Results 241 to 250 of about 2,026,551 (283)

Distributed Disturbance and Constraint in Soils

1988
Abstract Experiments in which a variety of boundary conditions were imposed in plane strain drained shear tests on dense Leighton Buzzard sand are reported. The results show that transient distributed disturbances or extremely localised yet evenly distributed restraints on the boundaries of the elements can have large effects on the strength and ...
O.O. Ogunbekun, A. Dalili, J.R.F. Arthur, T. Dunstan   +3 more
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Colonisation of hair in disturbed soils

Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences, 1988
SynopsisLaboratory soil samples are disturbed soils which resemble the arable condition so common in the external world. They have many advantages for study of colonisation of buried substrates and activity may be monitored continuously by the use of a newly-developed automatic electrolytic respirometer.
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Sample Disturbance of Collapsible Soil

Journal of Geotechnical Engineering, 1990
Collapsible soils are susceptible to a large reduction in volume upon wetting. For the soil tested, the sampling process did have an effect on the laboratory test results. The process of driving a Shelby Tube into the collapsible soil deposit caused fracturing which resulted in different consolidation test results than those tests on block samples. For
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Soil Invertebrates as Bioindicators of Human Disturbance

Critical Reviews in Plant Sciences, 1996
Abstract The aim of this paper is to try to face up to the increasing demand for soil bioindicators to determine the state of health of the environment. Terrestrial ecosystems are contaminated by a wide range of pollutants originating from different sources and having very different distributions.
M. G. Paoletti, M. Bressan, C. A. Edwards   +2 more
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Forest Disturbances and Soil Degradation

2013
Forests have been disturbed by natural and anthropogenic agents from the day they evolved on this planet. Harvesting , fuelwood collection , windthrow , insect and disease outbreak, flooding , fires, shifting cultivation , grazing etc. are the main forest disturbance processes.
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Aging in soil increases the disturbance of microplastics to the gut microbiota of soil fauna

Journal of Hazardous Materials
Microplastics (MPs) in the soil environment inevitably experience aging processes. However, how aging in soil affects MP toxicity to soil fauna remains poorly understood. In this study, two types of widely distributed MPs (polypropylene and tire wear particles) were aged in different soils, and their surface properties, morphology, leaching features of
Jing Ding, Zhaoqin Liang, Min Lv, Xiuyu Li, Shuang Lu, Suyu Ren, Xiaoyong Yang, Xiaoqiang Li, Chen Tu, Dong Zhu, Lingxin Chen   +10 more
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Soil: Do Not Disturb, Mycorrhiza in Action

2017
Fungi are key actors in controlling primary productivity. Depending on the fungal functional group, they may promote or decrease plant productivity. It is consensual that arbuscular mycorrhizal and some endophytic fungi contribute to promote plant productivity and defense against phytopathogenic organisms, including fungi.
Cristina Cruz, Alessandro Ramos, Olubukola Oluranti Babalola, Hessini Kamel, Teresa Dias, Ajit Varma   +5 more
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Disturbance and Recovery of Biological Soil Crusts

2001
Disturbance can profoundly affect the cover, species composition, and the physiological functioning of biological soil crusts. The disturbances we discuss include air pollution; exposure to oil, herbicides, and pesticides; invasion by annual exotic weeds; mechanical disturbances such as human and livestock trampling (see Chap.
J. Belnap, D. Eldridge
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Hydraulic Properties of Disturbed and Undisturbed Soils

1967
A study was made to determine whether or not disturbed materials are suitable for modeling undisturbed porous media. One requirement for similitude between a model and prototype involving partially saturated flow is that the relationship between permeability and capillary pressure be similar.
G. E. Laliberte, A. T. Corey
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Using Hydric Soil Indicators in Disturbed Soils

Soil Survey Horizons, 1997
G.W. Hurt, V.W. Carlisle
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