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Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.contributor | University of Washington, School of Environmental and Forest Sciences | - |
Autor(es): dc.contributor | Universidade Estadual Paulista (UNESP) | - |
Autor(es): dc.creator | James, Jason | - |
Autor(es): dc.creator | Knight, Erika | - |
Autor(es): dc.creator | Gamba, Vitor [UNESP] | - |
Autor(es): dc.creator | Harrison, Rob | - |
Data de aceite: dc.date.accessioned | 2022-08-04T22:04:18Z | - |
Data de disponibilização: dc.date.available | 2022-08-04T22:04:18Z | - |
Data de envio: dc.date.issued | 2022-04-28 | - |
Data de envio: dc.date.issued | 2022-04-28 | - |
Data de envio: dc.date.issued | 2015-01-05 | - |
Fonte completa do material: dc.identifier | http://dx.doi.org/10.1016/j.foreco.2014.10.010 | - |
Fonte completa do material: dc.identifier | http://hdl.handle.net/11449/220251 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/11449/220251 | - |
Descrição: dc.description | Nitrogen (N) is one of the primary limiting nutrients in Pacific Northwest forests, as well as many other terrestrial ecosystems around the world. Efforts to quantify total soil N and to monitor N cycling have often sampled soils to a depth of 0.2m, occasionally to 1.0m depth, or the bottom of the B horizon. However, tree roots often extend many meters into the soil redistributing water to the surface during droughts and contributing to nutrient uptake. This study examined the systematic sampling depth for ecosystem N analyses in the Pacific Northwest, and compared best-fit models of N in deep soil layers with observed quantities. At 22 sites across the Pacific Northwest Douglas-fir zone, O horizon and mineral soil bulk density samples were collected at depths of 0.1m, 0.5m, 1.0m, 1.5m, 2.0m, and 2.5m. Mineral soil was screened to 4.75mm and analyzed for total N content. Systematic sampling shallower than 2.0m produced significantly smaller estimates of total N. On average, only 3% of total soil N was in the O horizon, and 31% was below 1.0m depth (almost 2700kgha-1 of N). Over 45% of soil N was below 1.0m at three sites. A nonlinear mixed effect model using the Langmuir equation predicted total N to 2.5m with -12.4% mean error given data to 1.0m, and -7.6% mean error with data to 1.5m. Shallow sampling of soil N in studies of biogeochemical cycling, forest management impacts, or ecosystem monitoring at best provides a biased estimate and at worst produces misleading conclusions. Research and monitoring efforts seeking to quantify soil N or measure fluxes should sample deep soil to create a more complete picture of soil pools and changes over time. | - |
Descrição: dc.description | University of Washington, School of Environmental and Forest Sciences, Box 352100 | - |
Descrição: dc.description | São Paulo State University, College of Agricultural Sciences | - |
Descrição: dc.description | São Paulo State University, College of Agricultural Sciences | - |
Formato: dc.format | 194-202 | - |
Idioma: dc.language | en | - |
Relação: dc.relation | Forest Ecology and Management | - |
???dc.source???: dc.source | Scopus | - |
Palavras-chave: dc.subject | Deep soil | - |
Palavras-chave: dc.subject | Douglas-fir | - |
Palavras-chave: dc.subject | Forest management | - |
Palavras-chave: dc.subject | Forest soil | - |
Palavras-chave: dc.subject | Nitrogen cycling | - |
Palavras-chave: dc.subject | Sampling depth | - |
Título: dc.title | Deep soil: Quantification, modeling, and significance of subsurface nitrogen | - |
Tipo de arquivo: dc.type | livro digital | - |
Aparece nas coleções: | Repositório Institucional - Unesp |
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