{"type": "FeatureCollection", "features": [{"id": "10.1890/14-0295.1", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-03T16:21:24Z", "type": "Journal Article", "created": "2015-03-12", "title": "Response Of N Cycling To Nutrient Inputs In Forest Soils Across A 1000-3000 M Elevation Gradient In The Ecuadorian Andes", "description": "<p>Large areas in the tropics receive elevated atmospheric nutrient inputs. Presently, little is known on how nitrogen (N) cycling in tropical montane forest soils will respond to such increased nutrient inputs. We assessed how gross rates of mineral N production (N mineralization and nitrification) and microbial N retention (NH4+ and NO3\uffe2\uff88\uff92 immobilization and dissimilatory NO3\uffe2\uff88\uff92 reduction to NH4+ [DNRA]) change with elevated N and phosphorus (P) inputs in montane forest soils at 1000\uffe2\uff80\uff90, 2000\uffe2\uff80\uff90, and 3000\uffe2\uff80\uff90m elevations in south Ecuador. At each elevation, four replicate plots (20 \uffc3\uff97 20 m each) of control, N (added at 50 kg N\uffc2\uffb7ha\uffe2\uff88\uff921\uffc2\uffb7yr\uffe2\uff88\uff921), P (added at 10 kg P\uffc2\uffb7ha\uffe2\uff88\uff921\uffc2\uffb7yr\uffe2\uff88\uff921), and combined N + P additions have been established since 2008. We measured gross N cycling rates in 2010 and 2011, using 15N pool dilution techniques with in situ incubation of intact soil cores taken from the top 5 cm of soil. In control plots, gross soil\uffe2\uff80\uff90N cycling rates decreased with increase in elevation, and microbial N retention was tightly coupled with mineral N production. At 1000 m and 2000 m, four\uffe2\uff80\uff90year N and combined N + P additions increased gross mineral N production but decreased NH4+ and NO3\uffe2\uff88\uff92 immobilization and DNRA compared to the control. At 3000 m, four\uffe2\uff80\uff90year N and combined N + P additions increased gross N mineralization rates and decreased DNRA compared to the control; although NH4+ and NO3\uffe2\uff88\uff92 immobilization in the N and N + P plots were not different from the control, these were lower than their respective mineral N production. At all elevations, decreased microbial N retention was accompanied by decreased microbial biomass C and C:N ratio. P addition did not affect any of the soil\uffe2\uff80\uff90N cycling processes. Our results signified that four years of N addition, at a rate expected to occur at these sites, uncoupled the soil\uffe2\uff80\uff90N cycling processes, as indicated by decreased microbial N retention. This fast response of soil\uffe2\uff80\uff90N cycling processes across elevations implies that greater attention should be paid to the biological implications on montane forests of such uncoupled soil\uffe2\uff80\uff90N cycling.</p>", "keywords": ["2. Zero hunger", "Altitude", "Phosphorus", "04 agricultural and veterinary sciences", "Forests", "Nitrogen Cycle", "15. Life on land", "dissimilatory nitrate reduction to ammonium; gross N mineralization; gross nitrification; microbial N immobilization;nitrogen and phosphorus additions; nutrient manipulation experiment; tropical Andes ;tropical montane forests", "Random Allocation", "Soil", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Ecuador", "Soil Microbiology"]}, "links": [{"href": "https://doi.org/10.1890/14-0295.1"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1890/14-0295.1", "name": "item", "description": "10.1890/14-0295.1", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1890/14-0295.1"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-03-01T00:00:00Z"}}, {"id": "10.1371/journal.pone.0219479", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-03T16:20:54Z", "type": "Journal Article", "created": "2019-07-23", "title": "An integrated assessment of nitrogen source, transformation and fate within an intensive dairy system to inform management change", "description": "From an environmental perspective optimised dairy systems, which follow current regulations, still have low nitrogen (N) use efficiency, high N surplus (kg N ha-1) and enable ad-hoc delivery of direct and indirect reactive N losses to water and the atmosphere. The objective of the present study was to divide an intensive dairy farm into N attenuation capacity areas based on this ad-hoc delivery. Historical and current spatial and temporal multi-level data- sets (stable isotope and dissolved gas) were combined and interpreted. Results showed that the farm had four distinct attenuation areas: high N attenuation: characterised by ammonium-N (NH4+-N) below 0.23 mg NH4+-N l-1 and nitrate (NO3--N) below 5.65 mg NO3-- N l-1 in surface, drainage and groundwater, located on imperfectly to moderately-well drained soils with high denitrification potential and low nitrous oxide (N2O) emissions (av. 0.0032 mg N2O-N l-1); moderate N attenuation: characterised by low NO3--N concentration in drainage water but high N2O production (0.0317 mg N2O-N l-1) and denitrification potential lower than group 1 (av. \u03b415N-NO3-: 16.4 , av. \u03b418O-NO3-: 9.2 ), on well to moderately drained soils; low N attenuation area 1: characterised by high NO3--N (av. 6.90 mg NO3--N l-1) in drainage water from well to moderately-well drained soils, with low denitrification potential (av. \u03b415N-NO3-: 9.5 , av. \u03b418O-NO3-: 5.9 ) and high N2O emissions (0.0319 mg N2O l-1); and low N attenuation area 2: characterised by high NH4+-N (av. 3.93 mg NH4+-N l-1 and high N2O emissions (av. 0.0521 mg N2O l-1) from well to imperfectly drained soil. N loads on site should be moved away from low attenuation areas and emissions to air and water should be assessed.", "keywords": ["dairy systems", "Farms", "Time Factors", "550", "Nitrogen", "Science", "Nitrous Oxide", "management change", "Oxygen Isotopes", "01 natural sciences", "Permeability", "nitrogen", "dissimilatory nitrate reduction to ammonium", "soil", "Dairy system", "Soil", "Isotopes", "Waste Management", "Oxygen Radioisotopes", "Ammonium Compounds", "0105 earth and related environmental sciences", "2. Zero hunger", "Nitrates", "Geography", "Stable Isotopes", "Q", "R", "Water", "Agriculture", "15. Life on land", "nitrification", "6. Clean water", "Management", "DNRA", "Dairying", "Milk", "Slurries", "13. Climate action", "Denitrification", "Medicine", "Intensive", "Research Article"]}, "links": [{"href": "https://eprints.whiterose.ac.uk/148308/8/journal.pone.0219479.pdf"}, {"href": "https://air.unimi.it/bitstream/2434/956826/2/document.pdf"}, {"href": "https://doi.org/10.1371/journal.pone.0219479"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/PLOS%20ONE", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1371/journal.pone.0219479", "name": "item", "description": "10.1371/journal.pone.0219479", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1371/journal.pone.0219479"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-07-23T00:00:00Z"}}, {"id": "10182/14566", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-03T16:26:43Z", "type": "Journal Article", "created": "2019-07-23", "title": "An integrated assessment of nitrogen source, transformation and fate within an intensive dairy system to inform management change", "description": "From an environmental perspective optimised dairy systems, which follow current regulations, still have low nitrogen (N) use efficiency, high N surplus (kg N ha-1) and enable ad-hoc delivery of direct and indirect reactive N losses to water and the atmosphere. The objective of the present study was to divide an intensive dairy farm into N attenuation capacity areas based on this ad-hoc delivery. Historical and current spatial and temporal multi-level data- sets (stable isotope and dissolved gas) were combined and interpreted. Results showed that the farm had four distinct attenuation areas: high N attenuation: characterised by ammonium-N (NH4+-N) below 0.23 mg NH4+-N l-1 and nitrate (NO3--N) below 5.65 mg NO3-- N l-1 in surface, drainage and groundwater, located on imperfectly to moderately-well drained soils with high denitrification potential and low nitrous oxide (N2O) emissions (av. 0.0032 mg N2O-N l-1); moderate N attenuation: characterised by low NO3--N concentration in drainage water but high N2O production (0.0317 mg N2O-N l-1) and denitrification potential lower than group 1 (av. \u03b415N-NO3-: 16.4 , av. \u03b418O-NO3-: 9.2 ), on well to moderately drained soils; low N attenuation area 1: characterised by high NO3--N (av. 6.90 mg NO3--N l-1) in drainage water from well to moderately-well drained soils, with low denitrification potential (av. \u03b415N-NO3-: 9.5 , av. \u03b418O-NO3-: 5.9 ) and high N2O emissions (0.0319 mg N2O l-1); and low N attenuation area 2: characterised by high NH4+-N (av. 3.93 mg NH4+-N l-1 and high N2O emissions (av. 0.0521 mg N2O l-1) from well to imperfectly drained soil. N loads on site should be moved away from low attenuation areas and emissions to air and water should be assessed.", "keywords": ["dairy systems", "Farms", "Time Factors", "550", "Nitrogen", "Science", "Nitrous Oxide", "management change", "Oxygen Isotopes", "01 natural sciences", "Permeability", "nitrogen", "dissimilatory nitrate reduction to ammonium", "soil", "Dairy system", "Soil", "Isotopes", "Waste Management", "Oxygen Radioisotopes", "Ammonium Compounds", "0105 earth and related environmental sciences", "2. Zero hunger", "Nitrates", "Geography", "Stable Isotopes", "Q", "R", "Water", "Agriculture", "15. Life on land", "nitrification", "6. Clean water", "Management", "DNRA", "Dairying", "Milk", "Slurries", "13. Climate action", "Denitrification", "Medicine", "Intensive", "Research Article"]}, "links": [{"href": "https://eprints.whiterose.ac.uk/148308/8/journal.pone.0219479.pdf"}, {"href": "https://air.unimi.it/bitstream/2434/956826/2/document.pdf"}, {"href": "https://doi.org/10182/14566"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/PLOS%20ONE", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10182/14566", "name": "item", "description": "10182/14566", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10182/14566"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-07-23T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=dissimilatory+nitrate+reduction+to+ammonium&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=dissimilatory+nitrate+reduction+to+ammonium&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=dissimilatory+nitrate+reduction+to+ammonium&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=dissimilatory+nitrate+reduction+to+ammonium&offset=3", "hreflang": "en-US"}], "numberMatched": 3, "numberReturned": 3, "distributedFeatures": [], "timeStamp": "2026-04-04T07:30:43.910804Z"}