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| 1 | Soil salinity prediction in the Lower Cheliff plain(Algeria) based on remote sensing and topographic feature analysis显示文摘Soil salinity and ground surface morphology in the Lower Cheliff plain(Algeria) can directly or indirectly impact the stability of environments. Soil salinization in this area is a major pedological problem related to several natural factors, and the topography appears to be important in understanding the spatial distribution of soil salinity. In this study, we analyzed the relationship between topographic parameters and soil salinity, giving their role in understanding and estimating the spatial distribution of soil salinity in the Lower Cheliff plain. Two satellite images of Landsat 7 in winter and summer 2013 with reflectance values and the digital elevation model(DEM) were used. We derived the elevation and slope gradient values from the DEM corresponding to the sampling points in the field. We also calculated the vegetation and soil indices(i.e. NDVI(normalized difference vegetation index), RVI(ratio vegetation index), BI(brightness index) and CI(color index)) and soil salinity indices, and analyzed the correlations of soil salinity with topography parameters and the vegetation and soil indices. The results showed that soil salinity had no correlation with slope gradient, while it was significantly correlated with elevation when the EC(electrical conductivity) values were less than 8 d S/m. Also, a good relationship between the spectral bands and measured soil EC was found, leading us to define a new salinity index, i.e. soil adjusted salinity index(SASI). SASI showed a significant correlation with elevation and measured soil EC values. Finally, we developed a multiple linear regression for soil salinity prediction based on elevation and SASI. With the prediction power of 45%, this model is the first one developed for the study area for soil salinity prediction by the combination of remote sensing and topographic feature analysis. | Ibrahim YAHIAOUI Abdelkader DOUAOUI ZHANG Qiang Ahmed ZIANE | 2015 | Journal of Arid Land2015，7，6： | 9 |
| 2 | Geochemical characterization of the salinity of irrigated soils in arid regions(Biskra, SE Algeria)显示文摘The agriculture in Biskra,southeastern Algeria,is based on traditional practices and characterized by small irrigated fields.In the last decades,the increasing demand in water as well as the scarcity of rainfall has forced many farmers to use groundwater of low quality to maintain the profitability of their crops.Unfortunately,this practice seems to be the main harmful factor for soil quality in the region since it is responsible for the salinization of the irrigated areas.Aiming to assess the impact of this phenomenon,the soils of the irrigated perimeter of El Ghrous-a representative rural community located in the west of Biskra-have been analyzed.A set of 82 soil samples was collected from top and subsoil(0-15 and15-35 cm respectively),on which the following physicochemical analyzes were performed:Ca^(2+),Mg^(2+),K^(+),Na^(+),Cl^(-),SO_(4)^(2-),HCO_(3)^(-),NO_(3)^(-),pH,electrical conductivity(EC)and sodium adsorption ratio.A Principal Component Analysis was performed to individuate the geochemical processes that influenced significantly the evolution of soil salinity and its pathways.The results showed a calcium sulfate(CaSO_(4))facies with a high risk of salinity and a low to medium risk of alkalinity.The calcite residual alkalinity and generalized residual alkalinity decreased as the solutions became more concentrated.Most of the samples were oversaturated in carbonate minerals(aragonite,calcite,and dolomite)and under saturated in evaporitic minerals(anhydrite,gypsum,and halite).Finally,two multiple linear regressions(using cations and anions as independent variables)have been proposed to quantify soil salinity.These equations,with an accuracy of 85%,can represent a time and money-saving tool for managers and farmers to estimate the EC,in comparison to the traditional estimation methods. | Mohamed Amine Abdennour Abdelkader Douaoui Jesus Barrena Manuel Pulido Abdelhamid Bradai Amel Bennacer Chiara Piccini Alberto Alfonso-Torreno | 2021 | Acta Geochimica2021，40，2： | 2 |
| 3 | Spatial prediction of topsoil salinity in the Chelif Valley, Algeria, using local ordinary kriging with local variograms Versus whole-area variorum显示文摘 | Walter C MeBratney A B Douaoui A | 2001 | Australian Journal of Soil Research2001，39，2： | 1 |
| 4 | Fundamental Procedural Guarantees of Parties to a Mini-trial 显示文摘 | Malika-Diana Douaoui | 2000 | International Business Law Journal2000，，5： | 1 |
| 5 | Spatial prediction of topsoil salinity in the Chelif Valley,Algeria,using local ordinary kriging with local variograms versus whole-area variogram显示文摘 | Walter C McBratney AB Douaoui A | | 0，，02： | 1 |
| 6 | Spatial prediction of topsoil salinity in the Chelif Valley, Algeria, using local ordinary kriging with local variograms versus whole-area variogram显示文摘 | Walter C McBratney A B Douaoui A | 2001 | Australian Journal of Soil Research2001，39，2： | 1 |
| 7 | Detecting salinity hazards within a semiarid context by means of combining soil and remote-sens- ing data显示文摘 | Douaoui A E K Nicolas H | 2006 | Geoderma2006，134，： | 1 |
| 8 | Some Problems of Irrigation Water Management in Lower Cheliff Plain (Algeria)显示文摘 | Abdelhamid BradaI Abdelkader Douaoui Tarik Hartani | 2012 | Journal of Environmental Science and Engineering(A)2012，1，3： | 1 |
| 9 | Detecting salinity hazards within a semiarid context by means of combining soil and remote-sensing data显示文摘 | Douaoui A K Nicolas H Walter C | 2006 | Geoderma2006，134，12： | 1 |
| 10 | Detecting salinity hazards within a semiarid context by means of combining soil and remote-sensing data显示文摘 | Abd El Kader Douaoui | 2006 | Geoderma2006，134，： | 1 |
| 11 | Detecting salinityhazards within a semiarid context by means of combining soil andremote-sensing data显示文摘 | DOUAOUI A E K NICOLAS H WALTER C | 2006 | Geoderma2006，134，： | 1 |
| 12 | Detecting salinity hazards within a semiarid context by means of combining soil and remote-sensing data显示文摘 | Douaoui A E K Nicolas H Walter C | 2006 | Geoderma2006，，134： | 1 |
| 13 | Detecting salinity hazards within a semiarid context by means of combining soil and remote-sensing data显示文摘 | Abd E1 Kader Douaoui Herve Nicolas Christian Waiter | 2006 | Geoderma2006，134，： | 1 |
| 14 | Detecting salinity hazards within a semiarid context by means of combining soil and remote-sensing data显示文摘 | Abd E1 Kader Douaoui Herve Nicolas Christian Waiter | 2006 | Geoderma2006，134，12： | 1 |
| 15 | Detecting salinity hazards within a semiarid context by means of combining soil and remote - sensing data 显示文摘 | Douaoui A E K Nicolas H Walter C | 2006 | Geod2006，134，12： | 1 |
| 16 | Exploring Salinity Perception in Lower Cheliff Plain (Algeria)显示文摘 | Tarik Hartani Abdelhamid Brada Abdelkader Douaoui | 2012 | Journal of Agricultural Science and Technology(A)2012，2，11： | 0 |
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