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dc.contributorVirginia Tech
dc.contributor.authorEggert, S. L.
dc.contributor.authorWallace, J. B.
dc.contributor.authorMeyer, J. L.
dc.contributor.authorWebster, J. R.
dc.date.accessioned2014-03-27T13:05:58Z
dc.date.available2014-03-27T13:05:58Z
dc.date.issued2012-09
dc.identifier.citationSue L. Eggert, J. Bruce Wallace, Judy L. Meyer, and Jackson R. Webster 2012. Storage and export of organic matter in a headwater stream: responses to long-term detrital manipulations. Ecosphere 3:art75. http://dx.doi.org/10.1890/ES12-00061.1
dc.identifier.issn2150-8925
dc.identifier.urihttp://hdl.handle.net/10919/46814
dc.description.abstractRiparian habitats provide organic matter inputs that influence stream biota and ecosystem processes in forested watersheds. Over a 13-yr period, we examined the effects of litter exclusion, small- and large-wood removal, and the addition of leaf species of varying detrital quality on organic matter standing crop and export of organic and inorganic particles in a high-gradient headwater stream. Using eight pretreatment years of export data and two pretreatment years of particulate organic matter (POM) standing crop data, we report on 21 and 15 years of continuous export and POM standing crop results, respectively. Litter exclusion resulted in the elimination of leaf standing crop by the end of year three. Wood and fine benthic organic matter (FBOM) standing crops declined significantly during the exclusion and wood removal periods, but never completely disappeared. Following the introduction of artificial wood structures for retention, the addition of fast, slow, and mixed breakdown leaves in the treatment stream resulted in significantly increased mean annual leaf standing crops. After five years of leaf addition, FBOM standing crop and fine particulate organic matter (FPOM) export remained below pre-treatment levels. The reduction in leaf standing crop in the treatment stream resulted in significant increases in FPOM (23), fine inorganic particulate (33), and gravel export (103). After small wood removal we observed significant increases in export of fine inorganic particulates (23) and gravel (73) from the treatment stream. A greater proportion of coarse and FBOM standing crop was exported from the treatment stream during the litter exclusion and small wood removal periods than from the reference stream. Following the addition of slow and mixed leaves this trend was reversed, demonstrating the importance of leaf standing crop in the retention of POM. Our long-term experiment demonstrates that the quantity and type of riparian inputs to forested headwater streams will affect POM standing crop and export of POM and sediments to downstream ecosystems, and that small wood is more critical to retaining sediments and POM in small streams than previously recognized.
dc.description.sponsorshipNational Science Foundation DEB-9207498, DEB-9629268, DEB-0212315
dc.language.isoen_US
dc.publisherEcological Society of America
dc.subjectallochthonous
dc.subjectappalachian (usa) streams
dc.subjectcoweeta hydrologic laboratory,
dc.subjectnorth carolina, usa
dc.subjectdetrital complexity
dc.subjectdetritus
dc.subjectleaf litter
dc.subjectexclusion
dc.subjectorganic matter standing crop
dc.subjectorganic matter transport
dc.subjectsediment transport
dc.subjectseston
dc.subjectstorms
dc.subjectwood
dc.subjectfood-web
dc.subjectmountain stream
dc.subjectforest-stream
dc.subjectwoody debris
dc.subjectterrestrial
dc.subjectdynamics
dc.subjectcarbon
dc.subjectretention
dc.subjectlitter
dc.subjecttransport
dc.titleStorage and export of organic matter in a headwater stream: responses to long-term detrital manipulations
dc.typeArticle - Refereed
dc.identifier.urlhttp://www.esajournals.org/doi/pdf/10.1890/ES12-00061.1
dc.date.accessed2014-03-11
dc.title.serialEcosphere
dc.identifier.doihttps://doi.org/10.1890/es12-00061.1


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