Titlebook: Nitrogen Cycling in the Americas: Natural and Anthropogenic Influences and Controls; Luiz A. Martinelli,Robert W. Howarth Book 2006 Spring

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More is less: agricultural impacts on the N cycle in Argentina,le scales, from the global impact on atmospheric chemistry to the impact of human activities on soil organic matter and fertility at the scale of square meters. Nevertheless, anthropogenic loading of nitrogen cycling in natural and managed ecosystems can be seen most directly at the regional scale,

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Urban influences on the nitrogen cycle in Puerto Rico, the Northern hemisphere, where experimental data are available. In tropical developing countries, however, experimental studies are lacking. This paper summarizes available data and assesses the impacts of human activities on N fluxes in Puerto Rico, a densely populated Caribbean island that has ex

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The influence of climate on average nitrogen export from large watersheds in the Northeastern Unitendscape, with on average 20 to 25% of these inputs exported in rivers and 75 to 80% of the nitrogen retained or denitrified in the landscape. Here, we use data for average riverine nitrogen fluxes and anthropogenic inputs of nitrogen over a 6-year period (1988–1993) for 16 major watersheds in the no

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Coastal eutrophication assessment in the United States,oastal pollution problem includes impacts including increased areas and severity of hypoxic and anoxic waters; alteration of food webs; degradation and loss of sea grass beds, kelp beds and coral reefs; loss of biodiversity; and increased incidences and duration of harmful algal blooms. In this pape

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Nutrient-chlorophyll relationships in tropical-subtropical lakes: do temperate models fit?,192 lakes from tropical and subtropical regions we examine the relationship between total P (TP) and chlorophyll (Chl). The lakes are all located between 30° S to 31° N include systems in Asia, Africa, and North and South America but are dominated by Brazilian (.=79) and subtropical N. American (.=6

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The stable carbon and nitrogen isotopic composition of vegetation in tropical forests of the Amazonlitter from four sites in the Amazon region, Brazil. Samples were collected in Manaus (3° 06′07″ S; 60°01′30″ W), Ji-Paraná (10°53′07″ S; 61°57′06″ W), and Santarém (2°26′35″ S; 54°42′30″ W) with mean annual precipitation of 2207, 2040 and 1909 mm respectively. The overall average for all leaf sampl