Effects of vegetation type on the biogeochemistry of small catchments (Mont Lozere, France)

Lelong, F.; Dupraz, Christian; Durand, Patrick; Didon‐Lescot, Jean‐François

doi:10.1016/0022-1694(90)90119-i

Cited by 48 publications

(15 citation statements)

References 15 publications

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“…Zu entsprechenden Ergebnissen kamen auch LELONG et al (1990) und FÖLSTER (1985 JÖNSSON et al (1995), SVERDRUP (1990) und VELBEL (1986. Von diesen Modellen ist besonders das Simulationsmodell PROFILE von SVERDRUP u. WARFVINGE (1995) (JURGENSEN et al 1997, PENNE et al 2010, WORRELL u. HAMPSON 1997.…”

Section: Basenfreisetzung Durch Verwitterungunclassified

Waldentwicklungsszenarien für das Hessische Ried

Versuchsanstalt¹

2013

Beiträge Aus Der Nordwestdeutschen Forstlichen Versuchsanstalt

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Section: Basenfreisetzung Durch Verwitterungunclassified

Waldentwicklungsszenarien für das Hessische Ried

Versuchsanstalt¹

2013

Beiträge Aus Der Nordwestdeutschen Forstlichen Versuchsanstalt

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“…Les taux d'assimilation d'azote ont été considérés proportionnels aux apports atmosphériques, et choisis de façon à ajuster les teneurs en N0 3 et NhL des rivières. Le déficit d'écoulement atteint 600 mm en forêt contre 400 mm en pelouse (LELONG et al, 1990). Par conséquent, une décroissance linéaire de la lame d'eau écoulée annuelle a été imposée pendant la croissance des forêts ( fig.…”

Section: Séquences Used For Hindcasts and Forecastsunclassified

Modélisation des effets hydrochimiques à long terme des dépôts acides et des reboisements dans les bassins versants du Mont-Lozère (Sud de la France)

Durand¹,

Lelong²,

Neal³

2005

rseau

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L'évolution de la chimie des sols et des eaux dans trois petits bassins-versants subméditerranéens granitiques recevant d'importants apports atmosphériques de S04 et de poussières sahariennes a été simulée, de 1845 à 2125, en utilisant le modèle MAGIC. Ce modèle biogéochimique global comporte une série de relations d'équilibre entre les phases gazeuse, liquide et solide (adsorption de soufre, solubilité de l'aluminium, échanges cationiques, système C02/carbonates, dissociation des acides organiques) et une comptabilisation des flux d'éléments (entrées atmosphériques, sorties hydrologiques, immobilisation biologique, altération). Les bassins versants diffèrent par l'historique récente de leur utilisation par l'homme : la pelouse pâturée qui les recouvraient en 1845 n'a subsisté que dans un bassin : elle a été remplacée vers 1930 par une pessière dans l'un des bassins, et colonisée, après abandon, par une hêtraie dans l'autre. Les simulations montrent que le bassin couvert de pelouse a peu souffert de l'augmentation de l'acidité des pluies au cours du XXe siècle, et pourrait subir les apports actuels pendant plus de 100 ans sans dommage. Les deux bassins forestiers s'acidifient fortement depuis 1970 par les effets combinés de la pollution et des reboisements. Pour la pessière, seule une réduction d'au moins 60 % des apports soufrés permettrait d'inverser le processus. Le vieillissement naturel de la hêtraie produirait une amélioration même sans réduction des dépôts acides, en diminuant le taux d'assimilation de cations. Les deux facteurs acidifiants agissent donc en synergie, mais dans le cas de la pessière l'augmentation des apports acides due à l'effet filtrant des frondaisons est prépondérant, alors que dans la hêtraie, la forte immobilisation cationique dans la biomasse perenne jolie un plus grand rôle.Introduction. The combined acidifying effects of afforestation and acid deposition are well documented for sites in North-Western Europe and North America. In acid-sensitive mediterranean areas, acidification has been delayed by lower deposition rates and alkaline aeolian dust input to the ecosystems. Here, the evolution of stream water and soil chemistry, from 1845 to 2125, in three small submediterranean catchments of Southern France, is assessed using the MAGIC model.Sites and methods. Three granitic catchments have been monitored since 1981 in the South-Eastern Massif Central. The mean elevation is 1300 m above sea level and the soils are rankers and acid brown earth. The catchments are submitted to heavy atmospheric deposition of industrial acidic oxides (mainly sulphate : more than 20 kg.ha-1•year-1 of S-S04) and of alkaline saharan dust. The land use was similar in all the catchments up to 1930, and consisted mainly of extensive sheep grazing on semi natural grassland. Then one catchment (19.5 ha) was afforested with conifers (spruce), another catchment (54 ha) was abandoned and progressively settled by a beech coppice, while the other catchment (81 ha) remained covered with grassland. MAGIC is a lumped, p...

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“…JSCE, Associate Professor, Nagoya University, Chikusa-ku, Nagoya 464 ***M . JSCE, Professor, Nagoya University, Chikusa-ku, Nagoya 464 Lelong et al (1990), Roda et al (1990) and Sakamoto and Murota (1992) has found that forest canopy changes the characteristics of the rainfall through distribution into stemflow and throughfall, which in turn changes the quality and intensity of the resulting water that is delivered to the soil. Moreover, Hashino et al (1991Hashino et al ( , 1992 have shown that the water balance of these canopy components can be sufficiently modelled using tank models of varying complexities.…”

Section: Physical and Chemical Properties Of Stemflow And Throughfallmentioning

confidence: 99%

“…To account for evaporation, it is assumed that during periods of no rainfall, constant evaporation takes place which empties both tanks in a period of one day which is given by equation (4). The initial and boundary conditions are given in equation (5). Also, qo is the outflow from tank A when the water is up to the brim.…”

Section: Checking Observations Using Tank Modelmentioning

confidence: 99%

“…If the effects of vegetation on the intensity, quality and time of delivery of the water that infiltrates into the soil is negligible, then we can generally neglect its presence. However, since it has been reported that vegetation interacts with rainfall quality (Roda et al 1990, Lelong et al 1990) and more considerably on intensity (Brown andBarker 1970, Johnson 1990, Hashino et al 1991,1992, Sakamoto and Murota 1992, its effects obviously cannot be neglected especially in event flow quantity and quality modeling. However, until the present, there has been no definitive study on the physical and chemical effects of basin vegetation on the resulting water that infiltrates into the soil.…”

Section: Introductionmentioning

confidence: 99%

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On The Physical and Chemical Properties of Throughfall and Stemflow

Matsubayashi

Takagi

Velasquez

et al. 1994

PROCEEDINGS OF HYDRAULIC ENGINEERING

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The effect of vegetation on the physical and chemical characteristics of rainwater that is delivered to the soil is investigated through observations of 13 rainfall events for a watershed with deciduous and coniferous vegetation. Lumped characteristics of the resulting throughfall (ThF) and stemflow (SF) are analyzed in comparison to rainfall characteristics. Certain factors, such as the kinds and size of trees for stemflow and the distance from the stem for throughfall, were also investigated to determine their relationship to the quantity and quality of SF and ThF. To check the observed data, a tank model is used to model SF and ThF rate and concentration. Results shows that 71% of the rainfall becomes ThF and that the SF rate is 22 times that of the rainfall rate. It was also found that SF is highly dependent on the tree both for the rate and the quality. Due to the characteristics of the basin, ThF is found to be independent of tree characteristics. Finally the tank model is found to be sufficiently capable of modeling SF and ThF rate and quality.

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Effects of vegetation type on the biogeochemistry of small catchments (Mont Lozere, France)

Cited by 48 publications

References 15 publications

Waldentwicklungsszenarien für das Hessische Ried

Waldentwicklungsszenarien für das Hessische Ried

Modélisation des effets hydrochimiques à long terme des dépôts acides et des reboisements dans les bassins versants du Mont-Lozère (Sud de la France)

On The Physical and Chemical Properties of Throughfall and Stemflow

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