Identifying sources of organic matter in sediments of shallow lakes using multiple geochemical variables

被引:17
|
作者
Kenney, William F. [1 ]
Brenner, Mark
Curtis, Jason H.
Schelske, Claire L.
机构
[1] Univ Florida, LUECI, Gainesville, FL 32611 USA
关键词
Florida; Organic matter; Sediment chemistry; Shallow lakes; Stable states; PB-210; EUTROPHICATION; ACCUMULATION; INDICATORS; CARBON; RATIOS; STATE;
D O I
10.1007/s10933-010-9472-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
We analyzed Pb-210-dated sediment cores from four relatively shallow lakes (z(max) < 10 m) in the Upper Ocklawaha River Basin, Florida, USA to compare primary producer community structure before and after anthropogenic impacts. We measured physical and chemical sediment variables including density, organic matter (OM), water-soluble phosphorus, polyphosphate (Poly-P), total P (TP), total carbon to total nitrogen mass ratios of OM (TC:TN), biogenic silica (diatoms, sponge spicules), total amorphous silica, and stable carbon and nitrogen isotope ratios of bulk OM. Principal component analysis showed that diatom biogenic silica, TC:TN, Poly-P and TP displayed discernible stratigraphic changes associated with the shift in the primary producer community. We applied k-means cluster analysis to these variables to identify macrophyte-derived, transitional, and phytoplankton-derived sediments. Our approach provides an objective method for identifying sediment sources that may be applied to shallow lakes in other regions. The four study lakes shifted from a macrophyte-dominated state to a transitional state before major anthropogenic disturbances, and became phytoplankton-dominated after similar to 1950.
引用
收藏
页码:1039 / 1052
页数:14
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