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| Abadaboudjema, Ym; Dauvin, Jean-claude. |
| A long-term survey of two mussel populations from two natural mussel beds, Bordj El Kiffan and Boudouaou, was carried out from the end of 1984 to the beginning of 1991. Samples had been also collected from 1978-1979 then from 1992-1993, but only from the first of these. Maximal densities were higher than 10,000 ind. m(-2), due to the spring and summer heavy spatfall. At Bordj El Kiffan, densities of M. galloprovincialis were 50 times more important than those of P. perna. At Boudouaou, the abundance of P. perna was 1.7 times higher than that of M. galloprovincialis. From 1986 to 1988, the mean annual biomass in dry weight of tissue including ash was higher for P. perna at Boudouaou (0.886 kg. m(-2)) than at Bordj El Kiffan (0.486 kg. m(-2)). For M.... |
| Tipo: Text |
Palavras-chave: Mytilus galloprovincialis; Perna perna; Long term; Production; Algerian coast. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20393/18060.pdf |
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| Silva,Franciani Rodrigues da; Albuquerque,Jackson Adriano; Costa,André da; Fontoura,Sandra Mara Vieira; and,Cimélio Bayer; Warmling,Maria Izabel. |
| ABSTRACT Changes in soil physical properties due to different management systems occur slowly, and long-term studies are needed to assess soil quality. The objectives of this study were to evaluate the effects of soil management systems and liming methods on the physical properties of a Latossolo Bruno Alumínico típico (Hapludox). A long-term experiment that began in 1978 with conventional and no-tillage systems was assessed. In addition, different liming methods (no lime, incorporated lime, and lime on the soil surface) have been applied since 1987 and were also evaluated in this study. Moreover, an area of native forest was evaluated and considered a reference for the natural condition of the soil. Soil physical properties were evaluated in layers to a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: No-tillage; Conventional tillage; Soil structure; Long term. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100501 |
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