NDLI: Impact of high water level fluctuations on stable isotopic signature of POM and source identification in a floodplain lake

Content Provider	Springer Nature Link
Author	Liang, Yue Liu, Xiaozhen Xiao, Huayun Gao, Xiaofei Li, Wenhua Xiong, Jian
Copyright Year	2015
Abstract	In order to recognize impact of water levels on the sources and migration of particulate organic matter in a floodplain lake—Bang Lake (Poyang Lake), suspended particulate matters (SPM), superficial sediment organic matters (SOM) and aquatic plants were collected in and around Bang Lake from June 2012 to May 2013, and their carbon and nitrogen stable isotopic compositions (δ$^{13}$C, δ$^{15}$N) and organic C/N ratio were determined. The results showed that the δ$^{13}$C and δ$^{15}$N values of SPM obviously changed with water levels. In the flowing period, the SPM showed the most negative δ$^{13}$C (−35.4 to −30.8 ‰), δ$^{15}$N (+4.2 to +7.6 ‰) and C/N > 8, suggesting that SPM in the period was mainly derived from $^{13}$C-depleted land C$_{3}$ plants. The highest δ$^{13}$C and C/N ratios of SPM appeared in the flooding period because the lake and river were connected and the soil organic matter and the river-derived SPM were input to the lake. In the lowering period, the relatively lower δ$^{13}$C and δ$^{15}$N values of SPM were almost consistent with those of the decayed aquatic plants, meaning that aquatic plants were the main components of the SPM. In the lentic period, the δ$^{13}$C and C/N ratios of SPM were similar to those of SOM due to the re-suspended SOM in the shallow lake. The SOM in the lentic period (δ$^{13}$C: −30.4 to −25.5 ‰) mainly came from the decline of aquatic plants. With water level rising, the δ$^{13}$C of SOM turned to be higher (−26.1 to 24.3 ‰), while the C/N ratios changed small. It may be the result of that fast water flow scoured and suspended the surface of sediment. The δ$^{13}$C and C/N ratios of aquatic plants changed obviously with water levels, which was mainly due to the seasonal variation of photosynthesis and respiration. The δ$^{15}$N values of aquatic plants were dependent on that of water-soluble N at different water levels. These results indicated that the sources of the organic matter in the lake were obviously influenced by the water levels.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	3
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Impact POM High fluctuations of water level Stable isotope Source Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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