Small scale variability of vertical water and dissolved organic matter fluxes in sandy Cambisol subsoils as revealed by segmented suction plates

Leinemann, Timo; Mikutta, Robert; Kalbitz, Karsten; Schaarschmidt, Frank; Guggenberger, Georg

doi:10.1007/s10533-016-0259-8

Cited by 31 publications

(61 citation statements)

References 55 publications

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“…It is likely that there was enough time for the injected DOC to be retained within the first 10 cm below the injection depth, since even a structureless sandy soil can have very low infiltration rates as it was shown by Flury et al (1994) with a dye infiltration experiment. This high retention potential of our investigated Sand is in agreement with studies from (Kalbitz et al 2004;Nielsen et al 1999) and was also apparent within field observations of Leinemann et al (2016). The latter authors could observe a strong decline of transported DOC of 94% within 150 cm soil depth.…”

Section: Amount and Distribution Of Injected Docsupporting

confidence: 93%

“…The soil at the first experimental site (near Nienburg (Weser), 51°34 0 41.34 00 N, 10°3 0 54.6192 E) was classified as a Dystric Cambisol developed on Pleistocene fluvial and aoelian sandy deposits and will be referred to as ''Sand'' in the following. The mean annual temperature at this site is 9.7°C and the annual precipitation amounts to 762 mm (Leinemann et al 2016). The soil at the second site (near Ebergötzen, 51°34 0 41.34 00 N, 10°3 0 54.6192 E) was a Dystric Cambisol, developed on Triassic upper red sandstone and therefore will be referred to as ''Red Sandstone'' in the following.…”

Section: Site Descriptionmentioning

confidence: 99%

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Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests

et al. 2020

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Dissolved organic carbon (DOC) from Oa horizons has been proposed to be an important contributor for subsoil organic carbon stocks. We investigated the fate of DOC by directly injecting a DOC solution from 13 C labelled litter into three soil depths at beech forest sites. Fate of injected DOC was quantified with deep drilling soil cores down to 2 m depth, 3 and 17 months after the injection. 27 ± 26% of the injected DOC was retained after 3 months and 17 ± 22% after 17 months. Retained DOC was to 70% found in the first 10 cm below the injection depth and on average higher in the topsoil than in the subsoil. After 17 months DOC in the topsoil was largely lost (-19%) while DOC in the subsoil did not change much (-4.4%). Data indicated a high stabilisation of injected DOC in the subsoils with no differences between the sites. Potential mineralisation as revealed by incubation experiments however, was not different between DOC injected in topsoil or subsoils underlining the importance of environmental factors in the subsoil for DOC stabilisation compared to topsoil. We conclude that stability of DOC in subsoil is primary driven by its spatial inaccessibility for microorganisms after matrix flow while site specific properties did not significantly affect stabilisation. Instead, a more fine-textured site promotes the vertical transport of DOC due to a higher abundance of preferential flow paths.

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Section: Amount and Distribution Of Injected Docsupporting

confidence: 93%

Section: Site Descriptionmentioning

confidence: 99%

Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests

et al. 2020

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“…Each suction plate was connected to a sample bottle. All 12 sample bottles were connected to the same vacuum pump to evacuate the sampling system at a constant (Leinemann et al, 2016) pressure head of −200 hPa. A 2.5‐ by 1.0‐m wooden collar was placed on the soil above the suction plates to allow precise irrigation and to prevent surface runoff.…”

Section: Methodsmentioning

confidence: 99%

Biogas Digestate Application Modifies Solute Transport Conditions in Soils and Increases the Release of Phosphorus

Koch

Kahle

Lennartz

2019

Vadose Zone Journal

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Core Ideas Severe rainfall events cause increased phosphorus release from soils. The proportion of DRP increases with increasing rainfall duration. Digestate application causes a 400‐fold increase in pore water P concentrations. The DRP fraction is clearly dominant immediately after fertilization. Digestate application facilitates a flux regime shift with preferential flow pathways. The application of fertilizers to soils may impair the quality of both surface and subsurface waters. Severe rainfall events that follow fertilizer application can increase P release from soils. In this study, suction plates were installed in a loamy soil with the aim of determining the P transport patterns and processes in the soil before and after the application of biogas digestate. Prior to the application of biogas digestate, the pore water concentrations of dissolved reactive P (DRP) were significantly lower than the total P (TP) concentrations, with DRP/TP ratios increasing from 0.03 to 0.89. After fertilizer application, the TP and DRP pore water concentrations increased 400‐fold. The DRP/TP ratio remained almost constant at 0.83. After 220 mm of precipitation, 4.5% of the P mass applied was leached to below the 50‐cm soil depth, indicating the general mobility of P in soils during high‐intensity rainfall. Brilliant Blue dye tracing experiments revealed that organic‐matter‐rich biogas digestate obviously changes the flow and transport patterns in soils from being homogenous to moderately heterogeneous, including preferential flow. Although the P loading across the flux plane had been equilibrated prior to treatment, after the application it was found to be concentrated in preferred transport regions. The emerging conclusion is that the risk of ground and subsequent surface water pollution with P after fertilization with biogas digestate originates not only from the applied P mass but also from the shift in the flow and transport regime caused by the organic‐matter‐rich slurry.

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“…Adsorption of OM on solid matrix iron oxide coatings, however, can facilitate the transport of negatively charged iron oxide colloids. The amount of injected DOC that was required to block all sorption sites in our soil sample was equivalent to 29.8, 78.7 and 157.5 years of natural DOC flux, which was measured by Leinemann et al (2016) at three positions at 50-cm depth at the sampling location. Therefore, in soil, the processes studied in our experiments are probably restricted to preferential flow paths for DOM if the rate of mineralization in the soil matrix is large compared with the rate of production of soil organic coatings.…”

Section: Implications For the Mobility Of Iron Oxide Colloids And Dommentioning

confidence: 99%

Effects of organic matter coatings on the mobility of goethite colloids in model sand and undisturbed soil

Carstens

Bachmann

Neuweiler

2017

European J Soil Science

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Summary The mobility of goethite (OMCG) colloids coated with organic matter was studied in goethite‐coated quartz sand and in undisturbed subsoil rich in natural coatings of iron oxide. Classic Derjaguin–Landau–Verwey–Overbeek (DLVO) interactions and DLVO extended by Lewis acid–base parameters (XDLVO) were estimated between colloids and goethite‐coated sand from zeta potentials and sessile drop contact angles. The OMCG colloids were retained completely in goethite‐coated sand, whereas preconditioning of the solid matrix with dissolved organic matter (DOM) enabled subsequent colloid transport. Zeta potential values showed that goethite‐coated sand was modified strongly by DOM preconditioning. The DLVO and XDLVO interactions were estimated for the pairs of OMCG colloids and for (i) quartz, (ii) goethite and (iii) organic matter‐coated goethite. Both DLVO approaches were able to predict general trends of colloid breakthrough. An exception was the XDLVO interaction for combination (iii), which showed short‐distance (<1.3 nm) repulsive interactions that were inconsistent with breakthrough behaviour. Analogous to OMCG colloid transport in the sand, DOM preconditioning was also the prerequisite for OMCG colloid transport in undisturbed subsoil. Total colloid breakthrough in the soil was less than in the sand, probably because of straining in pore throats and retention at air–water interfaces. We concluded that the DLVO and XDLVO approaches were in general capable of predicting trends of OMCG colloid mobility in goethite‐coated sand. We concluded further that the basic principles of OMCG colloid transport were transferrable from the simplified model system to the more complex natural system despite considerable differences in surface properties, pore structure and water content. Highlights How will organic matter (OM) coatings on the solid matrix affect mobility of iron oxide colloids? Effect of OM on mobility was assessed in simple model soil systems and in undisturbed soil. OM coatings modify properties of the solid matrix surface and are a prerequisite for colloid transport. Balances between OM transport, coating formation and decomposition control colloid mobility.

show abstract

Small scale variability of vertical water and dissolved organic matter fluxes in sandy Cambisol subsoils as revealed by segmented suction plates

Cited by 31 publications

References 55 publications

Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests

Fate and stability of dissolved organic carbon in topsoils and subsoils under beech forests

Biogas Digestate Application Modifies Solute Transport Conditions in Soils and Increases the Release of Phosphorus

Effects of organic matter coatings on the mobility of goethite colloids in model sand and undisturbed soil

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