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Focus Topic: Transport of chemicals in the vadose zone

critical zone

Focus Topic: Transport of chemicals in the vadose zone

Chemical processes and the transport of substances in soils is vital for the functioning of living organisms systems in soils. It also plays an important role for nutrient uptake of plants, the fate of pesticides and fertilizers, and the transformation and transport behavior of contaminants in soil. In general, transport and chemical processes in the vadose zone play a role in a broad range of studies. We collect here only papers with a clear focus on observations or modeling of coupled transport and chemical transformation processes of substances in soils. 

 
Michelle A. Walvoord, Brian J. Andraski, Christopher T. Green, David A. Stonestrom and Robert G. Striegl
A gas-tracer test in a deep arid unsaturated zone demonstrates that standard estimates of effective diffusivity from sediment properties allow a reasonable first-cut assessment of gas contaminant tran...more
 
Yasser Refaey, Boris Jansen, Abdel-Hamid El-Shater, Abdel-Aziz El-Haddad and Karsten Kalbitz
Adsorption of tested heavy metals on Egyptian soils was large in all situations tested and follows the order: Cu >> Ni ≈ Zn. Copper was influenced by the timing of dissolved organic matter add...more
 
Inne De Troyer, Roel Merckx, Fien Amery and Erik Smolders
Soil solution DOC concentrations were measured in 87 contrasting agricultural topsoils. The DOC concentrations are largely affected by drying–rewetting of the soils. In freshly sampled soils, DOC co...more
 
Boris Jansen, Karsten Kalbitz and William H. McDowell
The guest editors introduce the contributions to the special section, Dissolved Organic Matter in Soil, with a focus on the three main directions in this complex and growing research effort.Dissolved...more
 
L. Jeanneau, A. Jaffrezic, A.-C. Pierson-Wickmann, G. Gruau, T. Lambert and P. Petitjean
Spatio-temporal changes in the molecular composition of soil dissolved organic matter were investigated in a lowland catchment. The distribution of molecular markers was correlated to bulk-scale descr...more
 
Nele Van Gaelen, Dries Verheyen, Benedicta Ronchi, Eric Struyf, Gerard Govers, Jan Vanderborght and Jan Diels
An extensive sampling study identified the transport pathways of dissolved organic C to the surface water in contrasting catchments. An end-member mixing analysis revealed that the transport pathways...more
 
Thimo Klotzbücher, Klaus Kaiser and Karsten Kalbitz
Dissolved organic matter (DOM) from organic layers is the main source of organic matter entering forest mineral soils. Increasing throughfall—one possible consequence of climate change—did not aff...more
 
Ramya Thangarajan, Saikat Chowdhury, Anitha Kunhikrishnan and Nanthi Bolan
The dissolved organic matter (DOM) in wastewater streams provides C and nutrients, thereby influencing the priming effect (PE) of soil organic matter. The DOM-induced changes in the PE, which depend o...more
 
Axel Lamparter, Joerg Bachmann, Susanne K Woche and Marc-O. Goebel
The effect of organic matter sorption and microbial activity on sand particle wettability was investigated. Wettability generally decreased after sorption of organic matter. Low C/N ratios suggest tha...more
 
Angélica Vázquez-Ortega, Selene Hernandez-Ruiz, Mary Kay Amistadi, Craig Rasmussen and Jon Chorover
Natural organic matter is subjected to kinetic exchange on Al and Fe oxy(hydroxide) coated sand surfaces during laboratory experiments.Sorptive retention of dissolved organic matter (DOM) at soil part...more