{"type": "FeatureCollection", "features": [{"id": "10.1007/s004420050242", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:14:34Z", "type": "Journal Article", "created": "2002-08-25", "title": "Nutrient Limitation And Plant Species Composition In Temperate Salt Marshes", "description": "Addition of inorganic nitrogen, phosphorus and potassium in a factorial design in two ungrazed Wadden-Sea salt marshes at low and high elevations showed that nitrogen was the limiting nutrient. No effects of nutrient addition were detected in the 1st year, probably due to a considerable rainfall deficit during the growing season. In the 2nd year, which was more humid, only nitrogen addition caused significant effects in both the low salt marsh dominated by Puccinellia maritima and the high marsh dominated by Festuca rubra. No two-way or three-way interactions with phosphorus or potassium were found. In the low marsh, nitrogen addition had a negative effect on the biomass of Puccinellia, but a positive effect on the biomass of Suaeda maritima and on the total above-ground biomass. Puccinellia was replaced by Suaeda after nitrogen addition, due to shading. In the high salt marsh, no significant effects of fertilizer application on total above-ground biomass were found, due to the weak response of the dominant species Festuca rubra, which accounted for 95% of total biomass. The biomass of Spergularia maritima increased, however, as a response to nitrogen addition.The shoot length of Festuca was positively affected by nitrogen fertilization. It is suggested that stands of Festuca reached maximal biomass at the study site without fertilization and that its growth was probably limited by self-shading.", "keywords": ["salt marsh", "0106 biological sciences", "nutrient limitation", "GROWTH", "VEGETATION", "rainfall deficit", "15. Life on land", "COMMUNITIES", "01 natural sciences", "plant-species interactions", "primary production"]}, "links": [{"href": "https://doi.org/10.1007/s004420050242"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s004420050242", "name": "item", "description": "10.1007/s004420050242", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s004420050242"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1997-01-01T00:00:00Z"}}, {"id": "10.1046/j.1365-2745.1999.00349.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:16:54Z", "type": "Journal Article", "created": "2003-03-12", "title": "Nitrogen And Phosphorus Limitation In A Coastal Barrier Salt Marsh: The Implications For Vegetation Succession", "description": "<p>1 A factorial fertilizer experiment was conducted in a 15-year-old coastal barrier salt marsh with a low soil nitrogen content, and in an older 100-year-old marsh with a higher nitrogen content. Plots were fertilized at high and low marsh elevations in both marshes. Nitrogen and phosphorus were applied at low and high concentrations both separately and in combination in each of 3 successive years.</p><p>2 Nitrogen limited above-ground plant growth in both young and old salt marshes in all years. Phosphorus limitation of plant growth was apparent in the first year in the young marsh and in the last year in both marshes. In young marshes with low soil organic matter, phosphorus limitation may occur. In addition, phosphorus limitation occurs at both successional stages when a marsh is saturated with nitrogen.</p><p>3 Plant species that are typical of nitrogen-rich habitats and late successional stages significantly increased in biomass after fertilization. Limonium vulgare, a low stature species of early and intermediate successional stages, decreased in biomass, whereas the taller Elymus pycnanthus and Artemisia maritima increased. After 3 years of fertilization, plant species composition in a young marsh was similar to the species composition in an unfertilized older marsh. Fertilization of a 100-year-old marsh, however, still resulted in a change in plant species composition, suggesting that succession was still occurring and that, overall, plants in marshes of different age are similar in their response to fertilization.</p>", "keywords": ["0106 biological sciences", "PRODUCTIVITY", "herbivory", "plant succession", "15. Life on land", "fertilization experiment", "01 natural sciences", "nitrogen", "SOILS", "NUTRIENT LIMITATION", "PLANT-SPECIES COMPOSITION", "PROLINE", "PATTERNS", "COMMUNITIES", "plant-species interactions", "ACCUMULATION"], "contacts": [{"organization": "Jan P. 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