DOI: 10.1007/s10533-017-0325-x
Scopus记录号: 2-s2.0-85016092282
论文题名: Evolution of particulate organic matter (POM) along a headwater drainage: role of sources, particle size class, and storm magnitude
作者: Rowland R. ; Inamdar S. ; Parr T.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 2 起始页码: 181
结束页码: 200
语种: 英语
英文关键词: Aquatic ecosystems
; Nitrogen
; Organic carbon
; Runoff
; Storm events
; Watersheds
Scopus关键词: aquatic ecosystem
; Bayesian analysis
; drainage
; forest floor
; headwater
; nitrogen
; particle size
; particulate organic matter
; rainfall-runoff modeling
; runoff
; stable isotope
; storm
; watershed
; Piedmont [United States]
; United States
; Tracheophyta
英文摘要: Large storm events can not only increase the runoff mass exports of particulate organic matter (POM) from watersheds, but can also alter the sources, size distribution, and composition of POM. We investigated the quantity, particle size distribution, carbon (C) and nitrogen (N) content, and sources of POM for five locations longitudinally along a forested Piedmont stream. POM was sampled for multiple storm events of varying magnitude and intensity over a two-year period. POM was separated into coarse (CPOM), medium (MPOM), and fine (FPOM) size classes, and sources were estimated using stable isotopes of 13C and 15N with a Bayesian mixing model. CPOM largely resembled less-degraded vascular plant material characteristic of forest floor litter, which was estimated to contribute to ~40% of CPOM in upstream locations. FPOM was derived from a more variable mixture of sources with stream beds and stream banks playing a greater role at larger drainage locations (up to ~50 and ~30%, respectively). Contributions from both forest floor litter and humus to CPOM increased with increasing event runoff, and litter contributions increased during events with higher rainfall intensities. Higher C and N content was noted in coarse sediments and finer POM fractions appeared to be more degraded based on C:N and isotope ratios. Climate-change projections predict intensification of large storm events in the Northeastern US. Results of this study suggest that large storms will increase the fluvial exports of coarse, labile, C- and N-rich POM with subsequent impacts on receiving aquatic ecosystems. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83285
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Water Science & Policy Graduate Program, University of Delaware, 152 Townsend Hall, 531 S College Avenue, Newark, DE, United States; Plant and Soil Science Department, University of Delaware, Newark, DE, United States
Recommended Citation:
Rowland R.,Inamdar S.,Parr T.. Evolution of particulate organic matter (POM) along a headwater drainage: role of sources, particle size class, and storm magnitude[J]. Biogeochemistry,2017-01-01,133(2)