The aim of this study was to determine the effects of diatomite application on physical characteristics of soils with different textures (sandy loam, loam, and clay), under laboratory conditions. The results indicated that diatomite applications
significantly increased aggregate stability of all the experimental soils in all aggregate size fractions and also soil moisture content at field capacity in Sandy Loam textured soil. Therefore it is suggested that the diatomite may be considered as a soil
amendment agent for improving soil physical characteristics.
[b1] Fac. of Agriculture, Dep. of SoilScience, Atatürk Univ., Erzurum, Turquie
Comparison of international, national and farmers'classification systems, applied to soils of the Western Dagomba District
Agropedology ; Crop yield ; Environmental management ; Farmer ; Ghana ; Land use ; Soil ; Soil classification ; Soil properties ; Sustainable development ; Taxonomy
Selected soils developed on the Voltaian Shale formation have been studied. Classification of a vertic and a lateritic soil is compared in 4 systems : 1) Soil Taxonomy (Soil Survey Staff 1996), 2) FAO-UNESCO (1990), 3) the Ghanaian soil
classification system (Brammer 1962), and 4) the local Farmer's classification system (Mikkelsen 1994). The comparison deals with the quantity and quality of information provided by each classification name. It is recommended that soil surveys should make
Soil aggregation, aggregate stability, organic carbon and nitrogen in different soil aggregate fractions under forest and shrub vegetation on the Loess Plateau, China
Aggregate ; Carbon ; China ; Geophysics ; Land use ; Loess ; Microstructure ; Nitrogen ; Plateau ; Soil properties ; Vegetation
. Therefore, the aims of this study were to elucidate the effects of different plant communities on soil aggregate stability and the distribution of organic carbon and nitrogen in different aggregate fractions by using ultrasonic method, both in old forest
areas and in new afforestation areas, in order to prove that the different plant covers enhance soil aggregate stability. Soil samples were collected from the hilly-gully area on the Loess Plateau : results and discussion.
[b2] Inst. of Soil and Water Conservation, Chinese Academy of Science, Shaanxi, Yangling, Chine
[b3] Inst. of SoilScience, Dep. of Forest and SoilSciences, Univ. of Natural Resources and Applied Life Sciences, Wien, Autriche
[b1] State Key Lab. of Soil Erosion and Dryland Farming on Loess Plateau, Northwest Univ. Shaanxi, Yangling, Chine
[b4] Inst. of Physics and Materials Science (IPM), Dep. of Materail Sciences and Process Engineering, Univ. of Natural Resources and Applied Life Sciences, Wien, Autriche
Soils in the Mediterranean region: what makes them different?
Special Issue. Red Mediterranean soils
Aeolian dust ; Arid area ; Aridity ; Carbonate ; Clay mineral ; Deforestation ; Global change ; Human impact ; Lateritic soil ; Mediterranean area ; Pedogenesis ; Red soil ; Soil ; Soil classification ; Soil properties ; Taxonomy
At least 4 attributes make the Mediterranean world indeed different and largely determine the nature of its soils: specific climate, its mountains, dust from the desert, and the long term effects of man. Space limitation allows only a brief
[a1] Dept. of SoilScience, University of Saskatchewan, Saskatoon, Canada
[b1] Institute of Earth Sciences, Hebrew University, Jerusalem, Israel
Comparison of the surface chemical properties of four soils derived from Quaternary red earth as related to soil evolution
China ; Clay mineral ; Geochemistry ; Soil ; Soil classification ; Soil properties ; Southern China ; Subtropical zone ; Weathering
The surface chemical properties of soil samples i.e., surface charge and zeta potential, and the mineralogy of soil clay fraction were investigated with reference to soil weathering extent for 4 different soils derived from Quaternary red earth
using the ion adsorption method, a micro-electrophoresis method and the X-ray diffraction analysis. Results indicated that all these soil samples, 4 ultisols collected respectively from Liuzhou, Guangxi, Changsha and Hunan Province, contained kaolinite
and gibbsite. It is showed that the magnitudes of the point of zero salt effect (PZSE), the isoelectric point (IEP) and zeta potential of these soils were in agreement with the weathering extent of the soils and can be employed as reference criteria
for classification and evolution of soils.
[b1] State Key Lab. of Soil and Sustainable Agriculture, Inst. of SoilSciences, CAS, Nanjing, Chine
[b2] Graduate Univ. of Chinese Academy of Sciences, Beijing, Chine
The profile described at Tongres contains three buried soils, dating from the end of the marine part of the Tongeren Formation. On granulometrical, mineralogical, chemical and micromorphological grounds, the author classifies them, decreasing in age
, as a podzol (possibly Haplorthod), a second podzol (possibly Duraquod) and a cat-clay soil (Sulfaquept).
Spatially explicit simulation of soil organic carbon dynamics in China's paddy soils
Carbon ; Carbon sequestration ; China ; Climatic change ; Cultivated land ; Greenhouse effect ; Model ; Rice cultivation ; Soil ; Soil properties ; Space time
To reduce uncertainties from upscaling spatial processes of the DeNitrification-DeComposition (DNDC) model for improving the definition of China's paddy soils SOC stocks (0-30 cm) and their changes from 1980 to 2008, a soil polygon-based modeling
method was developed by integrating DNDC with the latest 1:1,000,000 soil database, derived from 1490 paddy soil profiles collected during the Second National Soil Survey of China. There were, however, large regional differences in sequestration outcomes
. Increases in paddy soil SOC stocks were found predominantly in South, Eastern and Southwest China. Enhancement in the soil databases with higher resolution inputs should improve the C sequestration estimates of any area of interest.
[b1] State Key Lab. of Soil and Sustainable Agriculture, Inst. of SoilSciences, CAS, Nanjing, Chine
[b2] Graduate Univ. of Chinese Academy of Sciences, Beijing, Chine
[b3] School of Geodesy and Geomatics, Anhui Univ. of Science and Technology, Huainan, Chine
Soil moisture was measured over a four-month period at 31 sample points on a 1 ha clear-cut site on southern Vancouver Island. The data were used to determine spatial and temporal variations in soil moisture, and to infer the most likely mechanism(s
) of soil-water movement vertically through the soil profiles and laterally across the site. All soils showed an increase in moisture content through the monotoring period. This zone of increased soil moisture was correlated with the main root zone
This paper evaluates the effects of rice-husk ash with different rates of 0%, 10%, 20%, and 30% (v/v) on soil consistency limits (liquid limit, plastic limit) and soil compactibility parameters in Shanghai soils with different textures
. It is highlighted that RHA increases the optimum moisture content (OMC) of soil, and decreases the soil compactibility. It is concluded that RHA promotes the aggregate stability, thus improves the workability of soil.
[b1] Univ. of Shanghai for Science and Technology, Environmental and Architectural College, Shanghai, Chine
The soils were surveyed, described and examined at a remote forested high-elevation site of the Bavarian Forest (Germany). They derive from periglacial gneiss debris consisting of an upper, loose stratum and an indurated zone below. The different
hydraulic conductivity of both layers has important effects on the dynamics of water and nutrient elements, and thus on soil development.
were applied on field scale for preliminary investigation of variation of different soil properties. Thirteen physical and chemical soil variables were surveyed.
The use of cesium-137 measurements of soil erosion and farmers' perception to indicate land degradation amongst shifting cultivators in northern Thailand
Erosion on steep slopes in Chiang Rai province was measured for the 1963-1991 period. Not all of the erosion was from cultivation. And erosion may not be the most relevant factor in reducing soil fertility. - (DWG)
A sampling strategy for quantitative soil survey includes two different samplings : (i) a reconnaissance sampling to characterize the variogram required to optimize the sampling scheme for (ii) the actual survey. For the actual survey a sampling
spacing of 2 km in a square grid was found to result in an acceptable maximum kriging estimation error of 5,76 %. The proposed sampling strategy would require 408 observations in total. This is 71 % less than the sampling during the National Soil Survey.
Apparent thermal diffusivity in soil: estimation from thermal records and suggestions for numerical modeling
Geophysics ; Methodology ; Model ; Soil ; Soil properties ; Soil temperature ; Sweden ; Temperature
The concept of apparent thermal diffusivity in soil is discussed and defined as consisting of an intrinsic and a pseudo part. A method that uses a numerical model of heat conduction and measured soil temperatures to estimate apparent thermal
[b1] Dept. of Physical Geography, Earth Sciences Center, Göteborg University, Göteborg, Suede
This paper describes the development of such a soil description system for burial mounds primarily based on borings on both protected and unprotected barrows. It is intended for characterizing various types of significant information for both
This study evaluates the effect of soil organic matter on soil structure stability under different soil management practices in Rendzic Leptosol, in an extremely humid year. In 2006, an experiment of the different management practices
in a productive vineyard was established in the locality of Nitra-Dražovce (Slovakia). Soil samples were collected every month, during the year 2010. The results showed that the aggregation process and soil structure stability were mainly dependent on the stable
form of soil organic matter or the physically protected soil organic matter inside of aggregates in all soil management practices in a vineyard. In the treatment with plowed farmyard manure, the soil structure stability decreased, during 2010
. In this case, humic substances stability had a statistically significant influence on soil structure stability. The lower the values of color quotient of humic substances in soil were, the lesser was the decrease in soil structure stability.
[b1] Dep. of SoilScience, Fac. of Agrobiology and Food Resources, Slovak Univ. of Agriculture, Nitra, Slovaquie
[b2] Dep. of Chemistry, Fac. of Biotechnology and Food Sciences, Slovak Univ. of Agriculture, Nitra, Slovaquie