Nitrogen in Terrestrial Ecosystems de Carl O. Tamm

Nitrogen in Terrestrial Ecosystems

Carl O. Tamm

en Limba Engleză Paperback – 23 dec 2011

Nitrogen is a key element in ecosystem processes. Aspects of local and global changes in nitrogen in both undisturbed and disturbed conditions are discussed. Environmental changes caused by pollution from nitrogenous compounds and changes in landuse are also described. Organisms, plants, animals and microorganisms are all affecting nitrogen supply. Emphasis is placed on natural and anthropogenic transfer of nitrogen between ecosystems and also on the interaction of nitrogen with other bioelements.

Citește tot Restrânge

Cuprins

1 Introduction: Geochemical Occurrence of Nitrogen. Natural Nitrogen Cycling and Anthropogenic Nitrogen Emissions.- 2 Nitrogen in Plants and Soils: Physiological and Microbiological Background for Biological Nitrogen Turnover.- 2.1 Nitrogen in Plants.- 2.2 Nitrogen in Soils: Transformations, Uptake, Losses.- 2.3 Nitrogen and Transport Mechanisms in Terrestrial Ecosystems.- 3 Nitrogen-Limited and Nitrogen-Depleted Terrestrial Ecosystems: Ecological Characteristics.- 3.1 Definitions.- 3.2 Nitrogen in Forest Successions.- 3.3 Biological Control of Nitrogen Cycling.- 3.4 Nitrogen Depletion by Fire and Other Disturbances.- 3.5 Nitrogen Depletion by Removal of Biomass or Litter.- 3.6 Concluding Remarks.- 4 Nitrogen-Enriched and Nitrogen-Saturated Ecosystems.- 4.1 Definitions.- 4.2 Sites Naturally Enriched with Nitrogen.- 4.3 Nitrogen Enrichment by Preindustrial Agricultural and Pastural Land Use.- 4.4 Enrichment by Chemical Fertilizers and Urban Waste Products.- 4.5 Enrichment by Atmospheric Emissions from Modern Industrial and Agricultural Activities.- 5 Consequences of Increased Nitrogen Supply to Forests and Other Natural and Seminatural Terrestrial Ecosystems.- 5.1 Changes in Vegetation and Fauna.- 5.2 Soil Chemical and Biological Changes, Including Nitrogen Losses to Groundwater and Atmosphere.- 5.3 Acute Damage to Plants Associated with Emissions of Nitrogen Compounds.- 5.4 Interactions Between Effects of Anthropogenic Nitrogen Emissions and Other Human Impacts on Terrestrial Ecosystems.- 6 Conclusions.- References.