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首页> 外文会议>International Conference on Environmental Science and Technology >NATURAL RADIONUCLIDE DATING FOR CALCULATION OF SEDIMENT ACCUMULATION IN WETLAND SEDIMENTS
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NATURAL RADIONUCLIDE DATING FOR CALCULATION OF SEDIMENT ACCUMULATION IN WETLAND SEDIMENTS

机译：湿地沉积物沉积物积累计算的天然放射性核素约会

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Wetlands are one of the most important ecosystems with natural functions and economic values. Wetlands act as regulators of water regimes, behaving like a sponge that absorbs excess water and enhances the water quality. Another function of wetlands is providing natural diversity. Nowadays, wetlands, frequently defined as swamps or marshes, have great importance in terms of their functions and as habitats for a wide variety of organisms.The depth-dependent temporal distribution of element concentrations in wetland sediments is a very valuable source for determining distributions of elements in water, together with the flux and rate of accumulation, to obtain the chronology of natural and human-induced events in the ecosystem and their impacts. Nuclear techniques used in this study have improved in the last forty years. In sedimentation studies radiometric dating techniques are used to calculate the sediment accumulation rate.In this study, sediment accumulation rate calculated up to 40 cm below surface from the San Joaquin River National Wildlife Refuge (SJRNWR) which receives seasonal agricultural drainage from irrigated cropland has been investigated. Sedimentation rates in wetland sediment cores were measured with the ~(210)Pb technique and sediment accumulation rates were determined in each sediment layers. ~(210)Pb determinations were done via gamma spectrometric measurements. Profile distributions of ~(210)Pb were calculated by using CRS (Constant Rate of Supply) mathematical models in sedimentation rate calculations.
机译：湿地是具有自然功能和经济价值的最重要的生态系统之一。湿地作为水资源监管机构，表现得像一个海绵吸收过量的水，增强水质。湿地的另一个功能正在提供自然多样性。如今，湿地，经常被定义为沼泽或沼泽，就其功能和各种各样的生物的栖息地具有重要意义。湿地沉积物中元浓度的深度依赖性时间分布是确定分布的非常有价值的源水中的元素与积分的助焊剂和累积率，以获得生态系统中的自然和人类诱导的事件的年表及其影响。在过去的四十年中，本研究中使用的核技术有所改善。在沉淀研究中，辐射测定技术用于计算沉积物积累率。本研究中，从San Jaaquin河国家野生动物避难所（SJRNWR）下面计算的沉积物积累率高达40厘米，从灌溉农田接受季节性农业排水调查。用〜（210）Pb技术测量湿地沉积物芯中的沉降速率，在每个沉积物层中测定沉积物积累速率。 〜（210）Pb测定通过伽马光谱测量测量完成。通过使用CRS（恒定的供应率）数学模型来计算〜（210）Pb的轮廓分布。

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