Mapping of Spatial Distribution of Soil Salinity and Alkalinity in a Semi-arid Region

• Autorzy: Keshavarzi A. , Sarmadian F.

Warianty tytułu

PL

Mapowanie przestrzennej zmienności zasolenia na obszarach o klimacie półsuchym

• Języki publikacji: EN

Abstrakty

EN

Spatial variability of salinity and alkalinity is important for site-specific management since they are the most important factors influencing soil quality and agricultural production. Geostatistical methods provide a means to study the heterogeneous nature of spatial distributions of soil salinity and alkalinity. The present study was carried out to evaluate the accuracy of different spatial interpolation methods including kriging, cokriging and IDW methods for prediction of spatial distribution of salinity (EC) and sodium adsorption ratio (SAR) in soils of Ziaran region in Qazvin province, Iran. The tracking of the soil profi les was done using a Garmin eTrex-H model global positioning system (GPS) receiver. Sampling was done with stratifi ed random method and sixty soil samples from 0 to 15 cm depth were collected. After data normalization, the variograms were developed. For selecting the best model for competing on experimental variograms, the lower RSS value was used. Experimental variograms were fitted to spherical and exponential models. The best model for interpretative was selected by means of cross validation and error evaluation methods, such as RMSE method. The sum of Ca2++ Mg2+ and Na+ concentration which were highly correlated with soil salinity and sodium adsorption ratio, respectively, are used as auxiliary parameters in this study. The results showed that kriging and cokriging methods were better than IDW method for prediction of EC and SAR. Finally, the soil EC and SAR maps were prepared, using different spatial interpolation methods in GIS environment.

PL

Artykuł przedstawia zastosowanie metod geoinformacyjnych do określania przestrzennej zmienności zasolenia zasadowości gleb wykształconych w klimacie półsuchym. Omówiono zastosowanie popularnych technik interpolacyjnych – metody ważonych odwrotnych odległości (Inverse Distance Weighted – IDW) oraz metod geostatystycznych krigingu i kokrigingu. W pracy przedstawiono analizę błędów map wynikowych wykonanych różnymi metodami interpolacyjnymi. Metody geostatystyczne – kriging i kokriging – wykazały większą dokładność w porównaniu do metody IDW.

Słowa kluczowe

EN

semi-arid region; salinity distribution; salinity variation; soil salinity; alkalinity; spatial distribution; sodium adsorption ratio; mapping

• Wydawca: -
• Czasopismo: Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
• Rocznik: 2012
• Tom: 44
• Numer: 1
• Opis fizyczny: p.3-14,fig.,ref.

Twórcy

autor

Keshavarzi A.

• Department of Soil Science Engineering, University of Tehran, Teheran, Iran

autor

Sarmadian F.

• Department of Soil Science Engineering, University of Tehran, Teheran, Iran

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