Feller Christian, Beare M.H. (1997). Physical control of soil organic matter dynamics in the tropics. Geoderma, 79, p. 69-116. ISSN 0016-7061.
Titre du document
Physical control of soil organic matter dynamics in the tropics
Année de publication
1997
Type de document
Article
Auteurs
Feller Christian, Beare M.H.
Source
Geoderma, 1997,
79, p. 69-116 ISSN 0016-7061
Management of soil organic matter (SOM) is esential to sustaining the quality and productivity of soils around the globe. This appears to be particularly true in the tropics where there is a greater proportion of nutrient poor, highly weathered soils that are more susceptible to losses of SOM. Developing management practices that promote the maintenance and storage of SOM in the tropics depends on understanding the factors that control SOM dynamics. This paper describes the role that soil physical properties (mineralogy, texture and structure) play in regulating the accumulation and loss of SOM in tropical soils. Two different approaches are presented here. The first approach explores relationships between total SOM and soil physical properties in the tropics. These include effects of climate and mineralogy on latitudinal gradients in SOM, interactions between texture and mineralogy as determinants of SOM storage and relationships between SOM and the structural stability of soils. The second approach describes characteristics of SOM associated with different physical constituents of the soil, with particular attention to particle-size fractions and aggregated particles of different sizes. In each case we summarize findings on the distribution of SOM among fractions and characterise its biochemical composition, bioavailability and turnover. Evidence for and against the physical protection of organic matter from microbial attack in tropical soils is also given. Wherever possible, we compare and contrast the findings for tropical soils with those of temperate soils. The influence of landuse management on physical control of SOM dynamics is discussed as an overriding factor with each approach. (Résumé d'auteur)
Plan de classement
Constituants et propriétés des sols [068PROSOL]
Descripteurs
SOL ; MATIERE ORGANIQUE ; MINERALOGIE ; TEXTURE DU SOL ; STRUCTURE DU SOL ; FERTILITE DU SOL ; EVOLUTION DES SOLS SOUS CULTURE
