scholarly journals Relating soil organic matter composition to soil water repellency for soil biopore surfaces different in history from two Bt horizons of a Haplic Luvisol

Ecohydrology ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. e1949 ◽  
Author(s):  
C. Haas ◽  
H.H. Gerke ◽  
R.H. Ellerbrock ◽  
P.D. Hallett ◽  
R. Horn
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Water ◽  
Water Repellency ◽  
Soil Water Repellency ◽  
Organic Matter Composition ◽  
Soil Organic Matter Composition

Changes in organic compound composition in soil following heating to maximum soil water repellency under anoxic conditions

2012 ◽  
Vol 9 (4) ◽  
pp. 369 ◽  
Author(s):  
I. Atanassova ◽  
S. H. Doerr ◽  
R. Bryant
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Water ◽  
Water Repellency ◽  
Polar Compounds ◽  
Gas Chromatography Mass Spectrometry ◽  
Natural Soil ◽  
Soil Water Repellency ◽  
Chemical Changes ◽  
First Time

Environmental contextHeating of soils under wildfires can substantially reduce their ability to absorb rainfall, causing reduced vegetation recovery and increased erosion and flooding. This study examines, for the first time, the chemical changes in soil organic matter associated with heating in the oxygen-limited conditions typical under many wildfires. There was a noticeable tendency for production of non-polar compounds, which may ultimately contribute to a more persistent form of soil water repellency with important implications for managing fire affected terrain. AbstractSoil heating, as experienced during wildfires or management burns, can lead to extreme soil water repellency (WR). Previous work has focussed on the chemical composition of soil organic matter (SOM) that may be associated with WR in natural soil samples or samples heated in air. Under wildfires, however, oxygen supply is typically reduced and previous work has shown that the extreme WR induced under such conditions resists eventual destruction at temperatures ~200 °C higher than that of the same soil heated in air. This study examines, for the first time, the chemical changes in SOM associated with extreme WR following heating under oxygen limited conditions. Extracts obtained by accelerated solvent extraction (ASE), using mixtures of isopropyl alcohol/aqueous ammonia (IPA/NH3) and dichloromethane/methanol (DCM/MeOH), were analysed using gas chromatography–mass spectrometry (GC/MS). The data were compared with the SOM composition of the same soil unheated and following heating in air. In the absence of oxygen during soil heating, phthalic acid esters, substituted benzaldehydes, unsaturated amides and organophosphate esters were produced. In comparison with extracts of the same soil heated in air, there was a decreased methoxyphenol/phenol ratio, suggesting progressive demethoxylation and synthesis of new aromatic structures likely to promote extreme WR in soil.

Thermal destruction of soil water repellency and associated changes to soil organic matter as observed by FTIR spectroscopy

CATENA ◽  
2008 ◽  
Vol 74 (3) ◽  
pp. 205-211 ◽  
Author(s):  
Ivan Simkovic ◽  
Pavel Dlapa ◽  
Stefan H. Doerr ◽  
Jorge Mataix-Solera ◽  
Vlasta Sasinkova
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Ftir Spectroscopy ◽  
Soil Water ◽  
Thermal Destruction ◽  
Water Repellency ◽  
Soil Water Repellency

Soil water repellency persistence after recurrent forest fires on Mount Carmel, Israel

2013 ◽  
Vol 22 (4) ◽  
pp. 515 ◽  
Author(s):  
Naama Tessler ◽  
Lea Wittenberg ◽  
Noam Greenbaum
Keyword(s):  
Organic Matter ◽  
Soil Water ◽  
Forest Fires ◽  
Water Drop ◽  
Chemical Properties ◽  
Water Repellency ◽  
Mediterranean Ecosystem ◽  
Long Term Effects ◽  
Soil Water Repellency ◽  
Chemical Properties Of Soils

Variations in forest fires regime affect: (1) the natural patterns of community structure and vegetation; (2) the physico-chemical properties of soils and consequently (3) runoff, erosion and sediment yield. In recent decades the Mediterranean ecosystem of Mount Carmel, north-western Israel, is subjected to an increasing number of forest fires, thus, the objectives of the study were to evaluate the long-term effects of single and recurrent fires on soil water repellency (WR) and organic matter (OM) content. Water repellency was studied by applying water drop penetration time (WDPT) tests at sites burnt by single-fire, two fires, three fires and unburnt control sites. Water repellency in the burnt sites was significantly lower than in the unburnt control sites, and the soil maintained its wettability for more than 2 decades, whereas after recurrent fires, the rehabilitation was more complicated and protracted. The OM content was significantly lower after recurrent than after a single fire, causing a clear proportional decrease in WR. The rehabilitation of WR to natural values is highly dependent on restoration of organic matter and revegetation. Recurrent fires may cause a delay in recovery and reduced productivity of the soil for a long period.

Organic Matter Fractions Controlling Soil Water Repellency in Sandy Soils From the Doñana National Park (Southwestern Spain)

2014 ◽  
Vol 27 (5) ◽  
pp. 1413-1423 ◽  
Author(s):  
Nicasio T. Jiménez‐Morillo ◽  
José A. González‐Pérez ◽  
Antonio Jordán ◽  
Lorena M. Zavala ◽  
José María Rosa ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Water ◽  
National Park ◽  
Sandy Soils ◽  
Water Repellency ◽  
Soil Water Repellency ◽  
Doñana National Park ◽  
Organic Matter Fractions

scholarly journals Soil organic matter composition of forest Rendzinas in West Bulgaria

2021 ◽  
Vol 10 (4) ◽  
pp. 320-326
Author(s):  
Biser HRİSTOV ◽  
Ivaylo KİRİLOV ◽  
Pavel PAVLOV
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Matter Composition ◽  
Soil Organic Matter Composition
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