Chris D. Field

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There is a consensus of scientific opinion that the activities of man will cause a significant change in the global climate over the next hundred years. The rising level of carbon dioxide and other industrial gases in the atmosphere may lead to global warming with an accompanying rise in sea-level. Mangrove ecosystems grow in the intertidal zones in(More)
The cytoplasmic electrical potential and membrane resistance of mature cells ofValonia ventricosa have been measured by inserting a microelectrode concentric with another electrode into the vacuole of the cell. The cytoplasmic region was investigated by advancing the microelectrode into the cell wall from the vacuolar side. The results revealed a unique(More)
The concept of mangrove ecosystem rehabilitation is considered. Four main reasons for rehabilitating mangroves are identified: conservation, landscaping, sustainable production and coastal protection. Practical aspects of mangrove rehabilitation, such as the causes of site degradation, site selection, source of seedlings and planting, monitoring and(More)
Wet deposition of nitrogen (N) occurs in oxidized (nitrate) and reduced (ammonium) forms. Whether one form drives vegetation change more than the other is widely debated, as field evidence has been lacking. We are manipulating N form in wet deposition to an ombrotrophic bog, Whim (Scottish Borders), and here report nine years of results. Ammonium and(More)
A radioactive isotope dilution technique, in which two radioactive tracers were used simultaneously, was employed to investigate the nature of the hepatic arterial vascular bed or arterial vascular "space" in 22 isolated perfused canine livers. The technique continuously monitored the blood leaving the liver for radioactivity so that no assumptions had to(More)
Experimental studies have shown that deposition of reactive nitrogen is an important driver of plant community change, however, most of these experiments are of short duration with unrealistic treatments, and conducted in regions with elevated ambient deposition. Studies of spatial gradients of pollution can complement experimental data and indicate whether(More)
The large increases in reactive nitrogen (N) deposition in developed countries since the Industrial Revolution have had a marked impact on ecosystem functioning, including declining species richness, shifts in species composition, and increased N leaching. A potential mitigation of these harmful effects is the action of N as a fertiliser, which, through(More)