Variability of soil physical quality in uneroded, eroded, and depositional cropland sites

Stavi, Ilan; Lal, Rattan

doi:10.1016/j.geomorph.2010.09.006

Cited by 29 publications

(17 citation statements)

References 33 publications

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“…This can be attributed to the presumably large amounts of mineral material that is susceptible to spatial redistribution after completion of the earthworks, being eroded from the source areas and deposited in the sinks. This agrees with other studies reporting that recurrence of mineral material deposition decreases soil penetration resistance in depositional sites in rangelands (Stavi et al, 2009a) and croplands (Stavi and Lal, 2011). At the same time, the mean soil penetration resistance in the source areas of each of these afforestation systems was considerably larger than that on the natural hillslopes throughout the soil profile (except the 20-30 cm depth for the 2-year-old system; Fig.…”

Section: Soil Physical Qualitysupporting

confidence: 92%

Contour bench terrace (shich/shikim) forestry systems in the semi-arid Israeli Negev: Effects on soil quality, geodiversity, and herbaceous vegetation

2015

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Section: Soil Physical Qualitysupporting

confidence: 92%

Contour bench terrace (shich/shikim) forestry systems in the semi-arid Israeli Negev: Effects on soil quality, geodiversity, and herbaceous vegetation

2015

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“…Increasing conservation of SOC content has become a symbol of sustainable agriculture. Since SOC has a pivotal role in structuring soil particles it has primary importance in soil physical properties such as porosity, aggregate stability and infiltration (Stavi and Lal, 2011). Lal (2004) estimated that global soils contain 2500 Gt carbon (1550 Gt SOC) in their uppermost 1 m thick horizon hence this is one of the largest terrestrial pool second only to the geologic stock.…”

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confidence: 99%

Redistribution of Soil Organic Carbon Triggered by Erosion at Field Scale Under Subhumid Climate, Hungary

et al. 2016

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Soil organic carbon (SOC) has primary importance in terms of soil physics, fertility and even of climate change control. An intensively cultivated Cambisol was studied in order to quantify SOC redistribution under subhumid climate. One hundred soil samples were taken from the representative points of the solum along the slopes from the depth of 20-300 cm with a mean 1.2 % SOC content. They were measured by the simultaneous application of diffuse reflectance (240-1900 nm) and traditional physico-chemical methods in order to compare the results. On the basis of the results hierarchical cluster analyses were performed. The spatial pattern of the groups created were similar, and even though the classifications were not the same, diffuse reflectance has proven to be a suitable method for soil/sediment classification even within a given arable field. Both organic and inorganic carbon distribution was found a proper tool for estimations of past soil erosion process. Results show SOC enrichment on two sedimentary spots with different geomorphological positions. Soil organic matter compound also differs between the two spots due to selective deposition of the delivered organic matter. The components of low molecular weight reach the bottom of the slope and there can leach into the profile, while the more polymerised organic matter compounds are delivered and deposited even before, on a higher segment of the slope in an aggregated form. This spatial difference appears below the uppermost tilled soil layer as well; referring the lower efficiency of conventional ploughing tillage in spatial soil homogenisation.

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“…However, no study has systematically interlinked soil aggregate properties (size and stability) to flowpaths and hydraulic connectivity under different management practices. We posit that the degree of spatial heterogeneity in both aggregate size distribution and stability along a flow pathway is affected by both hydraulic connectivity and the type and intensity of tillage practices [11,12,[46][47][48][49] (tillage intensity herein refers to the number of tillage occurrences, and the type and severity of the disturbance i.e., tillage depth and percentage of disturbed area [50]-more frequent and severe disturbances to the soil are considered to be of high intensity, whereas less frequent and minimal disturbance is considered to be of low intensity). It is assumed therefore that the spatial heterogeneity of the aggregate proxies should reflect the spatial heterogeneity of hydraulic connectivity and management across dominant flowpaths of the landscape [45] (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

The Role of Hydraulic Connectivity and Management on Soil Aggregate Size and Stability in the Clear Creek Watershed, Iowa

et al. 2018

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The role of tillage practices on soil aggregate properties has been mainly addressed at the pedon scale (i.e., soilscape scale) by treating landscape elements as disconnected. However, there is observed heterogeneity in aggregate properties along flowpaths, suggesting that landscape scale hydraulic processes are also important. This study examines this supposition using field, laboratory and modeling analysis to assess aggregate size and stability along flowpaths under different management conditions: (1) tillage-induced abrasion effects on aggregate size were evaluated with the dry mean weight diameter (DMWD); (2) raindrop impact effects were evaluated with small macroaggregate stability (SMAGG STAB ) using rainfall simulators; and (3) these aggregate proxies were studied in the context of connectivity through the excess bed shear stress (δ), quantified using a physically-based landscape model. DMWD and SMAGG STAB decreased along the flowpaths for all managements, and a negative correspondence between the proxies and δ was observed.δ captured roughness effects on connectivity along the flowpaths: highest connectivity was noted for parallel-ridge-till flowpaths, where δ ranged from 0-8.2 Pa, and lowest connectivity for contour-ridge-till flowpaths, where δ ranged from 0-1.1 Pa. High tillage intensity likely led to an increase in aggregate susceptibility to hydraulic forcing, reflected in the higher gradients of aggregate size and stability trendlines with respect to δ. Finally, a linear relationship between DMWD and SMAGG STAB was established.

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Variability of soil physical quality in uneroded, eroded, and depositional cropland sites

Cited by 29 publications

References 33 publications

Contour bench terrace (shich/shikim) forestry systems in the semi-arid Israeli Negev: Effects on soil quality, geodiversity, and herbaceous vegetation

Contour bench terrace (shich/shikim) forestry systems in the semi-arid Israeli Negev: Effects on soil quality, geodiversity, and herbaceous vegetation

Redistribution of Soil Organic Carbon Triggered by Erosion at Field Scale Under Subhumid Climate, Hungary

The Role of Hydraulic Connectivity and Management on Soil Aggregate Size and Stability in the Clear Creek Watershed, Iowa

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