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| Dorner,J; Sandoval,P; Dec,D. |
| A Typic Hapludult was used to evaluate the effect of soil structure and different bulk densities (reached after the destruction of macro aggregates) on functional characteristics of the pore system. The water retention curve, pore-size distribution, shrinkage curve and index were determined in disturbed and structured samples. To evaluate the effect of soil structure on the continuity of the pore system the air permeability at different matrix potentials was measured. From the relationship between the air permeability and air-filled porosity, pore continuity indexes were calculated. The destruction of the soil structure affects the function of its pores. The amount of air-filled pores increased with the reduction of the bulk density, however, the stability... |
| Tipo: Journal article |
Palavras-chave: Soil structure; Pores; Air permeability; Ultisol. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200009 |
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| Zimmer,Adriane; Araujo,Paula B.; Bond-Buckup,Georgina. |
| This study describes the morphology and arrangement of the cuticular structures of Hyalella castroi González, Bond-Buckup & Araujo, 2006 and Hyalella pleoacuta González, Bond-Buckup & Araujo, 2006, to identify specific characters that can be used in taxonomstudies of this genus. The entire cuticular surface of both species was examined by optical and scanning electron microscopy. The data obtained were compared with available information for other members of Peracarida, mainly Amphipoda and Isopoda. Five different types of cuticular structures, including 30 types of setae, four types of microtrichs, three types of pores, and some structures formed by setules and denticles were identified. The results were compared with other groups of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cuticular surface; Hyalellinae; Microtrichs; Pores; Setae. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100019 |
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