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

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

作者： QIN Boqiang, ZHU Guangwei, ZHANG Lu, LUO Liancong, GAO Guang & GU Binhe Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, 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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Invasive non-native plants in China:Role of clonality and geographical origin

Invasive non-native plants in China:Role of clonality and ge...

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北京生物入侵国际研讨会

作者： Dong,Ming~1,Jian Liu~1,and ShiLi Miao~2 1 Key Laboratory of Quantitative Vegetation Ecology,Institute of Botany,Chinese Academy of Sciences, Beijing 100093,China 2 everglades Division,south florida water management district,3301 gun club road,west palm beach,fl 334.6,usa.

＜正＞Biological invasions have become a significant threat to the global environment,since non-native plants have dramatically altered landscapes,substantially reduced biodiversity,and negatively impacted regional ***,to date there is no consensus on invasion mechanisms and predictive *** range from whether we can reliably predict which species

关键词： clonality geographic origin invasive non-native plants

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Air Pollution of Ozone and Its Impacts on Plants and Ecosystems

Air Pollution of Ozone and Its Impacts on Plants and Ecosyst...

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中国生态学学会第六届全国会员代表大会暨学科前沿报告会

作者： GAO Fang Ph.D WUYegang Ph.D florida usa department of Natural Resources and Environmental Control DelawareUSA department of Natural Resources and Environmental Control DelawareUSA everglades Systems Research Division South Florida Water Management District everglades Systems Research Division South Florida Water Management District ESR-SFWMD 3301 gun club road West Palm BeachFL 33406USA ESR-SFWMD 3301 gun club road West Palm BeachFL 33406USA

＜正＞ Ambient air pollution is a serious problem in most developed countries and major developingcountries around the *** other air pollutants,the ground-level ozone（hereafter referredto as ozone for simplicity purpose）is the most prevalent photochemical oxidant and the majorcomponent of *** US Environmental Protection Agency（USEPA）has pointed out that in theUnited States ozone impairs agricultural crops,native vegetation and forests,and ecosystems more

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