Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"Matric potential"”.
-
Influence of soil bulk density and matric potential on relative gas diffusivity and urea/nitrate-derived N₂O and N₂ losses
… changes in soil physical properties increase the potential for N₂O emissions via denitrification from soil due to enhanced anaerobic conditions, especially in the presence of suitable substrates. Nitrous oxide (N₂O) is a greenhouse gas whose production in soils is mediated by nitrifying and …
-
EXTENSIVE GREEN ROOF SUBSTRATE COMPOSITION: EFFECTS OF PHYSICAL PROPERTIES ON MATRIC POTENTIAL, HYDRAULIC CONDUCTIVITY, PLANT GROWTH, AND STORMWATER RETENTION IN THE MID-ATLANTIC.
… and component effects on hydraulic conductivity, matric potential, and plant growth. Several commercial substrate blends were tested for durability against successive freeze/thaw cycles with before and after-treatment granulometric distribution analyses. All substrate blends showed significant …
-
Hydrodynamic characterisation of soil subsurface flows for water conservation purposes.
… the volumetric soil water content θ (%) and soil matric potential Ψ (kPa) are measured using precision sensors. The soil water characteristics curve is obtained as a relationship between the volumetric soil water content and the soil matric potential. Gravity-driven flow experiments are conducted …
-
Physical Investigation of Field Scale Groundwater Recharge Processes in the Virginia Blue Ridge Physiographic Province
… Rock Research Site suggest that recharge potential can be separated into two regions: one over a vertically oriented shear zone associated with the small scale thrust fault, and the other overlying a thrust fault hanging wall. The angle of dip of the thrust fault shear zone and the …
-
Geomorphology and rehabilitation of erosion-degraded areas using soil bioengineering in the Rio Bacanga basin, São Luís, Maranhão State
… soil surface changes using erosion pins, soil matric potential, runoff and sediment loss. 4. The rehabilitation of Sacavém gully using soil bioengineering techniques (using geotextiles constructed from palm leaves of the Buriti tree). Mapping showed that identified gullies are located on the …
-
Growth and Physiology of Several Urban Tree Species in Soils Disturbed by Construction Fill or Compaction
… various combinations of soil strength and soil matric potential. In moderately compacted soil (1.5 g cm-3 bulk density), maple seedlings, but not dogwoods, had greater root growth rate, root length per plant, and ratio of root length to root dry weight in the wet soil (0.006 MPa soil matric …
-
X-ray attenuation techniques to explore the dynamics of water in porous media
… relationship between the water content and the matric potential is necessary: the soil-water characteristic. There are several models that describe this curve. Their parameters are typically determined from dynamic outflow experiments. A experimental setup was designed, that allows measurements …
-
Simulação do fenômeno de infiltração em modelos chuva-vazão
… were estimated from soil characteristic curves (matric potential x moisture retention). These curves can be obtained through Rawls, Brakensiek and Saxton's (1982) regression models, using particle size distribution, bulk density, organic matter percentage, and moisture retention under -1500 kPa …
-
Root responses to soil physical conditions and the role of root-particle contact
… elongation o f root and shoots in relation to matric potential and soil strength in contrasting species. The role of root-particle contact for root and shoot elongation in relation to particle/aggregate size and bulk density at various matric potentials is discussed.<br/><br/>Root and shoot …
-
Nutritional capability of and substrate suitability for Pseudogymnoascus destructans, the causal agent of bat white-nose syndrome
… All isolates were intolerant to PEG-induced matric potential with delayed germination and growth at -2.5 MPa with no visible germination at -5 MPa. Interestingly, decreasing the surface tension with Tween 80 permitted germination and growth of P. destructans in -5 MPa PEG medium within 14 …
-
An Evaluation of Borehole Hydraulic Conductivity Equations and Field Determined Soil Water Characteristic Curves
… with volumetric water content and soil water matric potential sensors to facilitate the determination of field-obtained soil water characteristic curves (SWCCs) and hydraulic conductivity functions (k-functions) for unsaturated soils. For the determination of the SWCCs and k-functions, each …
-
AN INVESTIGATION OF SOIL WATER MOVEMENT ON DRAINED AND UNDRAINED CLAY GRASSLAND IN SOUTH WEST ENGLAND
… generated under unsaturated conditions (little matric potential response and no water table was identified). Stable oxygen concentrations were δ18O +3.5 and -5.8 in tracer and background water respectively. Drainflow indicated that there was rapid interaction between applied tracer and soil …
-
Impacts of Salinity on Germination, Growth, Oxalate and Inorganic Ion Relations
… with a wide geographical distribution, has a potential as a high yielding forage plant for saline soils. However, the autecology of kochia in general, and the Saskatchewan populations in particular, is virtually unexplored. Germination and early seedling growth responses of different …
-
SPATIAL VARIABILITY OF THERMAL PROPERTIES IN RECLAMATION COVER SYSTEMS
… to water content as represented by the soil matric potential. A dry cover system tended to homogenize thermal property distribution, leading to a dominance of the 108 m and field scale trend. Wetter days led to a shift to the 30 m scale, with intermediate days showing a mix in scale …
-
Defining practical limits for centre-pivot length and irrigation management on Lismore soils
… applications of water typically occur. The potential for design and management strategies to improve water use efficiency on this common New Zealand agricultural soil type was assessed. Four instrumented lysimeters at the Lincoln University Lysimeter Laboratory were subjected to a range of …
-
Germinación de frutos y semillas de naranjillo (Citronella mucronata (Ruiz & Pavón) D. Don) bajo distintas condiciones de temperatura y humedad
Desde 2010, la zona central de Chile enfrenta una megasequía que ha intensificado el estrés hídrico y térmico sobre los bosques nativos, afectando especialmente las etapas iniciales del ciclo de vida de las especies arbóreas. Citronella mucronata (naranjillo), árbol endémico clasificado como …
-
Ecological significance of seed traits in the genus Macaranga
According to the regeneration niche hypothesis, the transition from seeds to seedlings is critical in determining plant distribution patterns. This initial stage of recruitment may be strongly influenced by seed mass via effects on the sensitivity to light quality and soil moisture availability for …
-
Effect of polyacrylamides on the physical properties of some light-textured soils.
… retaining more water in the rootzone, there was potential to save a considerable amount of costly irrigation water, and also improve crop production and quality. With encouragement from my then employer (Elders Pty Ltd) and from Ciba Specialty Chemicals Australia, I undertook to explore my …