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Soil biology --- Research --- Biology --- Natural history

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Natural pastures --- Natural pastures --- Soil biology --- Soil biology --- Soil fungi --- Soil fungi --- nitrogen cycle --- nitrogen cycle --- biomass --- biomass --- soil chemicophysical properties --- soil chemicophysical properties --- Soil microorganisms --- Soil microorganisms --- Grassland management --- Grassland management

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Soil sciences --- Genetic soil types --- soil chemistry --- Soil biology --- Soil water --- soil air --- soil chemicophysical properties --- Soil pollution --- Soilless culture --- agriculture. --- agriculture --- Soils --- Soil science. --- Environmental aspects.

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Environmental impact --- Environmental impact --- farming systems --- farming systems --- farmland --- farmland --- land use --- land use --- plant soil relations --- plant soil relations --- Soil biology --- Soil biology --- soil fertility --- soil fertility --- Soil resources --- Soil resources --- Sustainability --- Sustainability --- Agriculture biologique --- Écologie des sols --- Agriculture biologique --- Écologie des sols

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Most of the Earth’s biosphere is characterized by low temperatures. Vast areas (>20%) of the soil ecosystem are permanently frozen or are unfrozen for only a few weeks in summer. Permafrost regions occur at high latitudes and also at high ele- tions; a significant part of the global permafrost area is represented by mountains. Permafrost soils are of global interest, since a significant increase in temperature is predicted for polar regions. Global warming will have a great impact on these soils, especially in northern regions, since they contain large amounts of organic carbon and act as carbon sinks, and a temperature increase will result in a release of carbon into the atmosphere. Additionally, the intensified release of the clima- relevant tracer gas methane represents a potential environmental harzard. Significant numbers of viable microorganisms, including bacteria, archaea, p- totrophic cyanobacteria and green algae, fungi and protozoa, are present in per- frost, and the characteristics of these microorganisms reflect the unique and extreme conditions of the permafrost environment. Remarkably, these microorg- isms have been reported to be metabolically active at subzero temperatures, even down to ?20°C.

Biodiversity. --- Climatic changes. --- Exobiology. --- Microbial ecology. --- Microbial genetics. --- Permafrost. --- Soil biology. --- Soil conservation. --- Soil microbiology. --- Earth & Environmental Sciences --- Biology --- Health & Biological Sciences --- Ecology --- Microbiology & Immunology --- Eternally frozen ground --- Ever frozen ground --- Perennially frozen ground --- Pergelisol --- Permanently frozen ground --- Perpetually frozen ground --- Tjale --- Earth sciences. --- Sedimentology. --- Microbial genomics. --- Astrobiology. --- Climate change. --- Earth Sciences. --- Climate Change. --- Microbial Ecology. --- Microbial Genetics and Genomics. --- Frozen ground --- Natural history --- Astrobiology --- Habitable planets --- Life --- Genomics --- Microbial genetics --- Microorganisms --- Genetics --- Microbiology --- Environmental microbiology --- Changes, Climatic --- Changes in climate --- Climate change --- Climate change science --- Climate changes --- Climate variations --- Climatic change --- Climatic changes --- Climatic fluctuations --- Climatic variations --- Global climate changes --- Global climatic changes --- Climatology --- Climate change mitigation --- Teleconnections (Climatology) --- Biological diversification --- Biological diversity --- Biotic diversity --- Diversification, Biological --- Diversity, Biological --- Biocomplexity --- Ecological heterogeneity --- Numbers of species --- Petrology --- Origin --- Environmental aspects --- Global environmental change