期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 610, 期 -, 页码 101-110出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.07.243
关键词
Sediment internal P management; Geoengineering materials; Suspended particulate matter; P flux; Benthic macroinvertebrate community
资金
- National Natural Science Foundation of China [51579233, 41371479]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of People's Republic of China [2015BAD13B06]
- Jiangsu Social Development Program [BE2016811]
Clay-based phosphorus (P) sorbents have been increasingly used as geoengineering materials for the management sediment-derived internal P loading in eutrophic lakes. However, the long-term behavior of these sorbents has remained elusive along with their response to burial under suspended particulate matter (SPM), and their effect onmacroinvertebrate communities occupying dynamic regions at the sediment-water interface of shallow and turbid lakes. In this study, fieldmesocosmexperiments were undertaken in Lake Chaohu, China, to study the effects of the application of lanthanum-modified bentonite (LMB) and thermally-modified calcium-rich attapulgite (TCAP) on sediment internal P loading and to assess their influence onmacroinvertebrate community structure. A complementary laboratory core incubation study was also undertaken to investigate the effects of SPM deposition on LMB and TCAP performance. In the field, both LMB and TCAP effectively intercepted P released from sediment for up to five months. A P fractionation analysis indicated that LMB and TCAP application results in a substantial increase in inert P fractions in sediment. Laboratory studies indicated that deposition of SPM may increase in mobile P both in the upper sediment and across the new post-SPM deposition sediment-water interface. Importantly, a comparison of sediment chemical extractions and estimated P fluxes suggests that chemically-defined forms of P in the sediment may be used as a proxy to estimate the net sediment P flux. Significantly, the surficial application of either LMB or TCAP did not cause negative effects on macroinvertebrate communities. This study indicates that to sustain a low P flux across the sediment-water interface in shallow, turbid lakes, repeat dosing of geoengineering materials, temporally aligned to the deposition of fluvial SPM, may be required. (C) 2017 Elsevier B.V. All rights reserved.
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