DOI: 10.1007/s10533-016-0259-8
Scopus记录号: 2-s2.0-84991087301
论文题名: Small scale variability of vertical water and dissolved organic matter fluxes in sandy Cambisol subsoils as revealed by segmented suction plates
作者: Leinemann T. ; Mikutta R. ; Kalbitz K. ; Schaarschmidt F. ; Guggenberger G.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 131, 期: 2018-01-02 语种: 英语
英文关键词: Beech forest
; DOC flux
; Segmented suction plates
; Small scale variability
; SUVA
Scopus关键词: absorbance
; Cambisol
; carbon flux
; concentration (composition)
; deciduous forest
; dissolved organic matter
; heterogeneity
; organic carbon
; sandy soil
; soil water
; subsoil
; suction
; translocation
; ultraviolet radiation
; Germany
; Hannover
; Lower Saxony
; Fagus
英文摘要: Dissolved organic matter (DOM) is considered as a major carbon source in subsoils. As soil water fluxes are highly variable at small scale, and transport versus sorptive retention of DOM is related to water flux and associated contact time with minerals, knowledge of the small scale spatial variability of the dissolved organic carbon (DOC) concentrations and fluxes into the subsoil is decisive for a solid estimation of organic carbon (OC) translocation into the subsoil. Here, we made advantage of novel segmented suction plates (4 × 4 segments, each 36 cm2) to analyze the small scale spatial and temporal variability of DOC transport at 10, 50 and 150 cm depth of three subsoil observatories (approximately 50 m apart) in a sandy Dystric Cambisol under beech in the Grinderwald, 40 km northwest from Hannover, Germany. Water fluxes, DOC concentrations and fluxes as well as the specific UV absorbance (SUVA) at 280 nm were determined in weekly samples from August 2014 to November 2015 for each individual segment. The DOC fluxes decreased with depth (19.6 g C m−2 year−1, 10 cm; 1.2 g C m−2 year−1, 150 cm) and were strongly related to the water fluxes. The SUVA at 280 nm also decreased with depth (0.03 L mg C−1 cm−1, 10 cm; 0.01 L mg C−1 cm−1, 150 cm), indicating a selective retention of aromatic moieties, that was eased with increasing water flux at least in the subsoil. The proportion of temporal fluctuations and small scale variability on the total variance of each parameter where determined by the calculation of intra class correlations. The seasonal heterogeneity and the small scale spatial heterogeneity were identified to be of major importance. The importance of the small scale spatial heterogeneity strongly increased with depth, pointing towards the stability of flow paths and suggesting that at a given substrate hydrological processes rather than physicochemical processes are decisive for the sorptive retention of DOM and the variability of OC accumulation in the subsoil. Our results clearly show the demand of small scale sampling for the identification of processes regarding carbon cycling in the subsoil. © 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/83331
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: Institute of Soil Science, Leibniz Universität Hannover, Herrenhäuser Straße 2, Hannover, Germany; Soil Science and Soil Protection, Martin Luther University Halle-Wittenberg, Von-Seckendorff-Platz 3, Halle (Saale), Germany; Institute of Soil Science and Site Ecology, Technische Universität Dresden, Pienner Strasse 19, Tharandt, Germany; Institute of Biostatistics, Leibniz Universität Hannover, Herrenhäuser Straße 2, Hannover, Germany
Recommended Citation:
Leinemann T.,Mikutta R.,Kalbitz K.,et al. Small scale variability of vertical water and dissolved organic matter fluxes in sandy Cambisol subsoils as revealed by segmented suction plates[J]. Biogeochemistry,2016-01-01,131(2018-01-02)