Phospholipid fatty acid profiles and xylanase activity in particle size fractions of forest soil and casts of Lumbricus terrestris L. (Oligochaeta, Lumbricidae)

2007 ◽  
Vol 35 (2) ◽  
pp. 412-422 ◽  
Author(s):  
Sven Marhan ◽  
Ellen Kandeler ◽  
Stefan Scheu
Keyword(s):  
Particle Size ◽  
Fatty Acid ◽  
Forest Soil ◽  
Phospholipid Fatty Acid ◽  
Xylanase Activity ◽  
Lumbricus Terrestris ◽  
Fatty Acid Profiles ◽  
Size Fractions ◽  
Particle Size Fractions

Turnover of soil organic matter and storage of corn residue carbon estimated from natural 13C abundance

1995 ◽  
Vol 75 (2) ◽  
pp. 161-167 ◽  
Author(s):  
E. G. Gregorich ◽  
C. M. Monreal ◽  
B. H. Ellert
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Forest Soil ◽  
Half Life ◽  
Light Fraction ◽  
Organic C ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Corn Residue

Total organic C and natural C abundance were measured in a forest soil and a soil under corn (Zea mays L.) to assess management-induced changes in the quantity and initial source of organic matter. The total mass of organic C in the cultivated soil was 19% lower than in the forest soil. It was estimated that after 25 yr of continuous corn, 100 Mg C ha−1 was returned to the soil as residues, of which only 23 Mg ha−1 remained in the soil; 88% of the remaining corn-derived C (C4-derived C) was in the plow layer. About 30% of the soil organic C in the plow layer (0–27 cm) was derived from corn. Assuming first order kinetics, the half-life of C3-derived C in the 0- to 15-cm layer was 13 yr. The half-life of C3-derived C in the 0- to 30-cm layer, which included organic C below the plow layer, was 24 yr. Mineralization of the light fraction (LF) was faster than that of organic matter associated with particle-size fractions. More than 70% of the LF had turned over since the start of corn cropping, and 45% of organic matter in the sand fraction comprised corn residue. The half-life of C3-derived C in the LF was 8 yr. The mineralization of C from native organic matter associated with the coarse silt fraction was the slowest of all particle-size fractions. Key words: Soil organic matter, carbon storage, natural 13C abundance, light fraction, particle-size fractions, mineralization

Variation in lipid relative abundance and composition among different particle size fractions of a forest soil

2004 ◽  
Vol 35 (11-12) ◽  
pp. 1355-1370 ◽  
Author(s):  
K QUENEA ◽  
S DERENNE ◽  
C LARGEAU ◽  
C RUMPEL ◽  
A MARIOTTI
Keyword(s):  
Particle Size ◽  
Forest Soil ◽  
Relative Abundance ◽  
Size Fractions ◽  
Particle Size Fractions

scholarly journals Effect of particle size on the froth floatation of Sokoto phosphate ore

10.30544/215 ◽  
2016 ◽  
Vol 22 (2) ◽  
pp. 73-80
Author(s):  
U.A. Hassan ◽  
S.A. Yaro ◽  
M. M. Abdulwahab ◽  
M.R. Dodo
Keyword(s):  
Particle Size ◽  
Fatty Acid ◽  
Pulp Density ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Phosphate Ore ◽  
Sieve Size ◽  
Flotation Cell ◽  
Effect Of Particle Size ◽  
Froth Floatation

Effect of particle size on the froth floatation of Sokoto phosphate ore for its beneficiation has been investigated and established. The research has been conducted using various reagents, pH(s) at different sieve size fractions. Bench scale flotation tests were carried out on -250+180μm, -180+106μm, -106+75μm, -75+45μm and -45+38μm particle size fractions after screening in order to determine the optimum flotation feed size distribution using 1 liter Denver flotation cell. The results of the scoping flotation studies using a conditioning Pulp Density of 60%Solids, pH9, 800g/t reagent dosage for AERO704 Promoter (Fatty Acid) and flotation pulp density of 28.5% Solids show that +106μm particle size gave the highest assay content of 20.4% P2O5 with a recovery of 76.2% compared to +38μm (19.9%P2O5 and recovery of 43.2%) and +180μm (19.4%P2O5 and 24.1% recovery) in their floats (concentrates) but with no perfect separation as the tailings fraction also contained similar grades with slight differences.

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