{"accessLimitation":{"value":"noLimitations","availability":"Available","description":"Access to the resource is not subject to any access limitations and is available to all users without restriction.","uri":"http://vocab.nerc.ac.uk/collection/N07/current/UNRS/"},"authors":[{"familyName":"Trimmer","givenName":"Mark","organisationName":"Queen Mary University of London","organisationIdentifier":"https://ror.org/026zzn846","role":"author","email":"m.trimmer@qmul.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-9859-5537","fullName":"Trimmer, M."}],"availability":"Available","boundingBoxes":[{"westBoundLongitude":0.797,"eastBoundLongitude":0.821,"southBoundLatitude":51.007,"northBoundLatitude":51.02,"bounds":"{\"type\": \"Feature\",      \"properties\": {},      \"geometry\": {        \"type\": \"Polygon\",        \"coordinates\": [[[0.797, 51.007], [0.797, 51.02], [0.821, 51.02], [0.821, 51.007], [0.797, 51.007]]]      }}","coordinates":"[[[0.797, 51.007], [0.797, 51.02], [0.821, 51.02], [0.821, 51.007], [0.797, 51.007]]]"}],"citation":{"authors":["Trimmer, M."],"bibtex":"https://catalogue.ceh.ac.uk/documents/7ded510f-3955-4b92-851d-29c0f79a0b99/citation?format=bib","day":8,"doi":"10.5285/7ded510f-3955-4b92-851d-29c0f79a0b99","month":8,"publisher":"NERC Environmental Information Data Centre","resourceTypeGeneral":"dataset","ris":"https://catalogue.ceh.ac.uk/documents/7ded510f-3955-4b92-851d-29c0f79a0b99/citation?format=ris","title":"The influence of large woody debris (LWD) on in situ riverbed nitrogen transformations in the Hammer Stream (Hampshire, UK)","url":"https://doi.org/10.5285/7ded510f-3955-4b92-851d-29c0f79a0b99","year":2018},"custodians":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"}],"datasetReferenceDate":{"creationDate":"2018-07-12","publicationDate":"2018-08-08"},"description":"This dataset contains results from in situ field measurements of riverbed nitrogen transformations in the Hammer Stream, a sandy tributary of the River Rother in West Sussex, UK. Measurements were performed in November 2014 and February, April and July 2015. The data include baseline concentrations of nutrients (NO2, NO3, NH3, PO4), chloride, oxygen, pH, temperature, Fe(II), organic carbon, 15N-N2 and methane (CH4) and nitrous oxide (N2O) sampled from porewater prior to injection of 15N-nitrate.","distributionFormats":[{"name":"Comma-separated values (CSV)","type":"text/csv","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"funding":[{"funderName":"Natural Environment Research Council","funderIdentifier":"https://ror.org/02b5d8509","orcid":false,"ror":true}],"id":"7ded510f-3955-4b92-851d-29c0f79a0b99","incomingCitationCount":1,"incomingCitations":[{"description":"Shen, L., Ouyang, L., Zhu, Y., & Trimmer, M. (2018). Active pathways of anaerobic methane oxidation across contrasting riverbeds. In The ISME Journal (Vol. 13, Issue 3, pp. 752–766). Oxford University Press (OUP).","url":"https://doi.org/10.1038/s41396-018-0302-y"}],"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/7ded510f-3955-4b92-851d-29c0f79a0b99.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Environmental Monitoring Facilities","uri":"http://inspire.ec.europa.eu/theme/ef"}],"keywordsOther":[{"value":"pH"},{"value":"temperature"},{"value":"nitrous oxide"},{"value":"nitrite","uri":"http://www.eionet.europa.eu/gemet/concept/5601"},{"value":"nitrogen","uri":"http://www.eionet.europa.eu/gemet/concept/5605"},{"value":"methane","uri":"http://www.eionet.europa.eu/gemet/concept/5199"},{"value":"organic carbon","uri":"http://www.eionet.europa.eu/gemet/concept/5892"},{"value":"iron","uri":"http://www.eionet.europa.eu/gemet/concept/4498"},{"value":"chloride","uri":"http://www.eionet.europa.eu/gemet/concept/1366"},{"value":"oxygen","uri":"http://www.eionet.europa.eu/gemet/concept/5982"},{"value":"phosphate","uri":"http://www.eionet.europa.eu/gemet/concept/6189"},{"value":"ammonium","uri":"http://www.eionet.europa.eu/gemet/concept/379"},{"value":"nitrite","uri":"http://www.eionet.europa.eu/gemet/concept/5601"},{"value":"nitrate","uri":"http://www.eionet.europa.eu/gemet/concept/5593"}],"keywordsTheme":[{"value":"Water quality","uri":"http://onto.nerc.ac.uk/CEHMD/topic/16"}],"licences":[{"value":"This resource is made available under the terms of the Open Government Licence","code":"license","uri":"https://eidc.ac.uk/licences/ogl/plain"}],"lineage":"Prior to injection of 15N-nitrate, samples of porewater were recovered to measure background concentrations of nutrients (NO2, NO3, NH3, PO4), chloride, oxygen, pH, temperature, Fe(II), organic carbon, 15N-N2 and methane (CH4) and nitrous oxide (N2O). \n\nConcentration of dissolved oxygen in porewater sampled prior to 15N injection. Units are micro-M. Porewater was transferred from the collection syringe to an open syringe barrel containing an oxygen sensor via a 3-way valve. O2 concentrations were measured with a fast response microelectrode (50microm tip, Unisense). Readings from the microelectrode were displayed on a pico-ammeter (PA 2000; Unisense) and logged after 4s when the signal had stabilized. Calibration was performed with a zero solution (0.1M sodium ascorbate in 0.1M sodium hydroxide) and a solution of known O2 concentration (determined via Winkler titration). Through laboratory simulation with de-oxygenated water we estimate that O2 contamination during sample transfer and measurement was 10micro-M and have subtracted this value from the data. The limit of detection was 10micro-M and the precision was 2%.\n\nO2adj percent: Saturation of dissolved oxygen expressed relative to air-equilibrated water at the temperature of the sample. Units are %. The air-equilibrated O2 concentration was calculated for each sample using the Bunsen solubility coefficient for O2 and the temperature of the sample (determined during pH measurement, see below). O2 sat = 100 x O2adj (see above) divided by the air-equilibrated O2 concentration.\n\npH of porewater sample prior to 15N injection. After the O2 concentration of the porewater was measured (see above) a calibrated pH probe (VWR 100) was placed in the solution and the temperature and pH was recorded.\n\nTemperature units are degrees centigrade.\n\nWater samples for nutrients were filtered through 0.45 micron filters (polypropylene). Samples for nutrient analysis were frozen at -20ºC before analysis.\nIn the permeable sandy sediments, nitrate reduction was measured by 'push-pull' using techniques in Lansdown et al. (2014). In the main piezometer network described in Shelley et al (2017), a tracer containing 15N-labelled nitrate (300 micro-M (M), 98 atom percent 15N) in a de-oxygenated synthetic river water plus KCl matrix was injected into the riverbed and porewater samples recovered over time (Lansdown et al. (2014)). A helium headspace was added to the water samples, the 15N-labelled N2 content was determined by mass spectrometry.\n\nData marked as 0 were below the detection limit of the method. Data marked ND were either no data collected or a sample lost.","metadataDate":"2026-06-29T16:30:45","notGEMINI":false,"onlineResources":[{"url":"https://catalogue.ceh.ac.uk/datastore/eidchub/7ded510f-3955-4b92-851d-29c0f79a0b99/","name":"Download the data","description":"Download a copy of this data","function":"fileAccess","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/7ded510f-3955-4b92-851d-29c0f79a0b99.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"pointsOfContact":[{"honorificPrefix":"Professor","familyName":"Trimmer","givenName":"Mark","organisationName":"Queen Mary University of London","organisationIdentifier":"https://ror.org/026zzn846","role":"pointOfContact","email":"m.trimmer@qmul.ac.uk","address":{"deliveryPoint":"Mile End Road","city":"London","postalCode":"E1 4NS","country":"UK"},"fullName":"Trimmer, M.","pointOfContact":"Queen Mary University of London"}],"publicationDate":"2018-08-08T00:00:00.000Z","publishers":[{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"resourceIdentifiers":[{"code":"https://catalogue.ceh.ac.uk/id/7ded510f-3955-4b92-851d-29c0f79a0b99"},{"code":"10.5285/7ded510f-3955-4b92-851d-29c0f79a0b99","codeSpace":"doi"}],"resourceType":{"value":"dataset"},"responsibleParties":[{"honorificPrefix":"Professor","familyName":"Trimmer","givenName":"Mark","organisationName":"Queen Mary University of London","organisationIdentifier":"https://ror.org/026zzn846","role":"pointOfContact","email":"m.trimmer@qmul.ac.uk","address":{"deliveryPoint":"Mile End Road","city":"London","postalCode":"E1 4NS","country":"UK"},"fullName":"Trimmer, M.","pointOfContact":"Queen Mary University of London"},{"familyName":"Trimmer","givenName":"Mark","organisationName":"Queen Mary University of London","organisationIdentifier":"https://ror.org/026zzn846","role":"author","email":"m.trimmer@qmul.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-9859-5537","fullName":"Trimmer, M."},{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"},{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"}],"spatialReferenceSystems":[{"code":"http://www.opengis.net/def/crs/EPSG/0/27700","title":"OSGB 1936 / British National Grid"}],"spatialRepresentationTypes":["vector"],"supplemental":[{"description":"Shelley, F., Klaar, M., Krause, S., & Trimmer, M. (2017). Enhanced hyporheic exchange flow around woody debris does not increase nitrate reduction in a sandy streambed. Biogeochemistry, 136(3), 353-372. ","url":"https://doi.org/10.1007/s10533-017-0401-2","function":"relatedArticle"},{"description":"Krause, S., Klaar, M. J., Hannah, D. M., Mant, J., Bridgeman, J., Trimmer, M., & Manning-Jones, S. (2014). The potential of large woody debris to alter biogeochemical processes and ecosystem services in lowland rivers. Wiley Interdisciplinary Reviews: Water, 1(3), 263-275.","url":"https://doi.org/10.1002/wat2.1019","function":"relatedArticle"},{"description":"Lansdown, K., Heppell, C. M., Trimmer, M., Binley, A., Heathwaite, A. L., Byrne, P., & Zhang, H. (2015). The interplay between transport and reaction rates as controls on nitrate attenuation in permeable, streambed sediments. Journal of Geophysical Research: Biogeosciences, 120(6), 1093-1109.","url":"https://doi.org/10.1002/2014JG002874","function":"relatedArticle"}],"temporalExtents":[{"begin":"2014-11-01","end":"2017-07-31"}],"title":"The influence of large woody debris (LWD) on in situ riverbed nitrogen transformations in the Hammer Stream (Hampshire, UK)","topicCategories":[{"value":"inlandWaters","uri":"http://inspire.ec.europa.eu/metadata-codelist/TopicCategory/inlandWaters"}],"topics":["http://onto.nerc.ac.uk/CEHMD/topic/16"],"type":"dataset","uri":"https://catalogue.ceh.ac.uk/id/7ded510f-3955-4b92-851d-29c0f79a0b99","useConstraints":[{"value":"This resource is made available under the terms of the Open Government Licence","code":"license","uri":"https://eidc.ac.uk/licences/ogl/plain"},{"value":"© Natural Environment Research Council","code":"copyright"}]}