Item talk:Q247253
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{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Identifying sources of dissolved organic carbon in agriculturally dominated rivers using radiocarbon age dating: Sacramento-San Joaquin River Basin, California", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70003527", "url": "https://pubs.usgs.gov/publication/70003527" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70003527 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1007/s10533-009-9391-z", "url": "https://doi.org/10.1007/s10533-009-9391-z" } ], "journal": { "@type": "Periodical", "name": "Biogeochemistry", "volumeNumber": "99", "issueNumber": "1" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Biogeochemistry" } ], "datePublished": "2010", "dateModified": "2017-04-25", "abstract": "We used radiocarbon measurements of dissolved organic carbon (DOC) to resolve sources of riverine carbon within agriculturally dominated landscapes in California. During 2003 and 2004, average \u039414C for DOC was \u2212254\u2030 in agricultural drains in the Sacramento\u2013San Joaquin Delta, \u2212218\u2030 in the San Joaquin River, \u2212175\u2030 in the California State Water Project and \u2212152\u2030 in the Sacramento River. The age of bulk DOC transiting the rivers of California\u2019s Central Valley is the oldest reported for large rivers and suggests wide-spread loss of soil organic matter caused by agriculture and urbanization. Using DAX 8 adsorbent, we isolated and measured 14C concentrations in hydrophobic acid fractions (HPOA); river samples showed evidence of bomb-pulse carbon with average \u039414C of 91 and 76\u2030 for the San Joaquin and Sacramento Rivers, respectively, with older HPOA, \u2212204\u2030, observed in agricultural drains. An operationally defined non-HPOA fraction of DOC was observed in the San Joaquin River with seasonally computed \u039414C values of between \u2212275 and \u2212687\u2030; the source of this aged material was hypothesized to be physically protected organic-matter in high clay-content soils and agrochemicals (i.e., radiocarbon-dead material) applied to farmlands. Mixing models suggest that the Sacramento River contributes about 50% of the DOC load in the California State Water Project, and agricultural drains contribute approximately one-third of the load. 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Lee", "givenName": "M. Lee", "familyName": "Davisson" } ], "funder": [ { "@type": "Organization", "name": "California Water Science Center", "url": "https://www.usgs.gov/centers/california-water-science-center" } ], "spatialCoverage": [ { "@type": "Place", "additionalType": "country", "name": "United States", "url": "https://geonames.org/4074035" }, { "@type": "Place", "additionalType": "state", "name": "California" }, { "@type": "Place", "additionalType": "state", "name": "San Joaquin" }, { "@type": "Place", "additionalType": "state", "name": "Sacramento" }, { "@type": "Place", "additionalType": "state", "name": "Contra Costa" }, { "@type": "Place", "additionalType": "state", "name": "Solano" }, { "@type": "Place", "additionalType": "unknown", "name": "San Joaquin Delta" }, { "@type": "Place", "additionalType": "unknown", "name": "San Joaquin River", "url": "https://geonames.org/5392159" }, { "@type": "Place", "additionalType": "unknown", "name": "Sacramento River", "url": "https://geonames.org/5389630" }, 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