{"title":"TERENO - Holtemme - Germany","id":{"prefix":"https:\/\/deims.org\/","suffix":"0d0422f5-596c-433b-bb5d-d51bd76703a0"},"type":"site","created":"2023-03-10T10:27:06+01:00","changed":"2025-05-14T12:00:03+02:00","attributes":{"affiliation":{"networks":[{"network":{"name":"GERI","id":{"prefix":"https:\/\/deims.org\/networks\/","suffix":"c3abdc60-49f1-49db-81fe-863b7dbb21d3"}},"siteCode":null,"verified":true},{"network":{"name":"ILTER","id":{"prefix":"https:\/\/deims.org\/networks\/","suffix":"1aa7ccb2-a14b-43d6-90ac-5e0a6bc1d65b"}},"siteCode":null,"verified":true},{"network":{"name":"LTER Europe","id":{"prefix":"https:\/\/deims.org\/networks\/","suffix":"4742ffca-65ac-4aae-815f-83738500a1fc"}},"siteCode":null,"verified":true},{"network":{"name":"LTER-D (Germany)","id":{"prefix":"https:\/\/deims.org\/networks\/","suffix":"e904354a-f3a0-40ce-a9b5-61741f66c824"}},"siteCode":null,"verified":true}],"projects":null},"contact":{"siteManager":[{"type":"person","name":"Mario Brauns","email":"mario.brauns@ufz.de","orcid":"https:\/\/orcid.org\/0000-0002-5012-9721"},{"type":"person","name":"Patrick Fink","email":"patrick.fink@ufz.de","orcid":null}],"operatingOrganisation":[{"type":"organisation","name":"UFZ Helmholtz Centre for Environmental Research","url":"http:\/\/www.ufz.de","ror":"https:\/\/ror.org\/000h6jb29"}],"metadataProvider":[{"type":"person","name":"Mario Brauns","email":"mario.brauns@ufz.de","orcid":"https:\/\/orcid.org\/0000-0002-5012-9721"}],"fundingAgency":null,"siteUrl":[{"title":null,"value":"https:\/\/www.ufz.de\/index.php?en=51210"}]},"general":{"abstract":"The Holtemme River is a third-order river that originates in the Harz National Park in Germany, at an elevation of 862 meters above sea level. It flows for 47 kilometers before merging with the Bode River. The catchment area covers 282 square kilometers and is primarily composed of Mesozoic rocks, which are overlain by Tertiary and Quaternary sediments. Land use in the catchment demonstrates a typical progression from previously forested headwaters to agricultural and urban areas downstream. Consequently, the river\u0027s hydromorphology is almost natural in the upstream reach, while it becomes highly altered downstream due to channelization, riparian clear-cutting, and incision in urban and agricultural areas. In addition to potential diffuse sources of chemicals from agriculture, the river receives significant nutrient inputs and a wide range of pollutants from point sources. This includes two wastewater treatment plants (WWTP), each serving a population equivalent of more than 60,000, as well as tributaries draining agricultural areas. With this increasing human impact, the Holtemme River serves as a typical example of a multiple-stressed ecosystem. Thus, it provides a valuable model site for studying the effects of various human stressors on ecosystem structure and function. Since 2017, the upstream catchment has experienced substantial forest dieback due to bark beetle infestations, resulting in over 80% of the previously forested catchment area becoming unforested.","citation":null,"relatedIdentifiers":null,"status":{"label":"Operational","uri":"http:\/\/vocabs.lter-europe.net\/elter_cl\/10772"},"yearEstablished":2018,"yearClosed":null,"relatedSites":[{"typeOfRelationship":{"label":"belongs to","uri":"null"},"listOfSites":[{"type":"site","title":"TERENO - Hohes Holz - Germany","id":{"prefix":"https:\/\/deims.org\/","suffix":"ddd2e8d2-44db-420e-8fa4-6b4fe1b00c78"},"changed":"2026-03-30T14:33:12+0200"}]}],"siteName":"TERENO - Holtemme","shortName":"Holtemme","siteType":"Stationary land-based site","protectionLevel":[{"label":"Category V \u2013 Protected Landscape\/Seascape\/Area","uri":"http:\/\/dd.eionet.europa.eu\/vocabularyconcept\/cdda\/IucnCategoryValue\/V"}],"landUse":[{"label":"forestry based on continuous cover","uri":"https:\/\/inspire.ec.europa.eu\/codelist\/HILUCSValue\/1_2_3_ForestryBasedOnContinuousCover"},{"label":"renewable energy production","uri":"https:\/\/inspire.ec.europa.eu\/codelist\/HILUCSValue\/2_4_4_RenewableEnergyProduction"}],"images":[{"url":"https:\/\/deims.org\/sites\/default\/files\/2025-03\/Holtemme%20upstream.jpg","alt":"Holtemme: Upstream reach subjected to forest dieback"},{"url":"https:\/\/deims.org\/sites\/default\/files\/2025-03\/Holtemme%20SR.jpg","alt":"Holtemme: Forested upstream reach"},{"url":"https:\/\/deims.org\/sites\/default\/files\/2025-03\/Holtemme%20Nienhagen.jpg","alt":"Holtemme: Multiple stressed downstream reach"}]},"environmentalCharacteristics":{"airTemperature":{"yearlyAverage":8.9,"monthlyAverage":null,"unit":"\u00b0C","referencePeriod":{"label":"1981 - 2010","uri":null}},"precipitation":{"yearlyAverage":630,"monthlyAverage":null,"unit":"mm","referencePeriod":{"label":"1981 - 2010","uri":null}},"biogeographicalRegion":"continental","biome":"freshwater_rivers","ecosystemType":[{"label":"Fresh Water Rivers","uri":null},{"label":"Small rivers","uri":null}],"eunisHabitat":[{"label":"Permanent non-tidal, fast, turbulent watercourses (C2.2)","uri":null}],"landforms":[{"label":"Mountain","uri":null},{"label":"River","uri":null}],"geoBonBiome":["Fresh water rivers"],"geology":null,"hydrology":null,"soils":null,"vegetation":null},"geographic":{"boundaries":"POLYGON ((10.67663 51.797188, 10.668014 51.80464, 10.757611 51.851193, 10.836618 51.867175, 11.187236 51.969691, 11.201506 51.95182, 11.16683 51.930444, 10.757718 51.816171, 10.67663 51.797188))","coordinates":"POINT (10.724797 51.816938)","country":["Germany"],"elevation":{"avg":474,"min":86,"max":862,"unit":"msl"},"size":{"value":11905.17,"unit":"ha"},"relatedLocations":null},"focusDesignScale":{"experiments":{"design":"partly experimentation","scale":"plot scale"},"observations":{"design":"partly observation","scale":"plot within catchment"},"observedProperties":[{"label":"ammonium content","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10071"},{"label":"ammonium nitrate concentration","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10072"},{"label":"ammonium nitrogen content","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10076"},{"label":"biological oxygen demand","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22068"},{"label":"chlorophyll content of water","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10088"},{"label":"conductivity","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22089"},{"label":"dissolved organic carbon in water","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10307"},{"label":"dissolved organic nitrogen","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10125"},{"label":"electrical conductivity","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/21552"},{"label":"groundwater level","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22126"},{"label":"land cover","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22142"},{"label":"land use","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22143"},{"label":"landscape parameter","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/20943"},{"label":"nitrogen content","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22174"},{"label":"oxygen concentration","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/30179"},{"label":"oxygen saturation","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/21215"},{"label":"photosynthetically active radiation intensity","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22186"},{"label":"river temperature","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10015"},{"label":"stream order","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/21511"},{"label":"total carbon","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22296"},{"label":"total organic carbon","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22297"},{"label":"water acidity","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22030"},{"label":"water alkalinity","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10303"},{"label":"water depth","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22310"},{"label":"water heavy metal concentration","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/30024"},{"label":"water level","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/30025"},{"label":"water parameter","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/20945"},{"label":"water quality","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22312"},{"label":"water salinity","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10308"},{"label":"water temperature","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22313"},{"label":"water velocity","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22315"},{"label":"water volume","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22316"}]},"infrastructure":{"accessibleAllYear":true,"accessType":"paved road","allPartsAccessible":true,"maintenanceInterval":30,"permanentPowerSupply":true,"operation":{"permanent":true,"notes":null,"siteVisitInterval":30},"notes":null,"collection":[{"label":"Central station(s)","uri":null},{"label":"Data portal","uri":null},{"label":"Probe continuous measurements","uri":null},{"label":"Relational database","uri":null},{"label":"Telephone line","uri":null}],"data":{"policy":{"url":null,"rights":null,"notes":null}}},"relatedResources":null,"projectRelated":{"lter":{"lterSiteClassification":"Regular Site"}}}}