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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >A significant shift in particulate organic matter characteristics during flooding of River Krishna, eastern peninsular India
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A significant shift in particulate organic matter characteristics during flooding of River Krishna, eastern peninsular India

机译：河克里希纳河洪水淹水中的微粒有机质特征的显着变化

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摘要

Extremely heavy rainfall over a small, semi-arid section of the Indian Peninsula in October 2009, together with release of water from dams resulted in very severe flooding in River Krishna. The sources and type of organic matter during and after the floods were studied by analysing suspended particulate matter (SPM) for organic carbon (C), total nitrogen (N) and isotopic composition of C (delta C-13(org)). The delta C-13(org) varied from -21.4% during the initial heavy flood phase to -27.1% in the final receding phase. Discharge of terrestrial carbon (-21.4% to -23.5%) from mixed sources with high C/N ratios (14-19) during the initial phase of the flood originated from the semi-arid section of the river. The light carbon (-25.5% to -27.1%) with low C/N ratios (7.2-9.5) in the receding phase of the flood was from local C3-rich organic debris from the deltaic regions along with phytoplankton from aquatic sources. Since the average suspended sediment discharge of River Krishna has decreased from 68 mt to less than 0.1 mt due to construction of dams and barrages, it appears that sediments and organic matter presently being delivered to the oceans are mainly during flood events, and the type of organic matter delivered depends on the nature of the soil where high rainfall is received.
机译：2009年10月，印度半岛的小型半干旱部分的大雨降雨量，与水坝的水释放导致克里希纳河河流中的洪水非常严重。通过分析用于有机碳（C）的悬浮颗粒物（SPM），总氮（N）和C的同位素组成来研究洪水期间和洪水之后的有机质的来源和类型。 δC-13（ORG）在最终后退阶段的初始重型洪水阶段期间从-21.4％变化至-27.1％。在洪水初始阶段的初始阶段源自河流的初始阶段，将陆地碳（-21.4％至-23.5％）从具有高C / N比率（14-19）的混合来源排出。在洪水的后退阶段，低C / N比率（7.2-9.5）的轻碳（-25.5％至-27.1％）来自众多C3的富含C3的有机碎片以及水生源的浮游植物。由于河流河的平均悬浮沉积物放电由于水坝和障碍的构建，因此河流河的平均沉积沉积物从68吨减少到小于0.1吨，因此目前正在送到海洋的沉积物和有机物质主要是在洪水事件中，以及有机物递送取决于收到高降雨的土壤的性质。

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