surfaces in shallow landslides at Aso volcano, Japan based on the fine fraction-plasticity index relationship

2020 ◽  
Author(s):  
Mega Lia Istiyanti ◽  
Satoshi Goto
Keyword(s):  
Physical Properties ◽  
Soil Layer ◽  
Fine Fraction ◽  
Liquid Limit ◽  
Shallow Landslides ◽  
Plasticity Index ◽  
Aso Volcano ◽  
Slip Surfaces ◽  
Different Characteristics ◽  
The Relationship

Abstract Shallow landslides have frequently occurred in the Aso volcano, Kyushu island, Japan. Yet, observations of the effects of the physical properties of the soil on the landslide stratigraphy have not been explained. In this study, we conducted field observations—at two landslide sites in the Takadake mountain (Aso volcano) area—to identify the slip surfaces. We found that slip surfaces (at both sites) were located in the lower part of the N3-4 Kuroboku soil layer. This was determined by characteristics of the physical properties of the soil, including particle size distribution and plasticity index. Furthermore, we identified the relationship between plasticity index and the fine fraction of the soil to help explain the identification of slip surfaces. Results showed that Kuroboku and Scoria layers have different characteristics according to the plasticity chart (liquid limit-plasticity index relationship) as well as plasticity index-fine fraction relationship.

scholarly journals Characterizing Soil Physical Properties for Soil Moisture Monitoring with the North Carolina Environment and Climate Observing Network

2012 ◽  
Vol 29 (7) ◽  
pp. 933-943 ◽  
Author(s):  
Weinan Pan ◽  
R. P. Boyles ◽  
J. G. White ◽  
J. L. Heitman
Keyword(s):  
North Carolina ◽  
Soil Moisture ◽  
Physical Properties ◽  
Soil Properties ◽  
Water Content ◽  
Bulk Density ◽  
Soil Physical Properties ◽  
The North ◽  
Wide Range ◽  
Soil Moisture Monitoring

Abstract Soil moisture has important implications for meteorology, climatology, hydrology, and agriculture. This has led to growing interest in development of in situ soil moisture monitoring networks. Measurement interpretation is severely limited without soil property data. In North Carolina, soil moisture has been monitored since 1999 as a routine parameter in the statewide Environment and Climate Observing Network (ECONet), but with little soils information available for ECONet sites. The objective of this paper is to provide soils data for ECONet development. The authors studied soil physical properties at 27 ECONet sites and generated a database with 13 soil physical parameters, including sand, silt, and clay contents; bulk density; total porosity; saturated hydraulic conductivity; air-dried water content; and water retention at six pressures. Soil properties were highly variable among individual ECONet sites [coefficients of variation (CVs) ranging from 12% to 80%]. This wide range of properties suggests very different behavior among sites with respect to soil moisture. A principal component analysis indicated parameter groupings associated primarily with soil texture, bulk density, and air-dried water content accounted for 80% of the total variance in the dataset. These results suggested that a few specific soil properties could be measured to provide an understanding of differences in sites with respect to major soil properties. The authors also illustrate how the measured soil properties have been used to develop new soil moisture products and data screening for the North Carolina ECONet. The methods, analysis, and results presented here have applications to North Carolina and for other regions with heterogeneous soils where soil moisture monitoring is valuable.

Effect of soil physical properties on the long-term performance of planted Scots pine in Finnish Lapland

2010 ◽  
Vol 90 (3) ◽  
pp. 451-465 ◽  
Author(s):  
K. Mäkitalo ◽  
V. Alenius ◽  
J. Heiskanen ◽  
K. Mikkola
Keyword(s):  
Physical Properties ◽  
Water Content ◽  
Scots Pine ◽  
Soil Physical Properties ◽  
Height Growth ◽  
Site Preparation ◽  
Preparation Methods ◽  
Finnish Lapland

Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies L. Karst.) forests dominate in Finnish Lapland. This study examined the long-term effects of soil physical properties and conditions measured in intact intermediate areas, as well as site preparation, on the survival and height growth of planted pine on eight experimental sites, 25-27 yr after reforestation. On the four originally spruce-dominated sites, pine survival was the highest on sites with a high soil air-filled porosity (AFP) near saturation (at -1 kPa), a high van Genuchten parameter, and a low soil water content (SWC) in situ, and height growth was the fastest on sites with a high soil AFP in situ and a high van Genuchten parameter n, and on sites reaching a soil AFP of ca. 0.20 m3 m-3 at a high matric potential after saturation. Survival, but not mean height, was enhanced on the spruce sites by intensive site preparation methods such as ploughing instead of lighter site preparation methods. On the four originally pine-dominated sites, site preparation affected the mean height but not survival. The use of SWC as a sole criterion for sites suitable for pine reforestation was tested and found to be uncertain. Key words: Boreal forest soils, soil water content, air-filled porosity, van Genuchten function, site preparation, reforestation, Scots pine

Effects of spent mushroom substrate on soil physical conditions and plant growth in an intensive horticultural system

Soil Research ◽  
1998 ◽  
Vol 36 (6) ◽  
pp. 899 ◽  
Author(s):  
D. P. C. Stewart ◽  
K. C. Cameron ◽  
I. S. Cornforth ◽  
J. R. Sedcole
Keyword(s):  
Plant Growth ◽  
Physical Properties ◽  
Water Content ◽  
Bulk Density ◽  
Principal Components ◽  
Crop Yields ◽  
Infiltration Rate ◽  
Soil Physical Properties ◽  
Spent Mushroom Substrate ◽  
Surface Crust

A 2-year field trial determined the influence of applying spent mushroom substrate (SMS) on soil physical properties and the growth of 4 consecutive vegetable crops (sweetcorn, cabbage, potato, cabbage). Treatments comprised 0, 20, 40, and 80 t/ha of moist SMS, both with and without inorganic fertiliser, applied to each crop, giving a range of SMS rates up to 320 t/ha. SMS improved the environment for plant root growth by decreasing soil bulk density (by 0· 05-0·25 g/cm 3 at 100 mm depth), increasing aggregate stability (by 13-16%), reducing clod and surface crust formation (by 16-31 and 18-94%, respectively), increasing the infiltration rate (by 130-207 mm/h), increasing the water content of the soil (by 0-7% w/w), and reducing diurnal temperature changes. Some of these changes were not evident until repeated applications of 80 t/ha SMS had been made. Soil physical properties were related to crop yield, and soil physical properties’ principal components were related to crop principal components using regression analysis (r2 of 0·20-0·60 and 0·16-0·54, respectively). The soil physical properties that had the most influence on plant growth were specific to each crop and included bulk density, water content, surface crust cover, infiltration rate, and aggregate size distribution. Soil physical properties had a large influence on the potato yield irrespective of fertiliser use and on both cabbage crop yields when fertiliser was not used, but not on the sweetcorn yield (the first crop to be grown). The effect of changing soil physical properties on plant growth was most apparent when fertiliser was not used. This was because the improved physical properties increased plant yield (at least in part) because of increased plant nutrient uptake.

Tillage and water content effects on surface soil physical properties

1991 ◽  
Vol 21 (1-2) ◽  
pp. 67-83 ◽  
Author(s):  
H.P. Cresswell ◽  
D.J. Painter ◽  
K.C. Cameron
Keyword(s):  
Physical Properties ◽  
Water Content ◽  
Surface Soil ◽  
Soil Physical Properties

scholarly journals Sliding layer estimation of shallow landslides on Aso volcanic mountains in Japan based on tephra layer-physical properties of soil

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Mega Lia Istiyanti ◽  
Satoshi Goto ◽  
Takashi Kimura ◽  
Go Sato ◽  
Shintaro Hayashi ◽  
...  
Keyword(s):  
Physical Properties ◽  
Fine Fraction ◽  
Shallow Landslide ◽  
Shallow Landslides ◽  
Plasticity Index ◽  
Volcanic Area ◽  
Tephra Layer ◽  
Mountain Area ◽  
Tephra Layers ◽  
Properties Of Soil

Abstract Shallow landslides occur frequently on the Aso volcanic mountains. The soil materials on the Aso volcanic mountains consist of tephra layers formed by volcanic activities. This study is aimed to specify the physical properties of soil that correlate with the sliding layer of a shallow landslide on the volcanic mountain area. Tephra layers consist of kuroboku and scoria layers and the differences between these layers were specified using the physical properties of soil methods. Results showed that the plasticity index and the fine fraction content can be used for estimating the sliding layer in the Aso volcanic area.

scholarly journals Effects of Long-Term Enclosing on Vertical Distributions of Soil Physical Properties and Nutrient Stocks in Grassland of Inner Mongolia

Agronomy ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1832
Author(s):  
Juan Hu ◽  
Daowei Zhou ◽  
Qiang Li ◽  
Qicun Wang
Keyword(s):  
Physical Properties ◽  
Inner Mongolia ◽  
Soil Layer ◽  
Soil Physical Properties ◽  
Available Phosphorus ◽  
Available Nitrogen ◽  
Green Plants ◽  
Nutrient Stocks ◽  
Vertical Distributions

Enclosing plays a crucial role in vegetation and soil quality in grassland. The biomass of green plants, litter, and vertical distributions of soil physical properties and nutrient stocks were evaluated at plot enclosed long term for 38 years inside a fence and a long-term grazing plot outside a fence in a semi-arid grassland of Inner Mongolia. The results showed that dry matter of green plants and litter during the 38-year enclosing treatment was higher than in the grazing treatment (p < 0.01). The soil silt (2–50 μm) in the 38-year enclosing treatment was 5.9% higher than in the grazing treatment (p < 0.01) in 0–10 cm soil, and the fine sand (100–250 μm) was 6.0% lower (p < 0.05). The 38-year enclosing treatment slightly decreased the bulk density and significantly decreased the electrical conductivity in each soil layer (0–100 cm). The 38-year enclosing treatment significantly increased the stocks of soil organic carbon (SOC), available phosphorus (AP), and available potassium (AK) on the surface soil, and obviously decreased the stocks of total nitrogen (TN), total phosphorus (TP), calcium (Ca), magnesium (Mg), sulfur (S), and available nitrogen (AN) in each soil layer (0–100 cm). In conclusion, long-term enclosing improved grassland production, but decreased most nutrient stocks in soil.

Influence of infiltration on Babaoliao shallow landslide in Taiwan using hydro-mechanical coupled model

2020 ◽  
Author(s):  
Ya-Sin Yang ◽  
Hsin-Fu Yeh
Keyword(s):  
Slope Stability ◽  
Water Content ◽  
Soil Layer ◽  
Coupled Model ◽  
Shallow Landslide ◽  
Residual Soil ◽  
Wetting Front ◽  
Element Analysis ◽  
Unstable Slope ◽  
The Impact

&lt;p&gt;Babaoliao landslide is located in Chiayi County of Taiwan. The geological drilling and core interpretation in previous investigation showed that exist 1 to 2 meter depths of residual soil layer above the bedrock. In this area, shallow landslides frequently occur due to the intense rainfall events. An understanding of the hydro-mechanical change under rainfall infiltration within hillslope is critical to capture the slope stability. This study used hydro-mechanical coupled model and finite element analysis to compute the field water content and stress suction, and then assess the field slope stability based on theory of local of factor. Results showed the response of internal hydraulic behavior distribution is related to terrain and the depths of bedrock. The impact of rainfall on slope stability concentrated in shallow residual soil area, since higher permeability of soil cause rainfall infiltrate into hillslope easily and form lateral flow paths, thus limiting the depths of wetting front. The discontinuity of water content distribution within hillslope may accelerate the change of hydro-mechanical behavior and unstable slope development in the hillslope. This study demonstrated the varied distribution of water content, suction stress and LFS over time and space and got the insight into the relativity unstable range of the shallow slope affected by rainfall event.&lt;/p&gt;

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