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lake regime shift from submerged macrophyte to phytoplankton affected phosphorus speciation in sediment and eutrophic state in caohai lake,Guizhou,China

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Journal of Oceanology and Limnology 2023年第6期41卷 2262-2275页

作者： Jixing DONG Yanmin GUO Pinhua XIA Yuanbin TIAN Feifei ZHENG Anyan LI Tao LIN Ruiwen LI Guizhou Province Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment Guizhou Normal UniversityGuiyang 550001China Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center Yangtze River Basin Ecological Environment Supervision and Administration BureauMinistry of Ecological EnvironmentWuhan 430010China

To understand the effect of regime shift in caohai lake in Yunnan-Guizhou Plateau,SW China from submerged macrophyte dominance to phytoplankton dominance on the specification and distribution of phosphorus and on ecological and environmental states,changes in phosphorus specification in the sediments and water were studied.The form,composition,and distribution of phosphorus in sediment were sampled in July 2020(before regime shift)and July 2021(after regime shift)were analyzed.Results reveal that phosphorus content in sediment was lower than that those of Erhai lake and Dianchi lake,Yunnan,SW China,on the same plateau,and was lower than those of Taihu lake,Chaohu lake,and Poyang lake in the middle-lower Changjiang(Yangtze)River Plain.Organic phosphorus(Or-P)was the main form(up to 60%),followed by inactive phosphorus(Ina-P),and the active phosphorus(Act-P),the least,which is opposite to those of Taihu lake and Poyang lake in the middle-lower Changjiang River Plain in the eastern China.Or-P content was high,indicating a high potential risk of phosphorous release.After the regime shift,the total phosphorus in sediment decreased from 0.87±0.13 to 0.70±0.13 g/kg.The proportion of Or-P and Act-P decreased from 68.23% to 65.32% and from 5.35% to 4.69%,respectively.In contrast,the proportion of Ina-P increased from 26.42% to 29.99%.The Moran’s I index revealed that the heterogeneity of the spatial distributions of the total phosphorus(S-TP)and Act-P in the sediments before regime shift was significant(P0.05).The regime shift aggravated the eutrophication of the lake,the trophic level index(TLI)increased from 48.42 to 54.49(Plake became a mildly eutrophic lake.The results of this study revealed the impact of regime shift in the lake from submerged macrophyte dominance to phytoplankton dominance on the composition and spatial distribution of

关键词： caohai lake sediment phosphorus specification regime shift

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Atmospheric deposition fluxes and health risk assessment of potentially toxic elements in caohai lake(Guizhou Province,China)

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Journal of Mountain Science 2022年第4期19卷 1107-1118页

作者： LIN Shao-xia ZHANG Zhuan-ling XIAO Zhi-qiang LIU Xiao-lan ZHANG Qing-hai State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical UniversityGuiyang 550014China The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Science Guiyang 550014China Guizhou Academy of Testing and Analysis Guiyang 550014China Guizhou University Guiyang 550025China Guizhou Medical University Guiyang 550025China

In this study,the sources of potentially toxic elements(PTEs)from atmospheric deposition in the waters of Guizhou’s caohai lake were investigated in addition to the potential risks to human health.Moss bags were used to enrich PTEs from atmospheric deposition,and eight monitoring sites that best represented geographic variation were established around caohai lake.Moss bags were collected and examined at every 3 months to identify spatiotemporal patterns of dry and wet atmospheric deposition of PTEs.Zn was the most abundant metal identified from deposition in caohai(72.07%–95.94%),followed by Pb and Cd,while Hg was the least abundant(0.008%–0.354%).The contributions of wet deposition of PTEs were greater than those of dry deposition,and deposition during the heating season from December to April was greater than that between April to July.Hg was mainly derived from atmospheric dry deposition(65.38%–84.44%).Spatial distribution analysis indicated that atmospheric deposition was associated with the intensity of human activities and heating emissions.Exposure via hand-to-mouth contact accounted for over 99%of the total exposure risk although overall exposure was lower than threshold acceptable levels for carcinogenic and non-carcinogenic metals,indicating an overall lack of risk towards human health.Nevertheless,the health risk from atmospheric deposition of PTEs in caohai lake may be reduced by focusing on Zn,Pb,and Cd deposition in rainfall and minimizing the hazards associated with hand-to-mouth exposure to PTEs.

关键词： caohai lake Potentially toxic elements(PTEs) Atmospheric deposition Health risk assessment Heavy metals

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Distribution of mercury species in water and sediments in caohai lake, Guizhou Province

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Acta Geochimica 2006年第S1期 153-154页

作者： Xiaoli QIAN1,2, Xinbin FENG1, Xiangyang BI1,3 1 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang 550002, China 2 Guizou University, Guiyang 550025, China 3 Graduate School of the Chinese Academy Sciences, Beijing 100039,China

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