Combined effects of co\uffe2\uff80\uff90occurring global climate changes on ecosystem responses are generally poorly understood. Here, we present results from a 2\uffe2\uff80\uff90year field experiment in aCarexfen ecosystem on the southernmost tip of South America, where we examined the effects of solar ultraviolet B (UVB, 280\uffe2\uff80\uff93315\uffe2\uff80\uff83nm) and warming on above\uffe2\uff80\uff90 and belowground plant production, C\uffe2\uff80\uff83:\uffe2\uff80\uff83N ratios, decomposition rates and earthworm population sizes. Solar UVB radiation was manipulated using transparent plastic filter films to create a near\uffe2\uff80\uff90ambient (90% of ambient UVB) or a reduced solar UVB treatment (15% of ambient UVB). The warming treatment was imposed passively by wrapping the same filter material around the plots resulting in a mean air and soil temperature increase of about 1.2\uffe2\uff80\uff83\uffc2\uffb0C. Aboveground plant production was not affected by warming, and marginally reduced at near\uffe2\uff80\uff90ambient UVB only in the second season. Aboveground plant biomass also tended to have a lower C\uffe2\uff80\uff83:\uffe2\uff80\uff83N ratio under near\uffe2\uff80\uff90ambient UVB and was differently affected at the two temperatures (marginal UVB \uffc3\uff97 temperature interaction). Leaf decomposition of one dominant sedge species (Carex curta) tended to be faster at near\uffe2\uff80\uff90ambient UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua) was significantly faster at near\uffe2\uff80\uff90ambient UVB; root decomposition of this species tended to be lower at increased temperature and interacted with UVB. We found, for the first time in a field experiment that epigeic earthworm density and biomass was 36% decreased by warming but remained unaffected by UVB radiation. Our results show that present\uffe2\uff80\uff90day solar UVB radiation and modest warming can adversely affect ecosystem functioning and engineers of this fen. However, results on plant biomass production also showed that treatment manipulations of co\uffe2\uff80\uff90occurring global change factors can be overridden by the local climatic situation in a given study year.
", "keywords": ["DECOMPOSITION", "EARTHWORMS", "0106 biological sciences", "CAREX CURTA", "ECOSYSTEM FUNCTIONING", "04 agricultural and veterinary sciences", "15. Life on land", "BIOMASS PRODUCTION", "SOIL HETEROTROPHS", "01 natural sciences", "CAREX DECIDUA", "13. Climate action", "DENDROBAENA OCTAEDRA", "https://purl.org/becyt/ford/1.6", "0401 agriculture", " forestry", " and fisheries", "GLOBAL WARMING", "GLOBAL CHANGE", "OZONE DEPLETION", "https://purl.org/becyt/ford/1"]}, "links": [{"href": "https://doi.org/10.1111/j.1365-2486.2009.01970.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Global%20Change%20Biology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1365-2486.2009.01970.x", "name": "item", "description": "10.1111/j.1365-2486.2009.01970.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1365-2486.2009.01970.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-09-04T00:00:00Z"}}, {"id": "10.2307/1940889", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:20:33Z", "type": "Journal Article", "created": "2006-05-09", "title": "Effects Of Invasion Of An Aspen Forest (Canada) By Dendrobaena-Octaedra (Lumbricidae) On Plant-Growth", "description": "Effects of invasion of an aspen forest in the Canadian Rocky Mountains by the earthworm Dendrobaena octaedra (Savigny) on nutrient mineralization, soil microflora, and plant growth were investigated during the growth period of 1992. Experimental chambers with reconstructed forest floor were placed in the field and destructively sampled after 7 and 14 wk. D. octaedra enhanced the shoot biomass of the grass Agropyron trachycaulum (Link) Malte (Poaceae) and increased the shoot\uffe2\uff80\uff94to\uffe2\uff80\uff94root ratio during early plant growth. Microbial biomass, basal respiration and respiratory quotient qCO2 in L/F layer material were reduced by D. octaedra but increased in the H layer. The nutrient (NH4+, NO3\uffe2\uff80\uff94, PO43\uffe2\uff80\uff94) content in soil was also affected by D. octaedra but the effects were small. Effects of the earthworms on soil nutrient content were masked by the great variation in the data and by leaching of nutrients from experimental chambers.
", "keywords": ["roots", "microbes and plants", "soil chemistry", "growth", "populus", "microflora and plants", "Invasion effects on nutrients", "Alberta", "forest soils", "microflora and plants in aspen forest", "Dendrobaena octaedra (Oligochaeta): Element cycles", "Forest and woodland", "nutrients", "biomass production", "Invasion consequences for ecosystem processes in forest soils", "impacts of invasion in aspen forest soils", "mineralization", "Annelids", "effects", "invasion impacts on ecosystem processes", "forests", "2. Zero hunger", "plant morphology", "effects on nutrients", "biomass", "soil fertility", "grasslands", "Habitat colonization", "KananaskisValley", "woodland grasslands", "Dispersal", "04 agricultural and veterinary sciences", "15. Life on land", "invasion", "Invasion of aspen forest soils effects on nutrients", "Invertebrates", "soil biology", "introduced species", "Soil habitat", "Aspen forest soils", "Nutrient mineralization", "0401 agriculture", " forestry", " and fisheries", "dendrobaena", "Impact on habitat", "root shoot ratio", "elymus trachycaulus", "soil fauna", "forest trees", "shoots"], "contacts": [{"organization": "Scheu, Stefan, Parkinson, Dennis,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.2307/1940889"}, {"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": "10.2307/1940889", "name": "item", "description": "10.2307/1940889", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2307/1940889"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1994-12-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=dendrobaena&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=dendrobaena&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=dendrobaena&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=dendrobaena&offset=2", "hreflang": "en-US"}], "numberMatched": 2, "numberReturned": 2, "distributedFeatures": [], "timeStamp": "2026-07-26T13:10:59.739654Z"}