Short-term carbon mineralization in saline–sodic soils

Setia, Raj; Setia, Deepika; Marschner, Petra

doi:10.1007/s00374-011-0643-4

Cited by 14 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some studies report increased carbon mineralization and increased C emissions (Weston et al 2006;Chambers et al 2011;Weston et al 2011;Morrisey et al 2014). Other studies, however, do not show a significant effect of salinization on C emissions (Hemminga et al 1991;Setia et al 2012), or even report decreasing C emissions (Loeb et al 2008;Setia et al 2010). For methanogenesis and methane (CH 4 ) emissions, however, most studies consistently report a decrease due to salinization (Baldwin et al 2006;Weston et al 2006;Chambers et al 2011).…”

Section: Introductionmentioning

confidence: 92%

Salinization of coastal freshwater wetlands; effects of constant versus fluctuating salinity on sediment biogeochemistry

et al. 2015

View full text Add to dashboard Cite

Globally, coastal lowlands are becoming more saline by the combined effects of sea level rise, land subsidence and altered hydrological and climatic conditions. Although salinization is known to have a great influence on biogeochemical processes, literature shows contrasting effects that challenge the prediction of future effects. In addition, the effects of fluctuating salinity levels, a more realistic scenario than constant levels, on nutrient cycling in coastal wetland sediments have hardly been examined. A better understanding is therefore crucial for the prediction of future effects and the definition of effective management. To test the effects of constantly brackish water (50 mmol Cl l -1 , 3.2 psu) or fluctuating salinity (5-50 mmol Cl l -1 ), versus constantly low salinity (5 mmol Cl l -1 , 0.32 psu) on nutrient biogeochemistry, we conducted a controlled laboratory experiment with either peat or clay sediments from coastal wetlands. Increased salinity showed to have a fast and large effect. Sediment cation exchange appeared to be the key process explaining both a decrease in phosphorus availability (through calcium mobilization) and an increase in nitrogen availability, their extent being strongly dependent on sediment type. Supply of brackish water decreased surface water turbidity and inhibited sediment methane production but did not affect CO 2 production. Constant and fluctuating salinity levels showed similar longer term effects on nutrient and carbon cycling. The contrasting effects of salinization found for nitrogen and phosphorus, and its effects on water turbidity indicate major ecological consequences for coastal wetlands and have important implications for water management and nature restoration.

show abstract

Section: Introductionmentioning

confidence: 92%

Salinization of coastal freshwater wetlands; effects of constant versus fluctuating salinity on sediment biogeochemistry

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Factors affecting CO 2 emission from saline and saline‐sodic soils have been correlated with soil properties including, osmotic potential and sodium adsorption ration (Setia et al ., ; Setia et al ., ; Setia et al ., ), soil texture (Chowdhury et al ., ; Mavi et al ., ) and water content (Setia et al ., ), soil organic carbon stocks (Setia et al ., ), and residue composition and water potential (Setia et al ., ; Setia & Marschner, 2013a; Setia & Marschner, 2013b). Several other researchers have also investigated the effect of salinity and sodicity on SR (CO 2 evolution) in laboratory (Pathak & Rao, ; Beltrán‐Hernández et al, ; Wong et al ., , 2009) and field studies (Chander et al ., ; Rietz & Haynes, ; Yuan et al ., ; Singh et al ., ).…”

Section: Microbial Activities In Saline and Sodic Soilsmentioning

confidence: 99%

“…This artificially created salinity may or may not be an actual factor for changes in microbial activities especially at early stages of incubation study and may not be that much similar to natural field conditions (Macci et al, 2013). Factors affecting CO 2 emission from saline and salinesodic soils have been correlated with soil properties including, osmotic potential and sodium adsorption ration (Setia et al, 2010;Setia et al, 2011b;Setia et al, 2011c), soil texture (Chowdhury et al, 2011c; and water content (Setia et al, 2011a), soil organic carbon stocks (Setia et al, 2012a), and residue composition and water potential (Setia et al, 2012b;Setia & Marschner, 2013a;Setia & Marschner, 2013b). Several other researchers have also investigated the effect of salinity and sodicity on SR (CO 2 evolution) in laboratory (Pathak & Rao, 1998;Beltrán-Hernández et al, 2007;Wong et al, 2008Wong et al, , 2009) and field studies (Chander et al, 1994;Rietz & Haynes, 2003;Yuan et al, 2007;Singh et al, 2012a).…”

Section: Co 2 Emission or C Mineralization In Saline Soilsmentioning

confidence: 99%

Microbial and Enzyme Activities of Saline and Sodic Soils

2015

View full text Add to dashboard Cite

Salinization and sodication are abiotic soil factors, important hazards to soil fertility and consequently affect the crop production. Soil salinization is of great concern for irrigated agriculture in arid and semi‐arid regions of the world; sodicity is characterized by an excessively high concentration of sodium (Na) in their cation exchange system. In recent times, attention has been turned to study the impacts of these factors (salinity and sodicity) on soil microbial activities. Microbial activities play central role in degradation and decomposition of soil organic matter, mineralization of nutrients and stabilization of soil aggregates. To understand the ecology of soil system, therefore, it is important to be conversant with the soil microbial activities, which show quick response to little change in the soil environment. Microbial activities (generally measured as C–N dynamics, soil respiration–basal respiration, or CO2 emission), microbial abundance, microbial biomass, quotients (microbial and metabolic) and microbial community structure, and soil enzymes have been considered as potential indicators to assess the severity of the land degradation and the effectiveness of land use management. Therefore, it is important to synthesize the available information regarding microbial activities in use and management of salt‐affected soils. The reclamation and management of such soils and their physico‐chemical properties have been reviewed well in the literature. In this review, an attempt has been made to compile the current knowledge about the effects of soil salinization and sodication on microbial and enzyme activities and identify research gaps for future research. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

“…Salt-affected soils are in general classified as; saline, sodic or saline-sodic, based on their respective electrical conductivity (EC e ) and sodium adsorption ratio (SAR) of the saturated paste extracts or the sodium on the exchange sites (exchangeable sodium percentage, ESP) (Richards, 1954). Saline soils are characterized by having high EC e values (>4 dS m −1 ) while saline-sodic soils have both high EC e (>4 dS m −1 ) and SAR (>13) of the saturation extract and an Pathak and Rao, 1998;Rietz and Haynes, 2003;Setia et al, 2012;Wong et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Leaching and reclamation of a biochar and compost amended saline–sodic soil with moderate SAR reclaimed water

Chaganti

Crohn

Šimůnek

2015

Agricultural Water Management

183

View full text Add to dashboard Cite

a b s t r a c tRemediating saline-sodic soils with organic amendments is increasingly seen as a cheaper and sustainable alternative to inorganic materials. The reclamation potential of biochar, biosolids and greenwaste composts applied to a saline-sodic soil was evaluated in a laboratory leaching experiment using moderate SAR reclaimed water. Treatments included biochar, biosolids co-compost, greenwaste compost (all applied at a 75 t ha −1 rate), gypsum (50% soil gypsum requirement), biochar + gypsum, biosolids + gypsum, greenwaste + gypsum and a non-amended control. All treatments were subjected to a one month incubation after which, soils were filled in columns and leached using reclaimed water until 7 PV of water had passed. Cumulative leachate losses of Na + , Ca 2+ , and Mg 2+ were evaluated in addition to soil properties after leaching. Results show that leaching with moderate SAR water was effective in reducing the soil salinity and sodicity of all soils, irrespective of amendment application. However, incorporating biochar and composts significantly enhanced this effect. Salt leaching was higher in soils treated with organic amendments. Cumulative leachate losses of cations were significantly higher from biochar and compost treated soils compared to gypsum and unamended controls. Improvements in soil aggregate stability and saturated hydraulic conductivity were prominent in compost treated soils. After leaching, soil analyses indicated that organic amendments lowered significantly more soil EC e , ESP and SAR than that of the control soils and saturated the exchange complex with Ca 2+ . Soil pH was significantly reduced and CEC was significantly increased in only compost treated soils. Although individual organic amendment applications proved to be significant enough to remediate a saline-sodic soil, combined applications of gypsum and organic amendments were more effective in improving soil properties directly related to sodium removal including sodium leaching, hydraulic conductivity, ESP, and SAR, and therefore could have a supplementary benefit of accelerating the reclamation process.

show abstract

Short-term carbon mineralization in saline–sodic soils

Cited by 14 publications

References 24 publications

Salinization of coastal freshwater wetlands; effects of constant versus fluctuating salinity on sediment biogeochemistry

Salinization of coastal freshwater wetlands; effects of constant versus fluctuating salinity on sediment biogeochemistry

Microbial and Enzyme Activities of Saline and Sodic Soils

Leaching and reclamation of a biochar and compost amended saline–sodic soil with moderate SAR reclaimed water

Contact Info

Product

Resources

About