{"type": "FeatureCollection", "features": [{"id": "10.1007/bf00335811", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:25Z", "type": "Journal Article", "created": "2002-08-25", "title": "Prolonged Simulated Acid Rain Treatment In The Subarctic: Effect On The Soil Respiration Rate And Microbial Biomass", "description": "Humus chemistry and respiration rate, ATP, ergosterol, and muramic acid concentration as measures of chemical properties, microbial activity, biomass, and indicators of fungal and bacterial biomass were studied in a long-term acid rain experiment in the far north of Finnish Lapland. The treatments used in this study were dry control, irrigated control (spring water, pH 6), and two levels of simulated acid rain (pH 4 and pH 3). Originally (1985\u20131988), simulated acid rain was prepared by adding both H2SO4 and HNO3 (1.9:1 by weight). In 1989 the treatments were modified as follows. In subarea 1 the treatments continued unchanged (H2SO4+HNO3 in rain to pH 4 and pH 3), but in subarea 2 only H2SO4 was applied. The plots were sampled in 1992. The acid application affected humus chemistry by lowering the pH, cation exchange capacity, and base saturation (due to a decrease in Ca and Mg) in the treatment with H2SO4+HNO3 to pH 4 (total proton load over 8 years 2.92 kmol ha-1), whereas the microbial variables were not affected at this proton load, and only the respiration rate decreased by 20% in the strongest simulated acid rain treatment (total proton load 14.9 kmol ha-1). The different ratios of H2SO4+HNO3 in subareas 1 and 2 did not affect the results.", "keywords": ["havumets\u00e4t", "570", "ergosteroli", "0401 agriculture", " forestry", " and fisheries", "hapan sade", "mikrobibiomassa", "04 agricultural and veterinary sciences", "humus", "maan hengitys", "01 natural sciences", "6. Clean water", "0105 earth and related environmental sciences"], "contacts": [{"organization": "Vanhala, P., Fritze, H., Neuvonen, S.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/bf00335811"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biology%20and%20Fertility%20of%20Soils", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/bf00335811", "name": "item", "description": "10.1007/bf00335811", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/bf00335811"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1996-07-01T00:00:00Z"}}, {"id": "10.1007/bf00418673", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:26Z", "type": "Journal Article", "created": "2004-11-09", "title": "Wood-Ash Fertilization And Fire Treatments In A Scots Pine Forest Stand: Effects On The Organic Layer, Microbial Biomass, And Microbial Activity", "description": "We studied the reactions of humus layer (F/H) microbial respiratory activity, microbial biomass C, and the fungal biomass, measured as the soil ergosterol content, to the application of three levels of wood ash (1000, 2500, and 5000 kg ha-1) and to fire treatment in a Scots pine (Pinus sylvestris L.) stand. Physicochemical measurements (pH, organic matter content, extractable and total C content, NH                   4                   +                 and total N content, cation-exchange capacity, base saturation) showed similarity between the fire-treated plots and those treated with the lowest dose of wood ash (1000 kg ha-1). The ash application did not change the level of microbial biomass C or fungal ergosterol when compared to the control, being around 7500 and 350 \u03bcg g-1 organic matter for the biomass C and ergosterol, respectively. The fire treatment lowered the values of both biomass measurements to about half that of the control values. The fire treatment caused a sevenfold fall in the respiration rate of fieldmoist soil to 1.8 \u03bcl h-1 g-1 organic matter compared to the values of the control or ash treatments. However, in the same soils adjusted to a water-holding capacity of 60%, the differences between the fire treatment and the control were diminished, and the ash-fertilized plots were characterized by a higher respiration rate compared to the control plots. The glucose-induced respiration reacted in the same way as the water-adjusted soil respiration. The metabolic quotient, qCO2, gradually increased from the control level with increasing applications of ash, reaching a maximum in the fire treatment. Nitrification was not observed in the treatment plots.", "keywords": ["maaper\u00e4n respiraatio", "580", "havumets\u00e4t", "570", "Pinus sylvestris", "nitrifikaatio", "04 agricultural and veterinary sciences", "humus", "15. Life on land", "6. 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