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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • Aggregation and soil organic carbon fractions under different land uses on the tableland of the Loess Plateau of China
  • Aggregate ; China ; Cultivated land ; Forest ; Grassland ; Land use ; Organic materials ; Shaanxi ; Soil properties
  • In this study, the AA. examined the effects of 5 land uses (farmland, natural grassland, shrub forestland, arbor-shrub mixed forestland and arbor forestland) on soil aggregation and soil organic carbon (SOC) fractions on the Loess Plateau (Maliantan
  • Farm of Yongshou County in Shaanxi province). It is highlighted that : Aggregates SOC and easily oxidizable organic carbon (EOC) in grassland and forestland were higher than in farmland; SOC and EOC in farmland concentrated in < 1 mm macro-aggregates
  • , in others in > 1 mm; EOC tended to concentrate in larger aggregates than SOC. So converting slope cropland to forestland and grassland could improve the storage and quality of SOC, and the tendency of SOC transfer.
  • 2014
  • Distribution of nitrifiers and nitrification associated with different sizes of aggregates along a 2000 year chronosequence of rice cultivation
  • Aggregate ; Agropedology ; Biogeochemistry ; China ; Chronosequence ; Geochemistry ; Nitrifier ; Rice cultivation ; Soil properties ; Zhejiang
  • Soil aggregation, distribution patterns of ammonia-oxidizing bacteria (AOB) and ammonia oxidizing archaea (AOA) associated with different sizes of aggregates, and nitrification were studied for sites, located in Cixi, Zhejiang Province, under a 300
  • , which coincided with nitrifier populations. A long duration of intensive rice cultivation history depressed nitrifier populations and nitrification rates at both whole soil scale and aggregate scale.
  • 2014
  • Post-fire evolution of water repellency and aggregate stability in Mediterranean calcareous soils : A 6-year study
  • Aggregate ; Andalusia ; Cádiz ; Fire ; Mediterranean area ; Málaga ; Repellency ; Resilience ; Soil ; Soil properties ; Spain
  • The AA. study the evolution of soil water repellency (WR) and aggregate stability (AS)during a 6-year period after a wildfire in Mediterranean calcareous loamy to clayey soils from SW Spain. They have investigated 1) the fire-induced changes on soil
  • WR and AS in the medium term (6-year period after burning) and its distribution within aggregate size fractions, 2) the relations between post-fire AS and WR, and 3) the interactions between AS, WR and different factors (site, time since burning
  • aggregates (0.25–1 mm) after 6 years, and that aggregate stability was not affected severely by moderate-severity burning. Moreover, high soil resilience to low-moderate fire disturbance was observed.
  • 2014
  • Local politics and economic geography : information aggregation and polarization
  • This article considers information aggregation in national and local elections when voters are mobile and might sort themselves into local districts. Using a standard model of private information for voters in elections in combination with a new
  • 2014
  • Aggregate and regional house price to earnings ratio dynamics in the UK
  • This paper examines the time-series properties of house price to earnings ratio (HPER) in the UK using aggregate and regional data. Specifically, it utilizes a series of unit root tests to examine the null hypothesis of nonstationary HPERs
  • 2014
  • Aggregate ; Agropedology ; China ; Compaction ; Cultivated land ; Experimentation ; Shanghai ; Soil improvement ; Soil moisture ; Soil properties
  • . 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.
  • 2014
  • Aggregate ; Agricultural practice ; Agropedology ; Compaction ; Impact ; Krigeage ; Porosity ; Soil ; Soil moisture ; Soil properties ; Spatial distribution ; Traffic ; Turkey
  • This study was carried out, at the Ataturk University Research Farm in the Erzurum Plain, to determine the effects of field traffic operations on the changes in spatial variability of soil aggregate stability (AS), bulk density (BD), total porosity
  • 2014
  • Aggregate ; Digital elevation model ; Methodology ; Micro-topography ; Soil ; Soil properties
  • The aim of this study is to propose and discuss some methods dedicated to the automatic localization of clods (or big aggregates) on Digital Elevation Model images of soil. Two new image processing methods are introduced. The first one deals
  • 2014
  • The aim of this work is to evaluate the effect of rice husk biochar (RHB) and coal fly ash (CFA) on the formation and stability of aggregates, pore size distribution, water retention, swell–shrinkage, consistency limit, and tensile strength
  • of an expansive clayey soil (Vertisol). Results indicate that : the RHB promotes the formation of macroaggregates and resists aggregate slaking; RHB and CFA change the pore size distribution and increase larger pores of soil; RHB and CFA decrease the tensile
  • 2014
  • glaciaires se sont avancées et ont reculé au cours des 120 000 ans passés. L'amplitude verticale des variations de niveau marin s'élève à 130 mètres et l'espace mondial agrégé de l'Aquaterra équivaut au continent nord-américain. La période coïncide avec le
  • 2014
  • and technological change. Analysis of sectoral data shows marked differences in productivity performance; and aggregate productivity growth is driven by intra-sectoral productivity dynamics rather than by structural change.
  • 2014
  • problème des petits nombres lié à l’utilisation des données brutes issues de cette source. Elle consiste à agréger les communes selon un découpage territorial simplifié, et à lisser les séries à l’aide de moyennes mobiles triennales. La discussion se base
  • 2014
  • ) active, where bare sand averages more than 80 percent of the dune surface and sand patches are close together; (2) composite, with about 50 percent bare sand area and sand patches that are close together and of minimal complexity; (3) aggregated, where
  • 2014
  • was carried out at Tijuco Preto rural community in Prudentópolis municipality, southern Brazil. It is highlighted that chemical changes only occurred to a depth of 2.5 cm in the topsoil, and that aggregate stability tended to decrease only to a depth of 2.5 cm
  • 2014
  • Dans ce numéro spécial consacré à la récession, à la reprise et la résilience, on trouvera les articles suivants : 1-Estimation of local employment growth: do sectoral aggregation and industry definition matter? ;2-Synergy and co-agglomeration
  • 2014
  • areas ranked as advantaged, depending on the index and level of spatial aggregation. The results suggest that the use of Socio-economic Indexes for Areas as a proxy for individual level disadvantage is highly problematic at both a theoretical
  • 2014
  • Agglomeration ; Externalities ; Human capital ; Labour ; Local labour market ; Model ; Productivity ; Spatial aggregation ; Sweden ; Urban density ; Wage
  • 2014
  • to capture different types of aging communities in diverse contexts (e.g. depopulated rural areas, pockets of aging communities in urban areas, and growing concentrations of aging population in the suburbs). The analysis uses data sets aggregated at different
  • 2014
  • d'avantages fiscaux aux sociétés améliore le bien-être des citoyens et de l'attractivité pour les entreprises. On peut appliquer des méthodes de la qualité de la vie à des données agrégées issues de petits espaces. Les avantages fiscaux offerts par le
  • 2014