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Mandatory Fields
Meng, YT,Ding, SM,Gong, MD,Chen, MS,Wang, Y,Fan, XF,Shi, L,Zhang, CS
2018
March
Chemosphere
Submillimeter-scale heterogeneity of labile phosphorus in sediments characterized by diffusive gradients in thin films and spatial analysis
Published
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Optional Fields
Geographical information system (GIS) Semivariogram Moran's I Lake Taihu HIGH-RESOLUTION EUTROPHIC LAKE MORANS I REACTIVE PHOSPHORUS ANOXIC SEDIMENTS RELEASE GEOSTATISTICS LIMITATION SPECIATION SULFIDE
194
614
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Sediments have a heterogeneous distribution of labile redox-sensitive elements due to a drastic downward transition from oxic to anoxic condition as a result of organic matter degradation. Characterization of the heterogeneous nature of sediments is vital for understanding of small-scale biogeochemical processes. However, there are limited reports on the related specialized methodology. In this study, the monthly distributions of labile phosphorus (P), a redox-sensitive limiting nutrient, were measured in the eutrophic Lake Taihu by Zr-oxide diffusive gradients in thin films (Zr-oxide DGT) on a two-dimensional (2D) submillimeter level. Geographical information system (GIS) techniques were used to visualize the labile P distribution at such a micro-scale, showing that the DGT-labile P was low in winter and high in summer. Spatial analysis methods, including semivariogram and Moran's I, were used to quantify the spatial variation of DGT-labile P. The distribution of DGT-labile P had clear submillimeter-scale spatial patterns with significant spatial autocorrelation during the whole year and displayed seasonal changes. High values of labile P with strong spatial variation were observed in summer, while low values of labile P with relatively uniform spatial patterns were detected in winter, demonstrating the strong influences of temperature on the mobility and spatial distribution of P in sediment profiles. (C) 2017 Elsevier Ltd. All rights reserved.
10.1016/j.chemosphere.2017.11.178
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