WilseyParentRouletEtAl2002

Référence

Wilsey, B.J., Parent, G., Roulet, N.T., Moore, T.R., Potvin, C. (2002) Tropical pasture carbon cycling: Relationships between C source/sink strength, above-ground biomass and grazing. Ecology Letters, 5(3):367-376.

Résumé

We measured net ecosystem CO2 exchange (NEE) in Panama? over C4 pasture plots that varied in grazing intensity. After adjusting for variation in light, there were noticeable effects of grazing-related variables on CO2 exchange that were largely dependent on the developmental stage of the plant canopy. Above-ground productivity was positively related to grazing intensity (r2 = 0.30). Two experimentally grazed fields had significantly lower standing crop biomass but no significant difference in CO2 uptake (24.2 ?mol/m2/s) compared with two ungrazed fields (20.3 ?mol/m2/s). Grazed fields had significantly lower ecosystem respiration rates (10.3 ?mol/m2/s) than did ungrazed fields (17.6 ?mol/m2/s). These results suggest that, although these pastures were possible sources of CO2 during the time intervals sampled, the size of the sources tended to be dampened by cattle grazing through reductions in ecosystem respiration. Thus, it appears that disturbance caused by cattle grazing will not always result in an increase in CO2 release from tropical pastures to the atmosphere.

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@ARTICLE { WilseyParentRouletEtAl2002,
    AUTHOR = { Wilsey, B.J. and Parent, G. and Roulet, N.T. and Moore, T.R. and Potvin, C. },
    TITLE = { Tropical pasture carbon cycling: Relationships between C source/sink strength, above-ground biomass and grazing },
    JOURNAL = { Ecology Letters },
    YEAR = { 2002 },
    VOLUME = { 5 },
    PAGES = { 367-376 },
    NUMBER = { 3 },
    NOTE = { 1461023X (ISSN) Cited By (since 1996): 8 Export Date: 26 April 2007 Source: Scopus CODEN: ECLEF doi: 10.1046/j.1461-0248.2002.00322.x Language of Original Document: English Correspondence Address: Wilsey, B.J.; Department of Botany; Iowa State University Ames, IA 50011, United States; email: bwilsey@iastate.edu References: Alm, J., Schulman, L., Walden, J., Nykanen, H., Martikainen, P.J., Silvola, J., Carbon balance of a boreal bog during a year with an exceptionally dry summer (1999) Ecology, 80, pp. 161-174; Bawa, K.S., Dayanandan, S., Socioeconomic factors and tropical deforestation (1997) Nature, 386, pp. 562-563; Bellisario, L.M., Moore, T.R., Bubier, J.L., Net ecosystem CO2 exchange in a boreal peatland, northern Manitoba (1998) Écoscience, 5, pp. 534-551; Bremer, D.J., Ham, J.M., Owensby, C.E., Knapp, A.K., Responses of soil respiration to clipping and grazing in a tallgrass prairie (1998) J. Environ. 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    ABSTRACT = { We measured net ecosystem CO2 exchange (NEE) in Panama? over C4 pasture plots that varied in grazing intensity. After adjusting for variation in light, there were noticeable effects of grazing-related variables on CO2 exchange that were largely dependent on the developmental stage of the plant canopy. Above-ground productivity was positively related to grazing intensity (r2 = 0.30). Two experimentally grazed fields had significantly lower standing crop biomass but no significant difference in CO2 uptake (24.2 ?mol/m2/s) compared with two ungrazed fields (20.3 ?mol/m2/s). Grazed fields had significantly lower ecosystem respiration rates (10.3 ?mol/m2/s) than did ungrazed fields (17.6 ?mol/m2/s). These results suggest that, although these pastures were possible sources of CO2 during the time intervals sampled, the size of the sources tended to be dampened by cattle grazing through reductions in ecosystem respiration. Thus, it appears that disturbance caused by cattle grazing will not always result in an increase in CO2 release from tropical pastures to the atmosphere. },
    KEYWORDS = { C cycle Grasslands Grazing Net ecosystem carbon exchange Panama? Tropical ecology carbon cycle gas exchange grazing pasture source-sink dynamics tropical environment Panama },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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