scholarly journals Effects of calcium treatment on forest floor organic matter composition along an elevation gradient

2014 ◽  
Vol 44 (8) ◽  
pp. 969-976 ◽  
Author(s):  
Ankit Balaria ◽  
Chris E. Johnson ◽  
Peter M. Groffman
Keyword(s):  
Organic Matter ◽  
Chemical Change ◽  
Elevation Gradient ◽  
High Elevation ◽  
Hot Water ◽  
Long Term Effects ◽  
Organic Carbon Concentration ◽  
Significant Difference ◽  
Extractable Organic Matter ◽  
Water Extractable

Calcium amendment is a restorative option for nutrient-depleted, acidic soils in the forests of the northeastern United States. We studied the effects of watershed-scale wollastonite (CaSiO3) application on the structural composition of soil organic matter (SOM) and hot-water-extractable organic matter (HWEOM) at the Hubbard Brook Experiment Forest in New Hampshire 7–9 years after treatment, along an elevation gradient. Soils in the high-elevation spruce–fir–birch (SFB) zone contained significantly greater amounts of HWEOM compared with lower elevation hardwood soils, likely due to differences in litter quality and slower decomposition rates in colder soils at higher elevation. The only significant difference in hot-water-extractable organic carbon concentration between reference and calcium-treated watersheds was in Oie horizons of the SFB zone, which also exhibited the greatest degree of soil chemical change after treatment. The 13C nuclear magnetic resonance (NMR) spectra showed no significant patterns in O-alkyl C abundance for either soil or HWEOM along the elevation gradient, suggesting that there were no elevation-related patterns in carbohydrate concentration. The general absence of long-term effects in this study suggests that effects of Ca amendment at this dosage on the composition of SOM were small or short-lived.

Ultrahigh-resolution FT-ICR mass spectrometry for molecular characterisation of pressurised hot water-extractable organic matter in soils

2016 ◽  
Vol 128 (3) ◽  
pp. 307-326 ◽  
Author(s):  
Julien Guigue ◽  
Mourad Harir ◽  
Olivier Mathieu ◽  
Marianna Lucio ◽  
Lionel Ranjard ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Hot Water ◽  
Molecular Characterisation ◽  
Ultrahigh Resolution ◽  
Extractable Organic Matter ◽  
Water Extractable ◽  
Ft Icr

Relations entre stabilité de l'agrégation et matière organique totale et soluble à l'eau chaude dans des sols ferrallitiques argileux (Congo, Brésil)

1999 ◽  
Vol 79 (4) ◽  
pp. 561-569 ◽  
Author(s):  
E. Kouakoua ◽  
M.-C. Larré-Larrouy ◽  
B. Barthès ◽  
P. L. de Freitas ◽  
C. Neves ◽  
...  
Keyword(s):  
Organic Matter ◽  
Cultural Practices ◽  
Water Extract ◽  
Aggregate Stability ◽  
Carbohydrate Content ◽  
Hot Water ◽  
Water Extraction ◽  
Hot Water Extraction ◽  
Significant Difference ◽  
Water Extractable

Organic matter (OM) generally plays an important role in soil aggregate stability. The objective of this work was to characterize the hot water-extractable OM and its role in the aggregate stability of clayey ferrallitic soils under different land use management. The macroaggregate (>200 µm) stability of these soils was determined before (AS) and after hot-water extraction (ASe). The contents in total organic carbon and in carbon present as carbohydrates, as well as the sugar composition, were determined on the bulk soils and their hot-water extracts.The carbon and macroaggregate contents decreased upon land-clearing and cultivation, but to a lesser extent when some cultural practices were used. Whatever the situation considered, the hot-water extract always presented a higher carbohydrate content than the bulk soil. The high values of ratios r = (galactose + mannose)/(arabinose + xylose) suggested that a large proportion of carbohydrates was of microbial origin. There were significant correlations between AS and the carbon content of bulk soils or hot-water extracts, and between AS and the soil carbohydrate content. On the opposite, whatever the soil sample studied, no significant difference could be found between AS and ASe, showing that hot-water extractable OM had thus no clear aggregating role in these soils. Key words: Organic matter, macroaggregate stability, hot-water extraction, carbohydrates, ferrallitic soils

Chemodiversity of water-extractable organic matter in sediment columns of a polluted urban river in South China

2021 ◽  
Vol 777 ◽  
pp. 146127
Author(s):  
Peng Zhang ◽  
Chun Cao ◽  
Ying-Hui Wang ◽  
Kai Yu ◽  
Chongxuan Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
South China ◽  
Urban River ◽  
Extractable Organic Matter ◽  
Water Extractable
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