Kissoon La Toya T, Jacob Donna L, Hanson Mark A, Herwig Brian R, Bowe Shane E, Otte Marinus L
Wet Ecosystem Research Group, Department of Biological Sciences, North Dakota State University, NDSU Department 2715, P.O. Box 6050, Fargo, ND 58108-6050, USA.
Minnesota DNR, Wetland Wildlife Population and Research Group, Bemidji, MN, USA.
Wetlands (Wilmington). 2015 Jun;35(3):443-457. doi: 10.1007/s13157-015-0632-8.
We measured concentrations of multiple elements, including rare earth elements, in waters and sediments of 38 shallow lakes of varying turbidity and macrophyte cover in the Prairie Parkland (PP) and Laurentian Mixed Forest (LMF) provinces of Minnesota. PP shallow lakes had higher element concentrations in waters and sediments compared to LMF sites. Redundancy analysis indicated that a combination of site- and watershed-scale features explained a large proportion of among-lake variability in element concentrations in lake water and sediments. Percent woodland cover in watersheds, turbidity, open water area, and macrophyte cover collectively explained 65.2 % of variation in element concentrations in lake waters. Sediment fraction smaller than 63 µm, percent woodland in watersheds, open water area, and sediment organic matter collectively explained 64.2 % of variation in element concentrations in lake sediments. In contrast to earlier work on shallow lakes, our results showed the extent to which multiple elements in shallow lake waters and sediments were influenced by a combination of variables including sediment characteristics, lake morphology, and percent land cover in watersheds. These results are informative because they help illustrate the extent of functional connectivity between shallow lakes and adjacent lands within these lake watersheds.
我们测量了明尼苏达州草原公园（PP）和劳伦森混交林（LMF）省份38个浊度和大型植物覆盖度各异的浅水湖泊水体及沉积物中多种元素的浓度，包括稀土元素。与LMF地区的湖泊相比，PP地区的浅水湖泊水体和沉积物中的元素浓度更高。冗余分析表明，场地和流域尺度特征的组合解释了湖水和沉积物中元素浓度在湖泊间变异的很大一部分。流域内林地覆盖百分比、浊度、开阔水域面积和大型植物覆盖度共同解释了湖水中元素浓度变异的65.2%。小于63微米的沉积物颗粒、流域内林地百分比、开阔水域面积和沉积物有机质共同解释了湖泊沉积物中元素浓度变异的64.2%。与早期关于浅水湖泊的研究不同，我们的结果表明了浅水湖泊水体和沉积物中的多种元素受沉积物特征、湖泊形态以及流域内土地覆盖百分比等多种变量组合影响的程度。这些结果很有意义，因为它们有助于说明这些湖泊流域内浅水湖泊与相邻陆地之间功能连通性的程度。
