搜索结果: 61-75 共查到“知识库 土壤化学”相关记录820条 . 查询时间(4.072 秒)
Field study of chlorotoluron transport and its prediction by the BPS mathematical model
chlorotoluron contaminant transport field study half-life degradation herbicides mathematical model BPS
2015/3/2
The chlorotoluron transport in the soil profiles was studied under field conditions on three different soil types of the Czech Republic. The herbicide was applied on 21. 4. 2005 on a four-square meter...
Influence of the degree of soil organic matter lability on the calcium carbonate equilibrium of soil water
calcium carbonate equilibrium degree of lability liming need soil organic matter soil water
2015/3/2
In average samples of three sandy-loamy acid Cambisols from a South Bohemian area labile organic matters were determined by the permangate method modified by the dichromate method, and the rate consta...
Laboratory assay of aluminium transport through intact soil sample under controlled conditions
aluminium transport forest soils forest type percolation experiment soil acidification
2015/3/2
Aluminium (Al) mobilisation in the forest soils is a serious problem due to the soil acidification. The rate and magnitude of leaching of Al and other elements and compounds from soils can be examined...
Assessment of Evapotranspiration Simulations in the Malše Basin
hydrologic modelling evapotranspiration sWIM model
2015/3/1
The application of the distributed hydrological model brings the benefits of assessment of the spatially
distributed quantities which are hard to measure in the field over a larger area, e.g. evapot...
Wetting angle and water sorptivity in mineral soils
sub-critical repellency Washburn theory wavy capillary
2015/2/3
Two simple models of a non-cylindrical (wavy) capillary have been applied to show the impact of pore shape and of wetting angle on water sorptivity in soils. Wetting angle derived from the Washburn ap...
Evaluation of the wind erosion risks in GIS
wind erosion wind barriers geographic information system digital terrain model land use
2015/1/30
The paper refers to the possibilities of the evaluation of the wind erosion risks by using a model created in GIS. The model exploits the pedological information database for determining the potential...
Revised soil erodibility K-factor for soils in the Czech Republic
water erosion soil erodibility soil structure permeability soil texture organic matter
2015/1/30
In the territory of the Czech Republic there are more than 50% of agricultural soils exposed to water erosion; it is a very urgent problem both at present and for the future. It must be solved now whe...
Molecular size distribution and hydrophilic and hydrophobic properties of humic acids isolated from forest soil
forest soil humic acids HPSEC hydrophobic fractions hydrophilic fractions
2015/1/30
The aim of the present paper was to determine hydrophilic and hydrophobic properties and the degree of polydispersity of humic acids depending on their degree of maturity and the properties of the pla...
Altitude and forest type effects on soils in the Jizera Mountains region
forest soils altitude forest type beech spruce elevation transects
2015/1/30
This paper is focused on the Jizera Mountains as a region strongly influenced by man in the past. The structure of the natural forest was changed. Species monocultures with similar tree ages were plan...
Survey of efficiency of erosion and flood control measures at the Němčicky stream
sheet water erosion flood extreme rainfall – runoff events protective measures efficiency complex land use adjustment ERCN
2015/1/30
The article presents the initial part of the research of the efficiency of erosion and flood control measures designed in the experimental basin of the Němčicky stream. A long term observation of...
Stand heterogeneity of total carbon and nitrogen, and C/N ratio in soil of mountain meadows
carbon nitrogen C/N ratio mountain meadow
2015/1/30
This study was aimed at monitoring the relative and absolute stand heterogeneity of total carbon, total nitrogen and C/N ratio in Ah-Ae-Btg-Bt horizons of Gleyic Luvisol on one mountain meadow divided...
Phosphorus fractions in arable and mountain soils and their humic acids
inorganic P organic P soil types humic acids 31P NMR
2015/1/30
Soil phosphorus (P) can exist in various inorganic (Pi) and organic forms (Po). Specific determination of Pi can be obtained by fractionate methods. However, the discrimination between the chemically ...
Thermodynamics of copper desorption from soils as affected by citrate and succinate
kinetics thermodynamic parameters low molecular weight organic acids
2015/1/30
Desorption of Cu and low molecular weight dissolved organics are the primary factors that impact fate and transport of Cu in soils. To improve predictions of the toxicity and threat from Cu contaminat...
Sediment Load and Suspended Sediment Concentration Prediction
sediment concentration sediment yield sediment delivery ratio soil erosion water quality European catchments
2015/1/28
Sediment is a natural component of riverine environments and its presence in river systems is essential. However, in many ways and many places river systems and the landscape have been strongly affect...
Object-oriented Fuzzy Analysis of Remote Sensing Data for Bare Soil Brightness Mapping
remote sensing soil colour digital soil mapping fuzzy analysis fuzzy membership function
2015/1/28
Remote sensing data have an important advantage; the data provide spatially exhaustive sampling of the area of interest instead of having samples of tiny fractions. Vegetation cover is, however, one o...