The mysterious missing sink
Article Abstract:
Thirty years ago geochemists were confident that the imbalance between carbon from man's activities and measured concentrations in the atmosphere could be explained by the uptake of carbon at the ocean's surface. Detailed surface carbon-flux measurements in the 1970s and 1980s and in 1990 Tans and colleagues reported that the annual flux to oceans was probably less than 0.5 x 10(super15) g of carbon a year. Nadelhoffer and colleagues now conclude that the 'missing sink' for atmospheric CO(sub2) cannot be explained by uptake in the northern temperate forests. They show that nitrogen is not stimulating forest carbon uptake in temperate forests, after tracing (super15)N through various forest compartments.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Planktonic nutrient regeneration and cycling efficiency in temperate lakes
Article Abstract:
Planktonic nutrient regeneration maintains the majority of primary productivity in marine and freshwater. The efficiency of nutrient regeneration is thought to fall along a gradient of productivity, and nutrient-poor environments are assumed to be more efficient at nutrient cycling. Phosphorus regeneration was measured directly, and cycling efficiency was found not to vary with phosphorus concentration.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Phosphate concentrations in lakes
Article Abstract:
Research is presented concerning the phosphate concentrations in 56 lakes in North America. The use of steady-state radiobioassay techniques to survey picomolar nutrient concentrations is discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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