DOI: 10.1007/s00027-020-0704-6
论文题名: Dynamics of dissolved organic matter in headwaters: comparison of headwater streams with contrasting DOM and nutrient composition
作者: Fovet O. ; Cooper D.M. ; Jones D.L. ; Jones T.G. ; Evans C.D.
刊名: Aquatic Sciences
ISSN: 10151621
出版年: 2020
卷: 82, 期: 2 语种: 英语
英文关键词: Biogeochemical cycling
; Dissolved organic carbon DOC
; Headwaters
; Photo-degradation
Scopus关键词: biogeochemical cycle
; dissolved organic matter
; headwater
; nutrient availability
; nutrient enrichment
; photodegradation
英文摘要: Dissolved organic matter (DOM) in freshwaters is recognised as a significant and active component of the global carbon budget. DOM exported from terrestrial ecosystems may be compositionally and functionally altered by chemical and biological reactions as it is transported downstream. The processes affecting DOM in headwater streams remain uncertain but are potentially highly variable depending on DOM composition and nutrient availability as a function of soils, land-use, and human pressures. To investigate variability of DOM reactivity we took water samples from two contrasting headwater catchments, considered functional ‘end-members’ for DOM export: one rich in aromatic DOM and low in inorganic nutrients (peatland), and another (nearby) catchment characterized by less aromatic DOM and high nutrient loadings (agricultural grassland). Under controlled laboratory conditions, we evaluated the effects of light, presence/absence of aquatic biota and nutrient enrichment on short-term changes in DOM quantity and quality in these samples. For the peat stream, exposure to sunlight (with UV) resulted in net abiotic DOM removal, whereas in the agricultural stream it led to net biological DOM production. Nutrient addition accelerated DOM production in both streams. We conclude that in-stream changes in DOM quantity and quality represent the net effect of multiple consumption and production processes whose relative importance is strongly influenced by source-dependent DOM composition and environmental factors such as inorganic nutrient content and sunlight exposure. Our findings suggest that headwater streams may be more active processors of carbon and nutrients than presumed hitherto. © 2020, Springer Nature Switzerland AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158607
Appears in Collections: 气候变化与战略
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作者单位: UMR SAS, INRAE, AGROCAMPUS OUEST, Rennes, 35000, France; UK Centre for Ecology and Hydrology, Bangor, LL57 2UW, United Kingdom; School of Natural Sciences, Bangor University, Bangor, LL57 2UW, United Kingdom; Soils West, UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA 6009, Australia
Recommended Citation:
Fovet O.,Cooper D.M.,Jones D.L.,et al. Dynamics of dissolved organic matter in headwaters: comparison of headwater streams with contrasting DOM and nutrient composition[J]. Aquatic Sciences,2020-01-01,82(2)