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Experimental study on phosphorus release from sediments of shallow lake in wave flume

Science china Earth Sciences 2006年第z1期49卷 92-101页

作者： sun xiaojing,zhu guangwei, luo liancong & qin boqiang nanjing institute of geography & limnology, Chinese Academy of Sciences, nanjing 2.0008,{4. Graduate School of Chinese Academy of Sciences, Beijing 100039,{4. 1. nanjing institute of geography & limnology Chinese Academy of Sciences Nanjing 210008 China2. Graduate School of Chinese Academy of Sciences Beijing 100039 China

Influence of wave on sediment resuspension and nutrients release from sediments, collected from Lake Taihu and Lake Chaohu, was studied in flume experiments. Under strong-wave conditions, concentrations of suspended solids (SS), total phosphorus (TP) and dissolved total phosphorus (DTP) in overlying water were increased significantly following the sediments re-suspension. During the experiments on sediments of Lake Taihu and Lake Chaohu, TP concentrations increased 6 times and 3 times, and DTP concentration increased 100% and 70% more than it in presuspension, respectively. Concentration of soluble reactive phosphorus (SRP) of experiment on sediment of Lake Taihu increased 25%. During the massive sediment suspension, the dissolved phosphorus in pore water and much of the phosphorus adsorbed by the sediment particles were released into overlying water. The phenomena in this wave flume experiment are quite similar to the situation observed in situ of Lake Taihu. The critical wave stresses of sediment re-suspension are nearly equal. The change of concentrations of SS, TP, and SRP was the same as that in situ *** study showed that concentrations of TP and SRP in lake water could be increased significantly by wave disturbance. Phosphorus release was significantly enhanced by wave disturbance at the beginning of massive sediment re-suspension, but decreased later.

关键词： shallow lakes, wave disturbance, internal release, phosphorus, wave flume experiment.

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Nutrient fluxes induced by disturbance in Meiliang Bay of Lake Taihu

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Science china Earth Sciences 2006年第z1期49卷 186-192页

作者： luo liancong, qin boqiang, {4., sun xiaojing, HONG Dalin, GAO Yajun & XIE Rui {4. institute of geography & limnology, Chinese Academy of Sciences, nanjing 2.0008, china {4. Hydraulic Research institute, Ministry of Water Resources, {4. 210024. china 1. nanjing institute of geography & limnology Chinese Academy of Sciences Nanjing 210008 China2. Nanjing Hydraulic Research Institute Ministry of Water Resources Nanjing 210024 China

A wave flume experiment was conducted to study nutrient fluxes at water-sediment interface of Meiliang Bay under different hydrodynamic conditions. The results reveal that hydrodynamics has remarkable effects on nutrient fluxes in this area. With a bottom wave stress of 0.019 N m-2 (equivalent to disturbance caused by wind SE 5-7 m s-1 at the sediment sample site of Meiliang Bay), the fluxes of TN, TDN and NH4.-N were separately 1.92× 10-3, -1.81 × 10-4.and 5.28× 10-4.mg m-2 s-1(positive for upward and negative for downward), but for TP, TDP and SRP, the fluxes were 5.69 × 10-4. 1.68 × 10-4.and -1.29 × 10-4.mgm-2 s-1. In order to calculate the released amount of nutrients based on these results, statistic analysis on the long-term meteorological data was *** result shows that the maximum lasting time for wind SE 5-7 m s-1 in this area is about 15 h in summer. Further calculation shows that 111 t TN, 32 t NH4.-N, 34.t TP and 10 t TDP can be released into water (the sediment area was 4..4.% of the whole surface area), resulting in concentration increase of 0.025, 0.007, 0.007 and 0.002 mg L-1 separately. With stronger disturbance (bottom wave stress is 0.217 N m-2 which is equivalent to disturbance caused by wind SE 10-11 m s-1 at the same site), there has been significant increase of nutrient fluxes (1.16× 10-2, 6.76×10-3, 1.14. 10-2 and 2.14. 10-3 mgm-2 s-1 for TN, DTN and NH4.-N and TP). The exceptions were TDP with flux having a decrease (measured to be 9.54. 10-5 mgm-2 s-1 ) and SRP with flux having a small increase (measured to be 5.4. × 10-5 mgm-2 s-1). The same statistic analysis on meteorological data reveal that the maximum lasting time for wind SE 10-11 m s-1 is no more than 5 h. Based on the nutrient fluxes and the wind lasting-time, similar calculations were also made suggesting that 232 t TN, 134.9 t TDN, 228 t NH4.-N, 4..7 t TP, 2.0 t TDP and 1.1 t SRP will be released from sediment at this hydrodynamic condition resulting in the concentration

关键词： hydrodynamics disturbance water-sediment interface nutrient release flux Lake Talhu.

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Effect of sediment resuspension on underwater light field in shallow lakes in the middle and lower reaches of the Yangtze River:A case study in Longgan Lake and Taihu Lake

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Science china Earth Sciences 2006年第z1期49卷 114-125页

作者： ZHANG Yunlin, qin boqiang, zhu guangwei, GAO Guang, luo {4. & CHEN Weimin nanjing {4. of geography & limnology, Chinese Academy of Sciences, nanjing 2.0008, china Graduate School of Chinese Academy of Sciences, Beijing 100039, china 1. nanjing institute of geography & limnology Chinese Academy of Sciences Nanjing 210008 China 2. Graduate School of Chinese Academy of Sciences Beijing 100039 China

Based on three continuous in situ underwater light field measurement under different wind waves conditions in Longgan Lake, Meiliang Bay of Taihu Lake in July 2003 and littoral zone near TLLER in July 2004. respectively, the effects of sediment resuspension caused by wind waves on PAR diffuse attenuation, absorption coefficients and euphotic depths are analyzed. In Longgan Lake, PAR diffuse attenuation coefficients during small, middle and large wind waves were 1.74. 2.02 and 2.4. m-1, respectively, and the corresponding PAR spectral diffuse attenuations ranged from 0.98 to 2.97, 1.34.to 3.95 and 1.80 to 5.4. m-1, respectively. In Meiliang Bay, PAR diffuse attenuation coefficients were 2.63, 3.72, 4.37 m-1 during small, middle and large wind waves. PAR diffuse attenuation coefficients increased by 4.% and 66% from small to middle, large wind waves, respectively. Absorption coefficients integrated over the range of PAR of CDOM, phytoplankton were 0.26, 0.28 m-1; 0.76, 0.4. m-1, respectively during middle and large wind waves. Absorption coefficients integrated over the range of PAR of non-algal particulate matter and total suspended particulate matter increased from 0.94.to 1.73 m-1, and from 1.70 to 2.22 m-1, respectively during middle and large wind waves. Relative contributions of absorption coefficients of non-algal particulate matter to total absorption coefficient integrated over the range of PAR were 4..14., 65.05%, respectively, during middle and large wind waves. PAR euphotic depths decreased by 0.4., 0.19, 0.20 m from middle to large wind waves in Longganhu Lake, Meliang Bay and littoral zone near TLLER. Significant correlations were found between transparency, PAR diffuse attenuation coefficients, euphotic depths and total suspended paniculate matter, wind velocity, wave height. Most significant correlations were found between transparency, PAR diffuse attenuation coefficients, euphotic depths and inorganic suspended paniculate matter but low correlations

关键词： shallow lake, Taihu Lake, diffuse attenuation coefficient, absorption coefficient, total suspended particulate matter.

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Estimation of internal nutrient release in large shallow Lake Taihu, china

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Science china Earth Sciences 2006年第z1期49卷 38-50页

作者： qin boqiang, zhu guangwei, ZHANG Lu, luo {4., GAO Guang & GU Binhe nanjing {4. of geography & limnology, Chinese Academy of Sciences, nanjing 2.0008, china Everglades Department, South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL 334.6, USA Chinese Acad Sci Nanjing Inst Geog & Limnol Nanjing 210008 Peoples R China S Florida Water Management Dist Everglades Dept W Palm Beach FL 33406 USA

Based on field investigation of wave, sediment suspension and the changes in nutrient concentration of the water column in Lake Taihu, china, we proposed two release models to quantify nutrient release under static and dynamic conditions, respectively. Under static conditions, nutrient release from sediments to the overlying water mainly depends on chemical diffusion induced by concentration gradient, in which the nutrient release is controlled by the temperature, dissolved oxygen concentration in the sediment-water interface, oxidation-reduction potential and the concentration difference between porewater and overlying water. Under dynamic condition (or disturbed condition),both dissolved and particulate nutrients in sediments are released into the water column because of wind-induced sediment suspension. The amount of nutrient release under dynamic conditions is larger than that under the static condition. The release of dissolved nutrients, however, does not increase because the wind induced turbulence made oxidation of metallic elements such as Fe (ferric iron), Mn which are capable of precipitating soluble reactive phosphate (SRP). Under dynamic conditions, therefore, the release of total phosphorus (TP) increases dramatically but the release of SRP is close to those under static conditions. In sediments of Lake Taihu, high Fe content leads to a high ratio of Fe to P contents in sediments (Fe:P ratio). Under dynamic conditions, therefore, nutrient release is controlled by the intensity of disturbance, sediment consolidation and nutrient content in *** for dissolved nutrients, especially SRP, the release is also controlled by the intensity of dynamic re-oxidation, Fe content in sediments and nutrient concentration gradient between porewater and overlying water. Based on these two release modes, the release flux in Lake Taihu has been estimated. In the static condition (i.e. laboratory experimental condition), total release of NH4.-N for whole lake is ca

关键词： shallow lake, eutrophication, internal loading, sediment, nutrient, dynamic turbulence.

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Wind-wave affected phosphate loading variations and their relationship to redox condition in Lake Taihu

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Science china Earth Sciences 2006年第z1期49卷 154-161页

作者： ZHANG Lu zhu guangwei luo liancong GAO Guang ZHANG Yunlin qin {4. FAN Chengxin nanjing institute of geography&limnology Chinese Academy of SciencesNanjing 210008China

Variation of wind speed and the physico-chemical parameters,such as dissolved phosphate,ferrous and manganese in lake water were observed on *** with the chemistry analysis and simulated experiment in lab,the change of phosphate concentration in lake water was *** variation of ferrous/phosphate ratio explained that along with the enhancement of wind-wave effect and the oxidation ability of lake water,the effects of co-precipitation and removal of dissolved phosphate and iron in the lake water were *** ferrous/phosphate ratio in pore water was less than 2.0,demonstrating that the dissolved phosphate can be released into the overlying ***,in the lake water,the stability of phosphate was controlled by the water *** phosphate release experiment showed that molecular release was only part of the whole and the direct discharge of phosphate in the pore water was also a *** mineralization and biological process of suspended particulates in the water may be another important reason for the whole phosphate loadings.

关键词： phosphate internal release redox condition ferrous/phosphate ratio Lake Taihu.

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SEDIMENT PROPERTIES AND DYNAMICS IN THE TAIHU LAKE,china

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International Journal of Sediment Research 2006年第4期21卷 312-320页

作者： liancong luo1, boqiang qin2, Guang GAO3, {4. zhu4. and Jinshan ZHANG51 Assis. Prof., 2,3Prof.,4.Assoc. Prof., nanjing {4. of geography and limnology, CAS, nanjing 2.0008, china 5 Prof., nanjing {4. of Hydrological Sciences, Ministry of Water Resources, nanjing 210024. china nanjing institute of geography and limnology CASNanjing 210008China nanjing institute of Hydrological Sciences Ministry of Water ResourcesNanjing 210024China

Time-series measurements of wave, current and suspended sediment concentration (SSC) weremade at three sites (Sites 1-3) and sediment samples were collected at different locations (Sites 4.7)in Lake Taihu. The significant wave height, length and period during the observation were 0.155 m,3.4. m and 1.9 s and the mean current speed was 0.08 m/s. The size distribution results show thatthe sediment is well sorted, coarse-skewed and very leptokurtic in the upper 10 cm and clay andfine silt can account for more than 70 % of the total within this depth. The median size remainsconstant vertically in the top 10 cm in the eastern, southern, and northern areas of the lake, butchanges significantly in the eastern area resulting from the short retention time of water in this *** realistic settling velocity of suspended particles varies in the range of 0.01~0.05 cm s-1 andthey sink in a flocculated form rather than individually. Based on a simple mass flux model, thesediment erosion rate was estimated to range between 10-7 and 10-5 kg/m2.s. The results in thisstudy can be a great contribution to the development of a sediment transportation model in LakeTaihu.

关键词： Sediment Resuspension Erosion rate Settling velocity Lake Taihu

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Status of aquatic organisms resources and their environments in Yangtze River system(2017-2021)⋆

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Aquaculture and Fisheries 2024年第5期9卷 833-850页

作者： Haile Yang Li Shen Yongfeng He Huiwu Tian Lei Gao Jinming Wu Zhigang Mei Nian Wei Lin Wang Tingbing zhu Feifei Hu Jinling Gong Hongchun Du Xinbin Duan Huatang Deng Daoqun Wang Fengyue zhu Yunfeng Li Fan Wu Huijun Ru Yan Zhang Junyi Li Junlin Yang Yuntao Zhou Dongdong Fang Yinping Wang Danqing Lin Yanping Yang Peijie Li Silei Liu Jian Yang Ping zhuang Sikai Wang Tao Zhang Gang Yang Wenbo Yang Lilai Yuan Kun Cao Shuo Xu Huiyuan Liu Zhiqiang Liang Chongrui Wang Hong Li Xiping Yuan Xin Yang Yilong Fu Yanping Zhang Haixin Zhang Zhiying Tao Sheng Wang Xiaoping Gao Binsong Jin Kemao Li Guojie Wang Shenglong Jian Yingqin Li Chenjiang Xue Chunyun Lei Shaowei Xue Yi sun Bin zhu Ke Shao Xingkun Hu Meihua Xiong Jun Du Bin He Tao Yan Yingying Huang Yuanchao Zou Biwen Xie Yongming Wang Bin Li Fei Liu Yaoyao Zhang Fei Fan Zhijian Wang Jing Huang Haoran Gu Hailong Ge Yan Dan Yan Li Shuqiao Wang Chuang Zhang Lu Zhou Xue Wang Sheng Zeng Yan Xiang Xugang He Jianhui qin Chengxing Xia Jie Hou Yifu Shi Lifang Gao Zhiqiang zhu Hongbao Shen Yun Du Xuejun Duan Jiawu Xiong Deguo Yang Shaoping Liu Zhaohui Ni Hui Zhang Kai Liu Feng Zhao Yingren Li Jianwei Wang Qiwei Wei Yangtze River Fisheries Research institute Chinese Academy of Fishery SciencesWuhan430223China institute of Hydrobiology Chinese Academy of SciencesWuhan430072China Fishery Resource and Environment Research Center Chinese Academy of Fishery SciencesBeijing100141China Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization Ministry of Agriculture and Rural AffairsFreshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi214081China East china Sea Fisheries Research institute Chinese Academy of Fishery SciencesShanghai200090China institute of Fisheries Engineering Chinese Academy of Fishery SciencesBeijing100141China Hunan Fisheries Science institute Changsha410153China Jiangxi Fisheries Research institute Nanchang330039China Jiujiang Academy of Fishery Sciences Jiujiang332000China School of Life Sciences Nanchang UniversityNanchang330031China qinghai Provincial Fishery Technology Extension Center Xining810012China Yunnan Academy of Fishery Sciences Kunming650111China institute of Hydroecology Ministry of Water Resources and Chinese Academy of SciencesWuhan430079China Fisheries institute Sichuan Academy of Agricultural SciencesChengdu611731China School of Life Sciences Neijiang Normal UniversityNeijiang641100China School of Life Sciences Southwest UniversityChongqing400715China Chongqing Fishery Sciences Research institute Chongqing401120China Guizhou Fisheries Research institute Guiyang550025China College of Fisheries Huazhong Agricultural UniversityWuhan430072China Hubei Fisheries Science Research institute Wuhan430070China Shaanxi Fisheries Research institute Xi’an710086China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan430077China nanjing institute of geography and limnology Chinese Academy of SciencesNanjing210008China Central South Inventory and Planning institute of State Forestry and Grassland Administration Changsha410014China

The Yangtze River is the mother river of *** promote the aquatic ecosystem protection of the great river,the Project of Yangtze Fisheries Resources and Environment Investigation(2017-2021)supported by the Ministry of Agriculture and Rural Affairs,*** carried out by 24.institutes and universities that located in the Yangtze River basin surveys the status of(1)fish species composition and spatial distribution,(2)current fish abundance,(3)endangered fishes,(4.Yangtze finless porpoise,(5)aquatic eco-environments,(6)water-level fluctuation areas,(7)capture fisheries and recreational fisheries of the Yangtze River mainstream and 10 of its main tributaries,including Yalong River,Heng River,Min River(including Dadu River),Chishui River,Tuo River,Jialing River,Wu River,Han River,Dongting Lake and Poyang *** results showed that there were 4.3 fish species(belonging to 163 genus,37 families,and 18 orders)before 2017,but only 323 fish species(including 15 new recorded exotic species)were recorded in the project of *** them,Cyprinus carpio,Carassius auratus,Hypophthalmichthys molitrix,Pelteobagrus fulvidraco,Coilia brachygnathus,Silurus asotus,Saurogobio dabryi,Ctenopharyngodon idellus,Pelteobagrus nitidus,Hemiculter leucisculus,Siniperca chuatsi,Coreius heterodon,Culter alburnus,Parabramis pekinensis,and Aristichthys nobilis were the dominant species across the whole Yangtze River *** is estimated that there were 886 million individuals weighing 124.8 million kg,merely equivalent to 27.3%of the resources in 1950s,30.9%of the resources in 1960s,or 58.7%of the resources in *** the new list of protected fishes that recorded in the Yangtze River system,only 15 of 29 were collected in this project of *** gladius has been affirmed to be Extinct by International Union for Conservation of Nature(IUCN).The wild individuals of Tenualosa reevesii and Luciobrama macrocephalus have disappeared for many years and maybe have been extinct

关键词： Fishes Yangtze finless porpoise Resources Aquatic ecosystem Fisheries Background investigation Yangtze river system

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利用陆基高光谱遥感捕捉太湖蓝藻水华日内快速变化过程

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湖泊科学 2021年第6期33卷 1951-1960页

作者：张运林张毅博李娜孙晓王玮佳秦伯强朱广伟中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室南京210008 中国科学院大学北京100049 南京中科深瞳科技研究院有限公司南京210031

受蓝藻自身垂直迁移和频繁风浪扰动影响,太湖蓝藻水华漂浮混合和迁移堆积等变化迅速,在传统的湖面定位和断面监测中总感觉蓝藻水华有些“来无影、去无踪”,限制了对其形成过程、驱动机制和防控治理的深入认识.卫星遥感可以实现蓝藻水华... 详细信息

受蓝藻自身垂直迁移和频繁风浪扰动影响,太湖蓝藻水华漂浮混合和迁移堆积等变化迅速,在传统的湖面定位和断面监测中总感觉蓝藻水华有些“来无影、去无踪”,限制了对其形成过程、驱动机制和防控治理的深入认识.卫星遥感可以实现蓝藻水华空间分布同步观测,但由于观测频次的限制很难捕捉蓝藻水华快速动态变化过程.本文利用与杭州海康威视数字技术股份有限公司联合自主研发的陆基(地基、岸基或者平台、船舶、桩基等能固定安装的均可)高光谱多参数水质遥感监测仪,架设于中国科学院太湖湖泊生态系统研究站(简称太湖站)水上观测场,通过对叶绿素a浓度及其他关键水质参数秒分钟级的连续观测,有效捕捉了一天内蓝藻水华短期突然和快速变化过程.研究结果显示,在微风和小风条件下蓝藻容易在表层水体漂浮,盛行西北风驱动湖面开敞水域蓝藻水华快速漂浮集聚到太湖站岸边,短短半小时内表层水体叶绿素a浓度可以由10μg/L快速攀升到100μg/L以上,一天内会出现多个叶绿素a峰值,清晰展示了蓝藻快速日内动态变化过程.受蓝藻快速日内变化影响,透明度、总氮、总磷和高锰酸盐指数等水质参数也呈现出快速日内变化,叶绿素a浓度与透明度存在极显著负相关,与总氮、总磷和高锰酸盐指数存在极显著正相关,叶绿素a能解释总氮、总磷80%以上的变化,说明蓝藻短期内的漂浮和集聚深刻影响到湖泊水质.

关键词：陆基高光谱遥感蓝藻水华叶绿素a 湖泊水质太湖

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Two Ultraviolet Radiation Datasets that Cover china

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Advances in Atmospheric Sciences 2017年第7期34卷 805-815页

作者： Hui LIU Bo HU Yuesi WANG Guangren LIU Liqin TANG Dongsheng JI Yongfei BAI Weikai BAO Xin CHEN Yunming CHEN Weixin DING Xiaozeng HAN Fei HE Hui HUANG Zhenying HUANG Xinrong LI Yan LI Wenzhao LIU Luxiang LIN zhu OUYANG boqiang qin Weijun SHEN Yanjun SHEN Hongxin SU Changchun SONG Bo {4. Song {4. Anzhi WANG Genxu WANG Huimin WANG Silong WANG Youshao WANG Wenxue WEI Ping XIE Zongqiang XIE Xiaoyuan YAN Fanjiang ZENG Fawei ZHANG Yangjian ZHANG Yiping ZHANG Chengyi ZHAO Wenzhi ZHAO Xueyong ZHAO Guoyi ZHOU Bo zhu State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Key Laboratory for Semi-Arid Climate Change Ministry of Education College of Atmospheric SciencesLanzhou University College of Atmospheric Sciences Chengdu University of Information Technology the institute of Botany Chinese Academy of Sciences Chengdu institute of Biology Chinese Academy of Sciences the institute of Applied Ecology Chinese Academy of Sciences the institute of Soil and Water Conservation Chinese Academy of Sciences the institute of Soil Science Chinese Academy of Sciences the Northeast institute of geography and Agroecology Chinese Academy of Sciences the institute of Subtropical Agriculture Chinese Academy of Sciences the South china Sea institute of Oceanology Chinese Academy of Sciences the Cold and Arid Regions Environmental and Engineering Research institute Chinese Academy of Sciences Xinjiang institute of Ecology and geography Chinese Academy of Sciences Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences the institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences the nanjing institute of geography and limnology Chinese Academy of Sciences the South china Botanical Garden Chinese Academy of Sciences the institute of Genetics and Developmental Biology Chinese Academy of Sciences the institute of Oceanology Chinese Academy of Sciences the institute of Mountain Hazards and Environment Chinese Academy of Sciences the institute of Hydrobiology Chinese Academy of Sciences the Northwest institute of Plateau Biology Chinese Academy of Sciences

Ultraviolet（UV） radiation has significant effects on ecosystems, environments, and human health, as well as atmospheric processes and climate change. Two ultraviolet radiation datasets are described in this paper. One contains hourly observations of UV radiation measured at 4. Chinese Ecosystem Research Network stations from 2005 to 2015. CUV3 broadband radiometers were used to observe the UV radiation, with an accuracy of 5%, which meets the World Meteorology Organization＇s measurement standards. The extremum method was used to control the quality of the measured datasets. The other dataset contains daily cumulative UV radiation estimates that were calculated using an all-sky estimation model combined with a hybrid model. The reconstructed daily UV radiation data span from 1961 to 2014. The mean absolute bias error and root-mean-square error are smaller than 30% at most stations, and most of the mean bias error values are negative, which indicates underestimation of the UV radiation intensity. These datasets can improve our basic knowledge of the spatial and temporal variations in UV radiation. Additionally, these datasets can be used in studies of potential ozone formation and atmospheric oxidation, as well as simulations of ecological processes.

关键词： reconstructed ozone absolute ultraviolet estimates environments climatic cumulative sunshine meteorological

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