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Patterns and trajectories of macrophyte change in East China’s shallow lakes over the past one century

Science China Earth Sciences 2021年第10期64卷 1735-1745页

作者： Feifan HUANG Ke ZHANG Shixin HUANG Qi LIN State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China

Macrophytes play important roles in maintaining ecosystem health and stability of shallow *** understanding of their long-term dynamics has important theoretical and practical significance for both lake ecosystem restoration and eutrophication ***,the knowledge about the historical status and changing patterns of macrophytes in China’s shallow lakes is still controversial and lacks systematic ***,we reviewed and synthesized the published records of submerged macrophytes from 14 typical shallow lakes in the eastern plain covering the past 100 *** results suggest that submerged macrophytes have experienced three clear stages of change:rare period(the 1900s–the 1950s),growth period(the 1950s–the 1980s),and recession period(the 1980s–now).This finding is different from the traditional understanding that submerged macrophytes were abundant in the early 20th century and have been degrading since *** this basis,we proposed the possible evolution pattern(less-more-less)of submerged macrophytes in the eastern plain lake region over the past 100 years,which provides new perspectives about the long-term evolution process of macrophytes in shallow ***,we found that the decline of submerged macrophytes during the regime shift shows a gradual process at the interdecadal scale;this finding contradicts the classical regime shift theory that macrophytes decline sharply during the critical *** study has important theoretical value for the restoration of the eastern plain lakes in China from“turbid lake”to“clear lake”,especially for establishing the historical reference condition and restoration path of macrophytes.

关键词： Macrophyte Submerged macrophyte Eutrophication shallow lakes Regime shift Climate change

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Relationship Between Surface Sediment Diatoms and Summer Water Quality in shallow lakes of the Middle and Lower Reaches of the Yangtze River

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Journal of Integrative Plant Biology 2005年第2期47卷 153-164页

作者： Xiang-DongYANG Xu-HuiDONG GuangGAO Hong-XiPAN Jing-LuWU NanjingInstituteofGeographyandLimnology theChineseAcademyofSciencesNanjing210008China

The relationship between surface sediment diatoms and summer water quality was investigated at 49 lakes in the middle and lower reaches of the Yangtze River. lakes ranging from oligomesotrophic to hypereutrophic were examined, providing an obvious nutrient gradient. With the shift from mesotrophic to eutrophic levels, diatom multi-ecotypes dominated by epiphytic and facultative planktonic taxa were replaced by nutrient-tolerant planktonic taxa, such as Cyclotella meneghiniana Skvortzow, C. atomus Hustedt,Cyclostephanos Round, and Stephanodiscus Ehrenberg etc., reflecting the nutrient changes in the *** relationship between diatoms and summer water quality indices was explored further using numeric analysis. Canonical correspondence analysis (CCA) with forward selection and a Monte Carlo permutation test revealed that of all 25 summer water environmental variables, total phosphorus (TP), chlorophyll a (Chzl a), Secchi depth (SD), dissolved inorganic phosphorus, C1-, SO42-, Mg2+, CO32-, and water depth were significant variables (P＜0.05) in explaining diatom distributions. Of these, TP, Chl a, SD, and C1-, were the most important variables. The result of the correlation analysis also showed that a significant correlation exists among these variables, implying that these indices are either interconnected or independent in explaining the diatom data. For phosphorus-limited sites, TP was the most significant variable affecting the diatoms, also affecting changes in Chl a, SD, and iron concentrations. The independence of Chl a may be related to algal competition induced by lake eutrophication, resulting in the feedback to diatom *** addition to TP, SD can be related to sediment disturbance by wave action and the growth of macrophytes in large shallow lakes. These relationships between diatom ecotypes and water quality provide the basis for a future quantitative reconstruction of historic lake nutrient evolution in the study area and will also provide a wealt

关键词： canonical correspondence analysis (CCA) diatoms middle and lower reaches of the Yangtze River shallow lakes water quality

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Geochemical Forms of Phosphorus in Sediments of Three Large, shallow lakes of China

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Pedosphere 2006年第6期16卷 726-734页

作者： ZHU Guang-Wei QIN Bo-Qiang ZHANG Lu LUO Lian-Cong Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China

A sequential extraction method for the fractionation of phosphorus （P） in lake sediments was used to analyze phos- phorus fractions of sediments taken from three large, shallow. eutrophic freshwater lakes of China-Talhu Lake. Chaohu Lake, and *** Lake. All three lakes are located in the lower reaches of the Changjiang River （Yangtze River）. In Taihu Lake and Chaohu Lake, algae blooms occurred every year, while Longgan Lake was a macrophyte-dominated lake. Results showed that exchangeable phosphorus fractions were much higher in the eutrophic lake sediments than in the macrophyte-flourishing lake sediment. Also, the ratio of Fe：P in the sediments of the algae-predomlnant lakes was generally much lower than that in the macrophyte-predominant lakes. Thus, the geochemical fractions of phosphorus in sediments had a closer relationship with the type of aquatic vegetation.

关键词： algal bloom macrophyte phosphorus sediment shallow lakes

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Response of rotifer community to environmental changes in five shallow lakes in the middle reach of Changjiang River, China

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Chinese Journal of Oceanology and Limnology 2014年第5期32卷 1083-1091页

作者：都雪冯伟松李为叶少文刘家寿张堂林李钟杰 State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences University of Chinese Academy of Sciences

We evaluated the response of a rotifer community to environmental changes in five shallow lakes in the middle reach of the Changjiang （Yangtze） River in summer and autumn 2010. These five lakes differed in trophic status and rotifer community structure. Twenty-nine rotifer species were collected, of which Keratella cochlearis, Polyarthra dolichoptera, and Trichocerca elongate were dominant. The mean density, Shannon-Wiener diversity, and equitability among the five lakes differed significantly （P〈0.05）. The mean rotifer density was positively correlated with trophic state. The diversity was higher in lakes with high macrophyte coverage. The composition of rotifer species was closely associated with the trophic gradient. Five environmental variables, Secchi depth, conductivity, TN, NHa-N, and TP, significantly affected the composition of rotifer species. Keratella quadrata, Brachionus calyciflorus, and B. forficula were more common in eutrophic conditions. Our results suggest that eutrophication has a significant influence on the rotifer community structure and highlight the potential for using rotifer community structure as an indicator of trophic status in subtropical lakes.

关键词： rotifer environmental variables shallow lakes eutrophication

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Heavy-metal contents in suspended solids of Meiliang Bay,Taihu Lake and its environmental significances

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Journal of Environmental Sciences 2005年第4期17卷 672-675页

作者： ZHUGuang-wei CHIQiao-qiao QINBo-qiang WANGWen-min NanjingInstituteofGeographyandLimnology ChineseAcademyofSciencesNanjing210008China JiangxiAgriculturalUniversity Nanchang330045China NanjingInstituteofGeographyandLimnology ChineseAcademyofSciencesNanjing210008China／／GraduateChina SchoolofChineseAcademyofSciences Beijing100039

Surface water was taken from river mouth to the central area of Meiliang Bay, Taihu Lake, a large shallow eutrophic lake in China. Suspended solids were condensed by centrifugation 25 L surface water samples from each selected site. Suspended solids and surface sediments were further freeze-dried and microwave digested before determining the metals by ICP-AES. Among the metals analyzed in suspended solids and sediments, contents of Cr, Cu, Mn, Ni, and Zn in suspended solids were significantly higher than those in sediments while contents of Al, Ba, Be, Ca, Co, Fe, K, Mg, Pb, and V in suspended solids were 10%—30% higher than those in sediments. Sr and Ti contents in suspended solids and sediments were very similar. Na content in suspended solids was lower than that in sediments. Heavy metals were significantly accumulated in suspended solids. From the river mouth to the center of Meiliang Bay, contents of Cr, Cu, Pb, and Zn in suspended solids showed a gradual decreasing trend indicating the river(Zhihugang River) still discharged large quantity of heavy metals to Meiliang Bay. The study suggests that the geochemical behaviors and ecological effects of heavy metals in suspended solids may serve as a good indicator for the pollution of lake.

关键词： shallow lakes suspended solids heavy metals Taihu Lake

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Phosphorus forms and bioavailability of lake sediments in the middle and lower reaches of Yangtze River

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Science China Earth Sciences 2006年第z1期49卷 28-37页

作者： ZHU Guangwei QIN Boqiang ZHANG Lu Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China

Forms of phosphorus in sediments from 25 lakes in the middle and lower reaches of Yangtze River were analyzed by the sequential extraction procedure. Contents and spatial distrubution of algal available phosphorus (AAP) in sediments of Lake Taihu, the third largest freshwater lake of China, were also studied. Relationships between phosphorus forms in sediment and macrophytes coverage in sample sites, as well as phosphorus forms in sediments and chlorophyal contents in lake water were discussed. Exchangeable form of phosphorus (Ex-P) in surface sediments was significantly positive correlative to total phosphorus (IP), dissolved total phosphorus (DTP) and soluble reactive phosphorus (SRP) contents in the lake water. Bioavailable phosphorus (Bio-P) contents in sediments from macrophytes dominant sites were significantly lower than that in no macrophyte sites. In Lake Taihu, Ex-P content in top 3 cm sediment was highest. However, content of ferric fraction phosphorus (Fe-P) was highest in 4 - 10 cm. Bioavalilble phosphorus (Bio-P) contents in surface sediments positively correlated to Chlorophyll a contents in water of Lake Taihu with significant difference. Therefore, contents of Bio-P and AAP could be acted as the indicators of risks of internal release of phosphorus in the shallow lakes. It was estimated that there were 268.6 ton AAP in top 1 cm sediments in Lake Taihu. Sediment suspension caused by strong wind-induced wave disturbance could carry plenty of AAP into water in large shallow lakes like Lake Taihu.

关键词： shallow lakes sediments phosphorus geochemical forms bioavallabillty eutrophicatlon hydrodynamics.

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The effects of water depth on the growth and reproduction of Potamogeton crispus in an in situ experiment

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Journal of Plant Ecology 2017年第3期10卷 546-558页

作者： Nannan Zhou Weiping Hu Jiancai Deng Jinge Zhu Weiwei Xu Xin Liu State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of Sciences73 East Beijing RoadNanjing 210008JiangsuChina College of Environmental Science and Engineering Anhui Normal University189 South Jiuhua RoadWuhu 241000AnhuiChina University of the Chinese Academy of Sciences 19 Yuquan RoadBeijing 100049China

Aims Water level is one of the most important determinants of the distri-bution and composition of submersed aquatic vegetation in shal-low *** changes in nutrient loading,large-scale declines in submerged macrophytes in shallow lakes are largely attributed to strong external or internal forces,including changes in water *** a winter-active submerged macrophyte,Potamogeton crispus has important functions in aquatic *** objec-tives of our study were to reveal the effects of water depths on the germination,growth,reproduction and morphological changes of *** under natural environmental conditions;identify the optimum water depth range for colonization of ***;and pre-dict the succession course for *** in Lake *** A long-term in situ experiment was performed to study the effects of water depth on the growth and morphology of *** across the entire life *** were grown in the improved cross type of rhizotrons for 30 weeks at three different water depths(60,120 and 200 cm)in Dongtaihu Bay of Lake *** measured the plant height,root length,the length and width of leaves and counted the numbers of leaves,ramets,turion spikes and roots of each plant on each observation day during the *** Findings Water depths ranging from 60 to 120 cm were favourable for above-ground vegetation growth,root tissue growth and the reproductive ability of *** water depth of 200 cm or beyond,the distri-bution of *** will be limited in the following year because of the lack of turion formation and the severe inhibition of ramet *** relationship between above-ground biomass and growth time at three different water depths fits a logistic growth curve well(P<0.001).The rapid growth and distribution with high density of *** at water depth near 60 cm during the reproductive stage is not favourable for growth of other submerged *** a continuous water depth of~60-120 cm is the op

关键词： influence strength morphology responses rhizotron shallow lakes submerged plant

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The role of lake heat flux in the growth and melting of ice

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Advances in Polar Science 2021年第4期32卷 364-373页

作者： Bin CHENG XIE Fei LU Peng HUO Puzhen Matti LEPPÄRANTA Finnish Meteorological Institute Helsinki Fi-00101Finland State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116081China University of Helsinki Helsinki Fi-00014Finland

For shallow lakes,ice mass balance is largely dominated by thermodynamic *** heat flux from lake water plays a critical role for ice growth and *** this study,we applied a numerical thermodynamic lake model to investigate the sensitivity of the lake ice mass balance to the lake heat flux during the growth and melting *** groups of modelling experiments forced by simplified climatological weather data have been carried *** sites,Lake Wuliangsuhai inInner Mongolia,China’s arid region and Lake Orajärvi in snowy Finnish Lapland,were *** heat flux affects inversely proportional maximum ice thickness followed by ice break-up *** solar radiation and surface albedo complicate the effect of lake heat flux on lake ice mass balance during melting *** heavy snowfall,the increase of lake heat flux adds on the formation of granular ice but reduces the formation of columnar *** climatological weather conditions,theice cover winter seasonal mean lake heat flux were 14 W·m^(−2) and 4 W·m^(−2) in Lake Wuliangsuhai and Lake Orajärvi,respectively.

关键词： shallow lakes lake ice heat flux numerical modelling

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