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Documents disponibles dans cette catégorie (133)
Communication à un Congrès (avec Actes)
J. Boyazoglu | Paris [France] : CIHEAM | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 1016-121X | 1989La production mondiale de lait de brebis est évaluée à un peu moins de 9 millions de tonnes, contre environ 460 millions de tonnes de lait de bovins. Néanmoins, les trois quarts de la production mondiale sont concentrés dans la zone méditerranée[...]Communication à un Congrès (avec Actes)
I. Serrasolsas ; A. Ferran ; V.R. Vallejo | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989Litter evolution is studied in plots of increasing age after fire: from 2 months to 30 years. During the first year, the L horizon decomposed quickly. The process was described by the decreasing of the L/F ratio during this period. From second y[...]Communication à un Congrès (avec Actes)
L. Calvo ; E. Luis ; R. Tárrega | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989First phases of regeneration in three types of heath communities after fire, cutting and uprooting in experimental plots have been studied, devoting a particular attention to the herbaceous species. Greater rate of perennial than annual species [...]Communication à un Congrès (avec Actes)
J.F. Gallardo ; I. Santa Regina ; C. San Miguel | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989The biomass and litter mineral content of three forest ecosystems of the Sierra de Bojar are been determined. No significant differences have been found in the total chemical composition of the different litter constituents of the three forest e[...]Communication à un Congrès (avec Actes)
J. Cañas ; T. Franquesa | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989We have made selective cuts of bush in mixed Mediterranean forest of Pinus halepensis, Quercus ilex, and Quercus cerrioides in order to get rid of important amounts of dried up Erica arborea a cut down the risk of fire. Our main purpose was to c[...]Communication à un Congrès (avec Actes)
E. Luis ; E. Garzón ; R. Tárrega ; L. Calvo | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989Soil physical and chemical characteristics of 38 shrub communities, located in Leon province, have been studied and compared with the dominant ligneous species. All the samples have been compared using a factorial analysis of principal component[...]Communication à un Congrès (avec Actes)
J.L. Rubio | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989In Mediterranean conditions hydric soil erosion is the most dangerous threat of soil degradation. The erosion processes have widespread consequences in the ecological values of the land and also strong implications in the agricultural and forest[...]Communication à un Congrès (avec Actes)
D. Bonilla ; F. Roda | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989In March 1986, four 2x2 m treeless plots were trenched all around in an evergreen oak stand in the Montseny mountains (NE Spain). Responses to perturbation were monitorised through: 1) net mineralisation and nitrification rates measured monthly [...]Communication à un Congrès (avec Actes)
A. Puerto ; J.A. Garcia ; M.D. Matias ; A. Saldaña ; C. Pérez | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989The aim of the present work is to offer new data for discussion on the structural characters induced by the tree covering in grassland communities. Particular emphasis is given to the heterogeneity caused by the location (canopy understory, cano[...]Communication à un Congrès (avec Actes)
M.T. Aguinaco ; J. Bellot ; M. Serrano | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989Distribution on aquatic macrophytes has been studied down the drainage channel, in the irrigated area of La Violada (Huesca, Spain). In the affinity analysis we detect two groups of macrophytes: the helophytes and the limnophytes. Data on chemic[...]Communication à un Congrès (avec Actes)
F. Gonzalez Bernaldez ; C. Montes | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989Protected areas cannot be unlimited, being thus necessary to rationalise their constitution. For a long time nature conservation was based on the protection of outstanding endangered species. Later on, the interest expanded to the remaining orga[...]Communication à un Congrès (avec Actes)
J. Kummerow | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989The purpose of this contribution is to discuss the adaptive value of a few morphological characteristics of shrubs of Mediterranean-type ecosystems. Structural characters, such as the crypts in the leaf epidermis of some sclerophyllous shrub spe[...]Communication à un Congrès (avec Actes)
M. Rico | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989A study is made of aspects related to the structure of grassland communities occupying contrasted positions on slopes. Thirty slopes were chosen in the dehesa zone of the province of Salamanca (Spain); in each, the communities occupying the most[...]Communication à un Congrès (avec Actes)
D. Rosich ; A. Castelló ; V.R. Vallejo | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989The input and decomposition of litter, and the C/N ratio evolution was studied for 2 years in evergreen oak forests in the Catalonian Central Basin. The decay constant, k, obtained was 0.365. The C/N ratio had a sharp decrease in the initial 7 m[...]Communication à un Congrès (avec Actes)
J. Canadell ; F. Roda | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989Root systems from 36 holm oak (Quercus ilex L.) trees were excavated, at La Castanya, Biological Station, Montseny. Allometric equations were developed to estimate below ground biomass at an experimental plot. Because of fine root losses during [...]Communication à un Congrès (avec Actes)
P. Garcia Manteca ; Y. González ; M.A. Alvarez ; J. Marquez ; J.A. Fernández Prieto | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989A vegetation map was prepared using 32 different types of vegetation elements as part of an environmental study of Somiedo area (Asturias). This information was digitised in one hectare elements to incorporate it in a territorial database. This [...]Communication à un Congrès (avec Actes)
A. Pastor ; J. Martin | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989This paper deals with Pinus halepensis plantations in Alicante's province. The particular orographic and geographic situation of this area lead to a large climatic variability from subhumid to arid with different thermic regimes. The mean yearly[...]Communication à un Congrès (avec Actes)
M.J. Lledó ; J. Piñol | Zaragoza [Espagne] : CIHEAM-IAMZ | Options Méditerranéennes : Série A. Séminaires Méditerranéens, ISSN 0253-1542 | 1989Here is the hydrological record (rainfall and streamflow) of two impervious watersheds paired and covered by a dense Quercus ilex forest. They are located in the Serra de Prades (Tarragona, Spain) where the climate is typically Mediterranean. Th[...]Actes de Congrès ou Communication isolée
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Communication à un Congrès (avec Actes)
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Communication à un Congrès (avec Actes)
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