Biological and land use controls on the isotopic composition of aquatic carbon in the Upper Mississippi River Basin

Voss Britta M.; Wickland Kimberly P.; Aiken George R.; Striegl Robert G.

摘要

Abstract > Riverine ecosystems receive organic matter (OM) from terrestrial sources, internally produce new OM, and biogeochemically cycle and modify organic and inorganic carbon. Major gaps remain in the understanding of the relationships between carbon sources and processing in river systems. Here we synthesize isotopic, elemental, and molecular properties of dissolved organic carbon (DOC), particulate organic carbon (POC), and dissolved inorganic carbon (DIC) in the Upper Mississippi River (UMR) system above Wabasha, MN, including the main stem Mississippi River and its four major tributaries (Minnesota, upper Mississippi, St. Croix, and Chippewa Rivers). Our goal was to elucidate how biological processing modifies the chemical and isotopic composition of aquatic carbon pools during transport downstream in a large river system with natural and man‐made impoundments. Relationships between land cover and DOC carbon‐isotope composition, absorbance, and hydrophobic acid content indicate that DOC retains terrestrial carbon source information, while the terrestrial POC signal is largely replaced by autochthonous organic matter, and DIC integrates the influence of in‐stream photosynthesis and respiration of organic matter. The UMR is slightly heterotrophic throughout the year, but pools formed by low‐head navigation dams and natural impoundments promote a shift toward autotrophic conditions, altering aquatic ecosystem dynamics and POC and DIC compositions. Such changes likely occur in all major river systems affected by low‐head dams and need to be incorporated into our understanding of inland water carbon dynamics and processes controlling CO <sub>2</sub> emissions from rivers, as new navigation and flood control systems are planned for future river and water resources management. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”> <标题类型=“main”>抽象</ title> >河滨生态系统从地面来源接受有机物质（OM），内部产生新的OM，生物地球化学循环，改变有机和无机碳。主要差距仍然是理解河流系统中碳源与加工之间的关系。在这里，我们在Wabasha，Mn上方的溶解有机碳（DOC），颗粒有机碳（DIC），颗粒状有机碳（POC），溶解的无机碳（DIC）中合成同位素，元素和分子特性，包括主干密西西比河及其四大支流（明尼苏达州，上部密西西比州，圣克罗伊和Chippewa Rivers）。我们的目标是阐明生物学处理如何在具有自然和人为蓄水池的大型河流系统的下游运输过程中改变水生碳库的化学和同位素组成。陆地覆盖和DOC碳 - 同位素组成，吸光度和疏水酸含量之间的关系表明，DOC保留了陆地碳源信息，而地面POC信号大大替代，并且DIC集成了流中的光合作用的影响和有机物质的呼吸。 UMR全年略有异养，但是由低头导航坝和天然蓄水量形成的池促进了朝向自养疾病的转变，改变了水生生态系统动态和POC和DIC组成。这种变化可能发生在受低压大坝影响的所有主要河流系统中，并且需要纳入我们对内陆水碳动力学的理解和控制河流的CO <Sub> 2 </ Sub>排放，作为新的导航和防洪系统计划为未来的河流和水资源管理。 </ p> </ abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-23728/'>《Global Biogeochemical Cycles》</a> <b style="margin: 0 2px;">|</b><span>2017年第8期</span><b style="margin: 0 2px;">|</b><span>共18页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Voss Britta M.&option=202" target="_blank" rel="nofollow">Voss Britta M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wickland Kimberly P.&option=202" target="_blank" rel="nofollow">Wickland Kimberly P.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Aiken George R.&option=202" target="_blank" rel="nofollow">Aiken George R.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Striegl Robert G.&option=202" target="_blank" rel="nofollow">Striegl Robert G.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>U.S. Geological SurveyBoulder Colorado USA;</p> <p>U.S. Geological SurveyBoulder Colorado USA;</p> <p>U.S. Geological SurveyBoulder Colorado USA;</p> <p>U.S. Geological SurveyBoulder Colorado USA;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/165.html" title="地质学">地质学;</a><a href="https://www.zhangqiaokeyan.com/clc/5109.html" title="生物地球化学、气体地球化学">生物地球化学、气体地球化学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Mississippi River&option=203" rel="nofollow">Mississippi River;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=aquatic carbon&option=203" rel="nofollow">aquatic carbon;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=biogeochemistry&option=203" rel="nofollow">biogeochemistry;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=isotopes&option=203" rel="nofollow">isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=land cover&option=203" rel="nofollow">land cover;</a> </p> <div class="translation"> 机译：密西西比河;水生碳;生物地球化学;同位素;陆地覆盖; 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