soil water and stream water chemical responses
Water-Quality Data from Semipermeable-Membrane Devices and Polar Organic Chemical Integrative Samplers Deployed in the McKenzie River Basin, Oregon pptx
... reported in McCarthy and others (2009) and Kelly and others (2012) Sample Collection, Laboratory Methods, and Quality Assurance The methods used to collect, prepare, and analyze samples and to assure ... Trang 1Prepared in cooperation with the Eugene Water and Electric BoardWater-Quality Data from Semipermeable-Membrane Devices and Polar Organic Chemical Integrative Samplers Deployed in the McKenzie ... Toxicology and Chemistry, v 23, no 7, p 1640–1648 Eugene Water and Electric Board, 2000, Drinking water protection plan: Eugene, Oreg., Eugene Water and Electric Board Technical Report, 23 p., accessed...
Ngày tải lên: 14/03/2014, 20:20
The relationships of forest and watershed characteristics to soil water retention, storm, runoff, erosion, and wave attenuation in vietnam
... relations between water and forestation activities at the watershed and regional scales There have not been enough hydrological studies to fully understand the linkages between forests and water (Phuong ... conducted on forest - water relationships in Vietnam This study intends to improve our understanding of the effects of forests and watershed characteristics on soil water retention and flow regimes, ... evapotranspiration and physical properties of Trang 6soil (Shukla et al., 2003) Soil water retention which is an important soil hydrological property is influenced by soil structure (Fu et al., 2000), soil...
Ngày tải lên: 03/04/2014, 12:22
Báo cáo lâm nghiệp: "Effect of single Quercus ilex trees upon spatial and seasonal changes in soil water content in dehesas of central western Spain" potx
... cm of soil. The depletion of water of the upper 250 cm of soil varied little from April onwards, i.e. soil water Soil water content in dehesas 361 Figure 4. Soil water content profiles at 2 and ... improvement of soil physical and chemical fertil- ity [33], but trees and pasture could compete for soil water. The positive effects of trees on soil physical properties include a higher soil water-holding ... rainfall decreased soil water content quickly until June or July. Soil water content remained nearly constant during the rest of the summer. Each year, minimum and maximum soil water content values...
Ngày tải lên: 07/08/2014, 16:21
Báo cáo khoa học: "Water balance of a Southern Moravian floodplain forest under natural and modified soil water regimes and its ecological consequences" pps
... underground water table and soil hydrolimits [26, 37, 38], derived from the relation of soil water (%vol) on soil water poten-tial (MPa or pF values) at the site (figure 2) Calculated values of soil ... very flat and no such flow was observed (with exception of flooding water) Items of horizontal and vertical outflows (Ohand Ov) are included in items of soil water and underground water For modeled ... Table II Main soil hydrolimits (full water capacity, field capacity – water retention, point of decreased availability and wilting points) and related soil parameters including soil hydraulic...
Ngày tải lên: 08/08/2014, 14:21
Báo cáo khoa học: "Comparative studies of the water relations and the hydraulic characteristics in Fraxinus excelsior, Acer pseudoplatanus and A. opalus trees under soil water contrasted conditions Damien Lemoinea, Jean-Paul Peltierb and Gérard" pdf
... the water relations and the hydraulic characteristics in Fraxinus excelsior, Acer pseudoplatanus and A opalus trees under soil water contrasted conditions Damien Lemoinea, Jean-Paul Peltierband ... regulation of the water status in Acer pseudoplatanus and Fraxinus excelsior trees growing in well-watered floodplains (site 1) The experiments were carried out in June 1999 and 2000, for expanded leaves ... conductance and leaf water potential ob-served in well watered flood plains for F excelsior and A pseudoplatanus, the dry conditions of the floodplains led to a decrease in the leaf water potentials...
Ngày tải lên: 08/08/2014, 14:21
Crop establishment with conservation tillage on viable weed seed density and diversity in soil, crop and water productivity under RWCS in North-West IGP: A review
... treatment and it was distributed in all soil depths being more in 0-5 and 5- 10 cm soil depths In ZT-ZT and CT-ZT (rice-wheat) treatments, density of weeds concentrated in 0-5 and 5-10 cm soil depth ... from annual dicots to grassy annuals and perennials Surface residues lower average soil temperatures and may delay emergence of both crops and weeds Germination and growth of small-seeded annuals ... at par with CTDSR-ZTW (RRR) and ZTDSR-ZTW (RRRW) Change in the crop establishment methods alters the soil ecology, while affecting the soil nutrient, soil structure and temperature, as well as...
Ngày tải lên: 29/09/2020, 13:42
Soil water repellency in red pine and hevea brasiliensis forest in thanh hoa province viet nam
... increase in runoff and erosion A number of factors are believed to control the strength of soil water repellency such as fire, vegetation type, soil texture, soil moisture and time since burning ... the soil being tested and the investigator simply notes how long it takes until these water drops are absorbed into the soil ( Doerr, Shakesby and MacDonald, 2007) The samples were also taken and ... wettable, 5s - 30s = slight water repellency and >30s = moderate and high repellency (Hubbert and Oriol 2005) The measurement was replicated 10 times at each depth and if the water repellency was...
Ngày tải lên: 23/06/2021, 17:14
Moisture transfer finite element modeling with soil water characteristic curve based parameters and its application to nhan co red mud basin slope
... accurate and reliable slope stability results and provide more reliable slope stabilization solutions Keywords: Finite element (FE), Unsaturated soil, Soil Water Characteristic Curve (SWCC), Soil-moisture ... moisture content, S is the saturated soil moisture content, ψ is the soil suction; and a and n are fitting soil parameters associated with the SWCC Fredlund and Xing (1994) [14] proposed an equation ... properties and hydraulic conductivity of the soil are given in Table 1 and that of SWCC are given in Table 2 The saturated VWC of the soils is taken to be equal to the soil porosity, and the field...
Ngày tải lên: 28/06/2021, 11:13
Soil structure and soil organic matter in water stable aggregates under different application rates of biochar
... elements of soil struc-ture They play an important role in the accu-mulation and protection of soil organic matter Trang 2(SOM), the optimization of soil water and air regimes, and the storage and availability ... proportions of WSA and the contents of SOC and CL in the WSA 3 Results and discussion Proportion of water-stable aggregates and soil structure parameters Parameters of soil structure such ... structure and carbon, ni-trogen, and phosphorus in native and cultivated soils Soil Sci Soc Am J., 50, 627-633 Fischer D., Glaser B., 2012 Synergisms between com-post and biochar for sustainable soil...
Ngày tải lên: 14/10/2022, 13:47
Pore water pressure responses of saturated sand and clay under undrained cyclic shearing
... pore water pressure accumulation in Nam o sand and Hue clay subjected to undrained uni-directional and two-dừectional cyclic shears. Keywords: Cyclic shear, effective sừess, Nam o sand, pore water ... permeability of the soil layer, limited pore water pressure dissipation, and short durations of loading application, cyclic shear-induced Trang 2pore water pressure is accumulated For sandy soils at loose ... constituting of sand, sandy soils, and other materials (Tokimatsu and Katsumata, 2012; Bhattacharya et al., 2011), accompanied by excessive ground settlement up to 60 cm as well as the settlement and tilting...
Ngày tải lên: 19/10/2022, 15:50
Effects of long term use of sodic water irrigation, amendments and crop residues on soil properties and crop yields in rice–wheat cropping system in a calcareous soil
... The soil samples were air-dried, ground to pass through a 2-mm sieve The soil and irrigation water samples were analyzed for EC, pH, soluble and exchangeable cations and ESP following standard ... waters In non-calcareous saline-sodic and sodic soils, an increase in aqueous CO2results in production of H+ions and a corresponding decrease in soil pH In calcareous saline-sodic and sodic soils, ... soils – their reclamation and management for crop production Adv Soil Sci 12, 223–275. Jalali, M., Ranjbar, F., 2009 Effects of sodic water on soil sodicity and nutrient leaching in poultry and...
Ngày tải lên: 19/10/2022, 17:54
03 Water Soil Light and Socio Econ 2019 11 06 Public Wokshop _2
... Metric: WATER & SOIL Trang 2Project Objective and Study Area Objective: Collect and analyze data to identify overall changes in land use, vegetation cover, wetlands, water quality, and soil chemical ... Memorandum No 8 Technical Memorandum No 8 contains no water or soil quality/chemical analytical data but notes “Des Moines Creek violations of dissolved oxygen, bacteria, and copper” and ... plants, water, soils. Trang 26 Geographic Information System (GIS) – analyze layers for wetlands, streams, and soils data. National Pollutant Discharge Elimination System Groundwater Study...
Ngày tải lên: 22/10/2022, 21:00
Bridging effective stress and soil water retention equations in deforming unsaturated porous media: a thermodynamic approach
... unsaturated soils, a clear understanding of coupling between hydraulics and stress states of unsaturated soils is necessary On the one hand, the volume fraction of different phases (air, water and solid) ... of) the unsaturated soils, and wetting- and drying-induced volume changes in the expansive and collapsible soils This explains why the mechanical behaviour of unsaturated soils has been a subject ... clearly shown that soil water retention curves are dependent on the stress level (Romero and Vaunat 2000;Karube and Kawai 2001; Gallipoli et al 2003b;Tarantino and Tombolato 2005;Nuth and Laloui 2008;Tarantino...
Ngày tải lên: 19/11/2022, 11:46
nitrogen transportation and transformation under different soil water and salinity conditions
... 120, and 280 hours The soil mass content [g·g–1] was first measured by the oven method and then converted into volumetric moisture [cm3·cm–3], and the soil EC was measured in a 1 : 5 soil : water ... experimental data and (2) establish an empirical model to quantitatively describe the transformation of soil nitrogen in salt-affected soils Materials and methods Soil samples Soil samples were ... for investigating soil water and solute and the objectives of this study are to (1) evaluate the nitrogen transformation ratio Trang 3under the interaction of irrigation and soil salt using the...
Ngày tải lên: 04/12/2022, 15:38
Soil water repellency in red pine and hevea brasiliensis forest in thanh hoa province, viet nam
... increase in runoff and erosion A number of factors are believed to control the strength of soil water repellency such as fire, vegetation type, soil texture, soil moisture and time since burning ... the soil being tested and the investigator simply notes how long it takes until these water drops are absorbed into the soil ( Doerr, Shakesby and MacDonald, 2007) The samples were also taken and ... wettable, 5s - 30s = slight water repellency and >30s = moderate and high repellency (Hubbert and Oriol 2005) The measurement was replicated 10 times at each depth and if the water repellency was...
Ngày tải lên: 14/08/2023, 21:49
Báo cáo lâm nghiệp: "Effects of the clear-cutting of a Douglas-fir plantation (Pseudotsuga menziesii F.) on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters" pps
... plot scale to stream-water at the catch- ment scale), and the specific site conditions (soil and vege- tation types). Due to specific changes in solution chemistry occurring in the subsoil, the plot ... site) and regulated by the extractable soil water content and by the wetness of the foliage [25]; direct soil evap- oration (estimated from the global radiation decrease between open area and under ... between 15 and 30 cm, 10% between 30 and 60 cm and no roots below 60 cm) compared to the root distribution observed for trees (34% between 0 and 15 cm, 29% between 15 and 30 cm, 30% between 30 and 60...
Ngày tải lên: 07/08/2014, 16:20
Soil water monitoring
... of soil water statusGRAVIMETRIC, VOLUMETRIC AND POTENTIAL MEASURES There are three common ways to describe the wetness of soil: gravimetric soil water content (SWC), volumetric SWC, and soil water ... publication has been published by Land andWater Australia to assist public knowledge and discussion and help improve the sus-tainable management of land, water and vegetation Where technical informationhas ... definition of a soil water sensor: A soil water sensor is an instrument which, when placed in a soil for a period of time, vides information related to the soil water status of that soil (Cape 1997)....
Ngày tải lên: 07/04/2017, 15:46
Effects of Forest Degradation on Forest’s Soil Water Retention in Northern Vietnam
... [18]. B ulkD ensity soil depth, bulk density, and soil moisture (M a n oj,2011)[18]. Pịy {mm) = SoilDepth* BulkDensity* SoilMoist (3) Where: Pwr soil water retention (dm); Soil dq)th (mm); bulk ... space in a soil, it influences the m ovem ent o f water and defines amount o f water stored in a soil (Kimmins, 2 004) [19] Soil porosity varies among forest types At any soil depth, soil porosities ... 169Table 5 Averaged forest soil water retention from May 15 to July 15, 2007 Cover types Soil depth (m) Bulk density (g/cm^) Soil m oisture (%) Soil water retention^ (mm) “ Soil water retention is...
Ngày tải lên: 26/01/2021, 14:12
Effects of forest degradation on forest’s soil water retention in northern vietnam
... [18]. B ulkD ensity soil depth, bulk density, and soil moisture (M a n oj,2011)[18]. Pịy {mm) = SoilDepth* BulkDensity* SoilMoist (3) Where: Pwr soil water retention (dm); Soil dq)th (mm); bulk ... space in a soil, it influences the m ovem ent o f water and defines amount o f water stored in a soil (Kimmins, 2 004) [19] Soil porosity varies among forest types At any soil depth, soil porosities ... 169Table 5 Averaged forest soil water retention from May 15 to July 15, 2007 Cover types Soil depth (m) Bulk density (g/cm^) Soil m oisture (%) Soil water retention^ (mm) “ Soil water retention is...
Ngày tải lên: 17/03/2021, 20:19
Measurement of Soil Water Potential by Adsorption Conductivity
... in soil water research (50 pages) Trang 7INTRODUCTION The ability to measure the available water in the soil, soil water potential, simply and accurately has been sought after by scientists and ... with which the soil holds water This allows us to describe the water in the soil as the growing plant senses it the amount of energy required to remove water from the soil In viewing water relations ... this way, we are able to measure and manage water in the soil from the standpoint of the plant and the atmosphere that expend energy to remove water from the soil Thus, the total system can be...
Ngày tải lên: 23/10/2022, 20:51