Impact of environmental variables on spatial and seasonal internal phosphorus loading in a mesoeutrophic lake

作     者：Katarzyna Kowalczewska-Madura Ryszard Go?dyn Julia Bogucka Katarzyna Strzelczyk 

作者机构：Department of Water ProtectionFaculty of BiologyAdam Mickiewicz University 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2019年第34卷第1期

页      面：14-26页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：supported by the Fund for the statutory activities of the Department of Water Protection 

主　　题：Bottom sediments Interstitial water Bottom water Internal loading Sediment-water interface 

摘      要：Strzeszynskie Lake was formerly a slightly eutrophic（meso-eutrophic） water body. The aim of the current research was to define variables on both spatial and seasonal internal phosphorus loading from bottom sediments at five stations located in zones varying in depth, oxygenation, macrophyte presence,and uses of the neighboring catchment area. Ex situ experiments done with the use of intact bottom sediment cores have shown that the highest phosphorus release occurred in the deepest part of the lake and reached 3.6 mg P/m2d under anoxic conditions during summer thermal stratification. In turn, the internal loading from littoral sediments, which were well aerated all year round, was clearly ***, phosphorus accumulation in the bottom sediment was observed to reach a maximum of 1.45 mg P/m2d in autumn. A comparison of the internal loading intensity in lake zones with different land uses of the neighboring catchment area has shown slightly higher values at stations adjacent to the forest catchment area than those used for recreation. Changes in the land use of the catchment area of Strzeszynskie Lake, especially the increase in impermeable surfaces, have led to an increased inflow of external loads after heavy rains, resulting in deterioration in water quality and a delayed increase in internal loading.