{"type": "FeatureCollection", "features": [{"id": "10.1016/j.envpol.2008.04.009", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:15:36Z", "type": "Journal Article", "created": "2008-05-28", "title": "Influence Of Solar Uv Radiation On The Nitrogen Metabolism In Needles Of Scots Pine (Pinus Sylvestris L.)", "description": "Needles of 20-year-old Scots pine (Pinus sylvestris L.) saplings were studied in an ultraviolet (UV) exclusion field experiment (from 2000 to 2002) in northern Finland (67 degrees N). The chambers held filters that excluded both UV-B and UV-A, excluded UV-B only, transmitted all UV (control), or lacked filters (ambient). UV-B/UV-A exclusion decreased nitrate reductase (NR) activity of 1-year-old needles of Scots pines compared to the controls. The proportion of free amino acids varied in the range 1.08-1.94% of total proteins, and was significantly higher in needles of saplings grown under UV-B/UV-A exclusion compared to the controls or UV-B exclusion. NR activity correlated with air temperature, indicating a 'chamber effect'. The study showed that both UV irradiance and increasing temperature are significant modulators of nitrogen (N) metabolism in Scots pine needles.", "keywords": ["0106 biological sciences", "0301 basic medicine", "Air Pollutants", "Ecology", "Nitrogen", "Ultraviolet Rays", "typpimetabolia", "rasvahapot", "Temperature", "Pinus sylvestris", "01 natural sciences", "UV-s\u00e4teily", "subarktiset alueet", "nitraattireduktaasi", "Plant Leaves", "03 medical and health sciences", "Seedlings", "l\u00e4mp\u00f6tila", "Seasons", "Finland"]}, "links": [{"href": "https://doi.org/10.1016/j.envpol.2008.04.009"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Pollution", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.envpol.2008.04.009", "name": "item", "description": "10.1016/j.envpol.2008.04.009", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.envpol.2008.04.009"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2008-12-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2005.12.010", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:16:10Z", "type": "Journal Article", "created": "2006-02-24", "title": "Microbial Communities, Biomass, And Activities In Soils As Affected By Freeze Thaw Cycles", "description": "Abstract   Two Finnish agricultural soils (peat soil and loamy sand) were exposed to four freeze-thaw cycles (FTC), with a temperature change from \u221217.3\u00b10.4\u00a0\u00b0C to +4.1\u00b10.4\u00a0\u00b0C. Control cores from both soils were kept at constant temperature (+6.6\u00b12.0\u00a0\u00b0C) without FTCs. Soil N 2 O and CO 2  emissions were monitored during soil thawing, and the effects of FTCs on soil microbes were studied. N 2 O emissions were extremely low in peat soil, possibly due to low soil water content. Loamy sand had high N 2 O emission, with the highest emission after the second FTC. Soil freeze-thaw increased anaerobic respiration in both soil types during the first 3\u20134 FTCs, and this increase was higher in the peat soil. The microbial community structure and biomass analysed with lipid biomarkers (phospholipid fatty acids, 3- and 2- hydroxy fatty acids) were not affected by freezing-thawing cycles, nor was soil microbial biomass carbon (MIB-C). Molecular analysis of the microbial community structure with temperature gradient gel electrophoresis (TGGE) also showed no changes due the FTCs. These results show that freezing and thawing of boreal soils does not have a strong effect on microbial biomass or community structure.", "keywords": ["hiilidioksidi", "570", "biomassa", "j\u00e4\u00e4tymis-sulamissykli", "mikrobiyhteis\u00f6n rakenne", "lipidit", "maamikrobiologia", "j\u00e4\u00e4tyminen", "structure", "lipid biomarkers", "maaper\u00e4", "mikrobiyhteis\u00f6rakenne", "biomass", "TGGE", "lipidibiomarkkeri", "N2O", "sulaminen", "dityppioksidi", "04 agricultural and veterinary sciences", "15. Life on land", "freeze-thaw cycle", "6. Clean water", "13. 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