{"type": "FeatureCollection", "features": [{"id": "10.1007/s10021-005-0085-7", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-27T16:14:52Z", "type": "Journal Article", "created": "2006-03-20", "title": "Microbial Cycling Of C And N In Northern Hardwood Forests Receiving Chronic Atmospheric No3- Deposition", "description": "Sugar maple (Acer saccharum Marsh.)-dominated northern hardwood forests in the upper Lakes States region appear to be particularly sensitive to chronic atmospheric NO                   3                   \u2212                  deposition. Experimental NO                   3                   \u2212                  deposition (3 g NO                   3                   \u2212                  N m\u22122 y\u22121) has significantly reduced soil respiration and increased the export of DOC/DON and NO                   3                   \u2212                  across the region. Here, we evaluate the possibility that diminished microbial activity in mineral soil was responsible for these ecosystem-level responses to NO                   3                   \u2212                  deposition. To test this alternative, we measured microbial biomass, respiration, and N transformations in the mineral soil of four northern hardwood stands that have received 9 years of experimental NO                   3                   \u2212                  deposition. Microbial biomass, microbial respiration, and daily rates of gross and net N transformations were not changed by NO                   3                   \u2212                  deposition. We also observed no effect of NO                   3                   \u2212                  deposition on annual rates of net N mineralization. However, NO                   3                   \u2212                  deposition significantly increased (27%) annual net nitrification, a response that resulted from rapid microbial NO                   3                   \u2212                  assimilation, the subsequent turnover of NH                   4                   +                 , and increased substrate availability for this process. Nonetheless, greater rates of net nitrification were insufficient to produce the 10-fold observed increase in NO                   3                   \u2212                  export, suggesting that much of the exported NO                   3                   \u2212                  resulted directly from the NO                   3                   \u2212                  deposition treatment. Results suggest that declines in soil respiration and increases in DOC/DON export cannot be attributed to NO                   3                   \u2212                 -induced physiological changes in mineral soil microbial activity. Given the lack of response we have observed in mineral soil, our results point to the potential importance of microbial communities in forest floor, including both saprotrophs and mycorrhizae, in mediating ecosystem-level responses to chronic NO                   3                   \u2212                  deposition in Lake States northern hardwood forests.", "keywords": ["0106 biological sciences", "Ecology", "Science", "Plant Sciences", "Soil C and N Cycling", "Ecology and Evolutionary Biology", "Life Sciences", "Natural Resources and Environment", "Nature Conservation", "Northern Hardwood Forests", "04 agricultural and veterinary sciences", "15. Life on land", "Microbial Respiration", "Nitrification", "01 natural sciences", "Environmental Management", "N Mineralization", "Geoecology/Natural Processes", "13. Climate action", "Atmospheric NO 3 \u2212 Deposition", "0401 agriculture", " forestry", " and fisheries", "Zoology"]}, "links": [{"href": "https://doi.org/10.1007/s10021-005-0085-7"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecosystems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10021-005-0085-7", "name": "item", "description": "10.1007/s10021-005-0085-7", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10021-005-0085-7"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2006-03-01T00:00:00Z"}}, {"id": "10.1038/ngeo844", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-27T16:18:19Z", "type": "Journal Article", "created": "2010-04-25", "title": "Reduction of forest soil respiration in response to nitrogen deposition", "description": "The use of fossil fuels and fertilizers has increased the amount of biologically reactive nitrogen in the atmosphere over the past century. As a consequence, forests in industrialized regions have experienced greater rates of nitrogen deposition in recent decades. This unintended fertilization has stimulated forest growth, but has also affected soil microbial activity, and thus the recycling of soil carbon and nutrients. A meta-analysis suggests that nitrogen deposition impedes organic matter decomposition, and thus stimulates carbon sequestration, in temperate forest soils where nitrogen is not limiting microbial growth. The concomitant reduction in soil carbon emissions is substantial, and equivalent in magnitude to the amount of carbon taken up by trees owing to nitrogen fertilization. As atmospheric nitrogen levels continue to rise, increased nitrogen deposition could spread to older, more weathered soils, as found in the tropics; however, soil carbon cycling in tropical forests cannot yet be assessed", "keywords": ["[SDE] Environmental Sciences", "2. Zero hunger", "570", "EUROPEAN FORESTS", "NORTHERN HARDWOOD FORESTS", "ORGANIC-MATTER DECOMPOSITION", "MICROBIAL BIOMASS", "04 agricultural and veterinary sciences", "15. Life on land", "LITTER DECOMPOSITION", "BOREAL FOREST", "TEMPERATE FOREST", "Soils Nitrogen content", "CARBON SEQUESTRATION", "13. Climate action", "[SDE]Environmental Sciences", "SDG 13 - Climate Action", "0401 agriculture", " forestry", " and fisheries", "Soil aeration Environmental aspects", "HUMIC SUBSTANCES", "Forest ecology", "ATMOSPHERIC NITRATE DEPOSITION"]}, "links": [{"href": "https://doi.org/10.1038/ngeo844"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nature%20Geoscience", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/ngeo844", "name": "item", "description": "10.1038/ngeo844", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/ngeo844"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-04-25T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NORTHERN+HARDWOOD+FORESTS&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=NORTHERN+HARDWOOD+FORESTS&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=NORTHERN+HARDWOOD+FORESTS&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=NORTHERN+HARDWOOD+FORESTS&offset=2", "hreflang": "en-US"}], "numberMatched": 2, "numberReturned": 2, "distributedFeatures": [], "timeStamp": "2026-07-28T14:12:49.011137Z"}