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Solute dynamics in soil water and groundwater in a central Amazon catchment undergoing deforestation

Williams MR, Fisher TR, and Melack JM ·
1997

Hydrochemical changes caused by slash-and-bum agricultural practices in a small upland catchment in the central Amazon were measured. Solute concentrations were analyzed in wet deposition, overland flow, shallow throughflow, groundwater and bank seepage in a forested plot (about 5 ha) and an adjacent plot (about 2 ha) which had been deforested in July 1989 and planted to manioc, and in stream water in partially deforested and forested catchments.

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Solute export from forested and partially deforested catchments in the central Amazon

Williams MR and Melack JM ·
1997

The hydrochemical responses to slash-and-bum agriculture in a small rainforest catchment of the central Amazon were investigated for one year. Disturbances in the partially deforested catchment began in 1987, and during the study a 2-ha plot was cut (July 1989) and burned (October 1989) in preparation for the cultivation of manioc; the partially deforested catchment was approximately 80% deforested at the time of this study.

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Effects of ultraviolet and photosynthetically active radiation on five seagrass species (Page 1)

Effects of ultraviolet and photosynthetically active radiation on five seagrass species

Dawson SP and Dennison WC ·
1996

Five seagrass species [Halophila ovalis (R.Br) Hook. f., Halodule uninervis (Forsk.) Aschers., Zostera capricorni Aschers., Cymodocea serrulata (R.Br) Aschers. (ed.) and Syringodium isoetifolium (Aschers.) Dandy] from Moreton Bay, Australia, were grown under increased (+25%) and ambient levels of ultraviolet (UV) radiation and photosynthetically active radiation (PAR), and various morphological and physiological responses were examined.

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Light intensity and the interactions between physiology, morphology and stable isotope ratios in five species of seagrass (Page 1)

Light intensity and the interactions between physiology, morphology and stable isotope ratios in five species of seagrass

Grice AM, Loneragan NR, and Dennison WC ·
1996

The effects of light intensity on stable isotope ratios, physiology and morphology of five seagrass species were investigated in an outdoor, light controlled experiment. Seagrasses were maintained in flowing seawater aquaria, with each seagrass species exposed to different light regimes (5, 15, 20, 30, 50, and 100% full sunlight) using shade screens.

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Toward a national agenda for research in the coastal zone: Where are we?

Malone TC and Nemazie DA ·
1996

In response to the complex challenges of understanding and managing the effects of human activities on coastal ecosystems, the research establishment has produced a plethora of reports and implemented a bewildering array of government-sponsored research and monitoring programs that are not cost-effective on regional or national scales.

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