نتایج جستجو برای: soil column

تعداد نتایج: 253151  

Journal: :International Journal Of Recycling of Organic Waste in Agriculture 2013

Journal: :Chemosphere 2010
M R Heal C A Dickey K V Heal R T Stidson M Matucha J N Cape

Previous work has indicated that the soil is important to understanding biogeochemical fluxes of trichloroacetic acid (TCA) in the rural environment, in forests in particular. Here, the hydrological and TCA fluxes through 22 in situ soil columns in a forest and moorland-covered catchment and an agricultural grassland field in Scotland were monitored every 2 weeks for several months either as co...

Journal: :Environmental science & technology 2004
Francis X M Casey Heldur Hakk Jirí Simůnek Gerald L Larsen

Hormones excreted in animal waste have been measured in surface and groundwater associated with manure that is applied to the land surface. Limited studies have been done on the fate and transport of androgenic hormones in soils. In this study, batch and column experiments were used to identify the fate and transport of radiolabeled [14C] testosterone in agricultural soils. The batch results in...

2012
Youventharan Duraisamy A. Aziz

This paper presents the compressibility of tropical peat reinforced with cylindrical cement columns. When a cement column is installed vertically in peat, its compressibility is reduced because of the hardened skeleton matrix formed by cement particles bonding with adjacent soil particles in the presence of pore water. The effects of the cement column diameter on the compressibility have been i...

2009
Paul Koeniger Christian Leibundgut Timothy Link John D. Marshall

The stable isotopes deuterium (H, D) and oxygen 18 (O) were applied in water for use as tracers in column experiments and in two field studies. Their performance was compared against uranine and was used to characterize saturated and unsaturated water movement and depths of plant water uptake. Deuterium and O are completely soluble and chemically and biologically stable. They are not subject to...

2008
David M. Lawrence Andrew G. Slater Vladimir E. Romanovsky Dmitry J. Nicolsky

[1] The sensitivity of a global land-surface model projection of near-surface permafrost degradation is assessed with respect to explicit accounting of the thermal and hydrologic properties of soil organic matter and to a deepening of the soil column from 3.5 to 50 or more m. Together these modifications result in substantial improvements in the simulation of near-surface soil temperature in th...

2005
WILLIAM F. DEBUSK K. RAMESH REDDY

A field study was conducted in a nutrient-impacted marsh in Water Conservation Area 2A (WCA-2A) of the Everglades in southern Florida, USA, to evaluate early stages of plant litter (detritus) decomposition along a well-documented trophic gradient, and to determine the relative importance of environmental factors and substrate composition in governing decomposition rate. Vertically stratified de...

2017
Jing-Ting Zhang Zhi-Min Wang Shuang-Bo Liang Ying-Hua Zhang Shun-Li Zhou Lai-Qing Lu Run-Zheng Wang

A considerable amount of surplus nitrogen (N), which primarily takes the form of nitrate, accumulates in the soil profile after harvesting crops from an intensive production system in the North China Plain. The residual soil nitrate (RSN) is a key factor that is included in the N recommendation algorithm. Quantifying the utilization and losses of RSN is a fundamental necessity for optimizing cr...

2000
A. Ritter R. Muñoz-Carpena C. M. Regalado M. Vanclooster S. Lambot

Data of two or more state variables are recommended for porous media flow parameter estimation by inverse modeling. In this context, it is desirable to minimize efforts and cost when measuring these variables. A method to analyze the suitability of different sampling alternatives to identify the flow parameters from transient flow experiments by inverse modeling is proposed and tested in a larg...

2017
Karin Björklund Loretta Li

Bioretention, also known as rain garden, allows stormwater to soak into the ground through a soil-based medium, leading to removal of particulate and dissolved pollutants and reduced peak flows. Although soil organic matter (SOM) is efficient at sorbing many pollutants, amending the bioretention medium with highly effective adsorbents has been proposed to optimize pollutant removal and extend b...

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