Effects of vegetation regime on denitrification potential in two tropical volcanic soils

1993 ◽  
Vol 16 (3) ◽  
pp. 157-162 ◽  
Author(s):  
Robert P. Griffiths ◽  
Bruce A. Caldwell ◽  
Phillip Sollins
Keyword(s):  
Volcanic Soils ◽  
Denitrification Potential ◽  
Tropical Volcanic Soils

Permeability of Marine Sediments and Tropical Volcanic Soils

2012 ◽  
Author(s):  
Horst G. Brandes
Keyword(s):  
Grain Size ◽  
Marine Sediments ◽  
Deep Sea ◽  
Carbonate Content ◽  
Clayey Soils ◽  
Index Properties ◽  
Volcanic Soils ◽  
Fine Grained ◽  
Deep Sea Sediments ◽  
Tropical Volcanic Soils

Permeability values for a range of fine-grained deep-sea sediments are presented and evaluated in terms of index properties such as plasticity, grain size and carbonate content. It is found that whereas clay-rich sediments have similar permeabilities to those of equivalent land-based fine-grained soils, the presence of volcanic, carbonate and other non-clay fractions tends to increase permeability somewhat. Volcanic silty-clayey soils from Hawaii have comparable permeability values, although they can be slightly more permeable.

OXIDATIVE DEGRADATION OF HUMIC AND FULVIC ACIDS EXTRACTED FROM TROPICAL VOLCANIC SOILS

1975 ◽  
Vol 55 (3) ◽  
pp. 251-267 ◽  
Author(s):  
S. M. GRIFFITH ◽  
M. SCHNITZER
Keyword(s):  
Chemical Structure ◽  
Fulvic Acids ◽  
Oxidation Products ◽  
Gas Chromatography Mass Spectrometry ◽  
Volcanic Soils ◽  
Humic And Fulvic Acids ◽  
Oh Groups ◽  
Chemical Structures ◽  
Tropical Volcanic Soils ◽  
Major Oxidation

To obtain a better understanding of the unusual accumulation of organic matter in tropical volcanic soils in the West Indies, humic and fulvic acids were extracted with 0.5 N NaOH under N2 from four surface and two subsurface horizons of four such soils from the island of Dominica and degraded by KMnO4 oxidation of unmethylated and methylated materials. The oxidation products were fractionated by solvent extraction and chromatographic methods and 52 compounds were identified on a gas chromatography–mass spectrometry–computer system. Major oxidation products (identified as esters and ethers) were benzenecarboxylic, phenolic and aliphatic mono- and dicarboxylic acids. Smaller amounts of n-alkanes, furan derivatives and dialkyl phthalates were also identified. The major chemical structures detected in the tropical volcanic humic and fulvic acids were aromatic rings substituted by: (a) three to six C atoms; (b) one OCH3 group and three, four and six C atoms; and (c) two OH groups and one, two, three and five C atoms. Judging from the qualitative and quantitative distribution of the major oxidation products, the chemical structure of tropical volcanic humic and fulvic acids did not appear to differ significantly from that of humic and fulvic acids extracted from soils from widely differing climatic zones. We were unable to detect any effect of depth of sampling or soil pH on the chemical structure of the humic materials extracted from the tropical volcanic soils.

The distribution of nitrogen in some highly organic tropical volcanic soils

1976 ◽  
Vol 8 (1) ◽  
pp. 55-60 ◽  
Author(s):  
F.J. Sowden ◽  
S.M. Griffith ◽  
M. Schnitzer
Keyword(s):  
Volcanic Soils ◽  
Tropical Volcanic Soils

scholarly journals Long-term pollution by chlordecone of tropical volcanic soils in the French West Indies: A simple leaching model accounts for current residue

2009 ◽  
Vol 157 (5) ◽  
pp. 1697-1705 ◽  
Author(s):  
Y.-M. Cabidoche ◽  
R. Achard ◽  
P. Cattan ◽  
C. Clermont-Dauphin ◽  
F. Massat ◽  
...  
Keyword(s):  
West Indies ◽  
Volcanic Soils ◽  
French West Indies ◽  
Tropical Volcanic Soils

Engineering geology of the tropical volcanic soils of La Laguna, Tenerife

1981 ◽  
Vol 17 (1-2) ◽  
pp. 1-17 ◽  
Author(s):  
L.I. Gonzalez De Vallejo ◽  
J.A. Jimenez Salas ◽  
S. Legy Jimenez
Keyword(s):  
Engineering Geology ◽  
Volcanic Soils ◽  
Tropical Volcanic Soils

Factors controlling sizes and stabilities of subsoil organic carbon pools in tropical volcanic soils

2021 ◽  
Vol 769 ◽  
pp. 144842
Author(s):  
Han Lyu ◽  
Tetsuhiro Watanabe ◽  
Ruohan Zhong ◽  
Method Kilasara ◽  
Arief Hartono ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Pools ◽  
Volcanic Soils ◽  
Tropical Volcanic Soils
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