DOI: 10.1007/s10533-016-0181-0
Scopus记录号: 2-s2.0-84959471437
论文题名: Retention and removal of nitrogen and phosphorus in saturated soils of arctic hillslopes
作者: Harms T.K. ; Ludwig S.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 127, 期: 2018-02-03 起始页码: 291
结束页码: 304
语种: 英语
英文关键词: Ammonium (NH4 +)
; Arctic
; Hillslope
; Nitrate (NO3 −)
; Phosphate (PO4 3−)
; Water residence time
Scopus关键词: ammonium compound
; flow pattern
; hillslope
; in situ measurement
; inorganic nitrogen
; inorganic phosphorus
; nitrate
; nutrient cycling
; residence time
; saturated medium
; soil chemistry
; substrate
; water retention
; Arctic
英文摘要: Interaction of hydrologic and biogeochemical processes on hillslopes may contribute significantly to export of nutrients from soils to stream networks, yet hillslopes remain poorly understood components of catchments. In the arctic, hillslopes are underlain by permafrost, and drained by zero-order channels called water tracks that contain perennial subsurface flow. We conducted in situ experiments to measure retention of inorganic nitrogen (N) and phosphorus (P) by saturated soils of water tracks and investigated the roles of water residence time, flowpath depth, and substrate availability in determining the balance of reaction and transport of nutrients. Net retention of P was observed in 46 % of experiments, and net retention or removal of nitrate (Formula presented.) was observed in 57 % of experiments, whereas net retention of ammonium (Formula presented.) occurred in only 16 % of experiments performed. Net production of (Formula presented.) occurred in 42 % of experiments, was more frequently observed than retention, and was most rapid where water residence time was shortest. P retention was enhanced by P availability, suggesting strong capacity to buffer downslope fluxes of inorganic P in water tracks. Net retention or removal of (Formula presented.) tended to occur in shallow flowpaths, but was not detected in deeper soils. Strong retention of inorganic P by saturated arctic soils indicates that hillslopes contribute to regulating the flux of P to downstream ecosystems, whereas weaker retention of inorganic N, particularly where flows are deep or rapid, suggests that increased discharge from hillslopes and deeper thaw will contribute to increased export of N. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83415
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: Department of Biology & Wildlife and Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Harms T.K.,Ludwig S.M.. Retention and removal of nitrogen and phosphorus in saturated soils of arctic hillslopes[J]. Biogeochemistry,2016-01-01,127(2018-02-03)