A method for assessing the impact of load on mechanical stability and on physical properties of soils

Horn, Rainer; Fleige, Heiner

doi:10.1016/s0167-1987(03)00102-8

Cited by 213 publications

(147 citation statements)

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“…The influence of earthworms on aggregation, which include processes like homogenization of the surrounding soil volume by shearing, smearing and therewith occurring blockage of smaller lateral side pores (see also Pagenkemper et al, 2013), is also reflected by alterations in pore functions (Horn and Fleige, 2003). It can be confirmed for the micro-scale by reduced values for D s /D O for biopores of EW and REW-type, as well as aggregation of biopore walls of the REW-type which was more homogenous than that of the R-type (Figure 3).…”

Section: R Ew Rewmentioning

confidence: 99%

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Haas

Horn

2018

Front. Environ. Sci.

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Macroscopic biopores, like earthworm burrows or channels which remain after a root decayed, act as preferential flow paths for water, gas, and heat transport processes, and viewing at agricultural production, as preferential elongation paths for plant roots. These processes result in intense alterations of the soil volume and its composition that surrounds the pores. The effects of these processes were analyzed at small-scale and physico-chemical soil parameters, i.e., relative oxygen diffusion coefficient (D s /D O ), oxygen partial pressure pO 2 , Eh and pH of biopore walls, were measured. The analyses were carried out on undisturbed soil samples with different colonization history, excavated from a haplic Luvisol derived from loess. Soil resistance to penetration was determined simultaneously with D s /D O and pO 2 using a coupled, self-developed approach, and four matric potentials (namely, m = −1 kPa; −3 kPa; −6 kPa or −30 kPa) were considered. We hypothesized that physico-chemical soil parameters in biopore walls were altered due to differing influences on the soil aggregation. Aggregation was visualized with scanning electron microscopy, classified and used to explain differences in-soil properties. Plant roots and earthworms altered aggregation next to biopore surfaces in a contrasted way, either by enhancing aggregates diversity or homogenizing it. Roots led to the formation of subpolyeders while earthworms formed subplates. Pore functions of microaggregates were comparable to those of larger scale, and subpolyeders showed much more favorable soil properties in terms of soil aeration (Ds/Do, pO2). Replicates of all parameters scattered intensely and showed deviations up to several orders of magnitude in case of D s /D O underlining the large variability of soil properties in biopore walls.

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Section: R Ew Rewmentioning

confidence: 99%

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Haas

Horn

2018

Front. Environ. Sci.

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“…Soil cover, water infiltration, and soil structure are well known to adversely change with over-grazing especially in arid rangelands (Horn and Fleige 2003;Fu et al 2004). In six rangeland Provinces the proportion of degraded rangelands rose between 1990 and 1999 due to over-grazing (Table 2).…”

Section: Over-grazingmentioning

confidence: 99%

Rangeland degradation and restoration management in China

et al. 2008

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Abstract. Rangelands of China have for centuries provided forage for livestock but now their role in water, soil, and biodiversity conservation is being recognised by Governments and people. However, much of the rangelands has recently degraded and desertification is now a widespread problem. The cause of the degradation is over-grazing and over-cultivation. Climate change is exacerbating the problem. The Chinese Governments have begun to address these severe problems through policy adjustments and projects. In parallel, some research and development is taking place. There are major impediments to addressing the problem; the importance of rangelands to China and its people are generally underestimated, legislative protection is incomplete and often ineffective, little attention is paid to scientific knowledge for development of management of natural resources, there is insufficient technological support, and Governments are not able to invest sufficiently to effectively restore and develop rangeland natural resources. However, with this background we propose how the problems might be more effectively addressed in the future.

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“…The hydraulic conductivity as the soil cohesion and the internal friction angle (used both in SINMAP and TransSlide) were derived from soil texture data using typical soil properties values from literature [44,45]. The general soil characteristics of the catchment were derived by comparing the lithological map of the study area [23] and field data.…”

Section: Data and Explanatory Variablesmentioning

confidence: 99%

Multi-scale Robust Modelling of Landslide Susceptibility: Regional Rapid Assessment and Catchment Robust Fuzzy Ensemble

Bosco

Rigo

Dijkstra

et al. 2013

IFIP Advances in Information and Communication Technology

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Abstract. Landslide susceptibility assessment is a fundamental component of effective landslide prevention. One of the main challenges in landslides forecasting is the assessment of spatial distribution of landslide susceptibility. Despite the many different approaches, landslide susceptibility assessment still remains a challenge. A semi-quantitative method is proposed combining heuristic, deterministic and probabilistic approaches for a robust catchment scale assessment. A fuzzy ensemble model has been exploited for aggregating an array of different susceptibility zonation maps. Each susceptibility zonation has been obtained by applying heterogeneous statistical techniques as logistic regression (LR), relative distance similarity (RDS), artificial neural network (ANN) and two different landslide susceptibility techniques based on the infinite slope stability model. The sequence of data-transformation models has been enhanced following the semantic array programming paradigm. The ensemble has been applied to a study area in Italy. This catchment scale methodology may be exploited for analysing the potential impact of landscape disturbances. At regional scale, a qualitative approach is also proposed as a rapid assessment technique -suitable for application in real-time operations such as wildfire emergency management.

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A method for assessing the impact of load on mechanical stability and on physical properties of soils

Cited by 213 publications

References 1 publication

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Rangeland degradation and restoration management in China

Multi-scale Robust Modelling of Landslide Susceptibility: Regional Rapid Assessment and Catchment Robust Fuzzy Ensemble

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