EAPSI: Long-term Carbon Storage in Old vs. New Wetland Sediments along Major River Deltas Influenced by Constructed Diversions

EAPSI：主要河流三角洲沿线旧湿地沉积物与新湿地沉积物的长期碳储存受人工改道的影响

• 批准号: 1613864
• 负责人: Jill Arriola
• 金额: $ 0.04万
• 依托单位: Arriola Jill
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-01 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1613864&HistoricalAwards=false
• 关键词: EAPSI; Long; term; Carbon; Storage; EAPSI; Long; term; Carbon; Storage

River deltas sequester large amounts of organic carbon (C) that originates from either upstream, as terrestrial mineral sedimentation, or through local marine vegetation that decays and is buried. Diminished sediment supply to river deltas can enhance the erosion and release of this sequestered C within deltaic wetlands, thereby potentially releasing CO2 back to the atmosphere through decomposition of organic matter (OM). The Yellow River (Huanghe) in China is the 2nd largest river in terms of sediment load and 6th in terms of drainage length in the world. The rate and location of sediment deposition in the Yellow River Delta (YRD) have been greatly altered by human actions in recent decades. This award supports research that will examine C burial within two different river courses of the YRD, identify the sources of the buried C, and compare these results to other major river deltas, such as the Mississippi River, to understand C storage variations between global rivers with constructed diversions. Under the supervision of Dr. Xuchen Wang, an expert in C dynamics within coastal wetlands in China and the United States, research will be performed at the Ocean University of China in Qingdao. The results of this study will contribute to the formulation of global management strategies focused on finding a balance between optimizing ecosystem services, such as wildlife habitat, and economic viability, such as commercial fisheries, within major river deltas.Sediment cores will be retrieved from wetlands along current and abandoned river courses within the YRD and analyzed for total organic C, total C, and total nitrogen using a CHN analyzer to quantify buried OM. Sediment and local YRD above and below-ground biomass, such as from Phragmites australis and Suaeda salsa, will be analyzed for ä13C isotopes, using an Isotope Ratio Mass Spectrometer, and n-alkanes, through Gas Chromatography, to determine the sources of the buried OM. Changes in odd-over-even predominance of n-alkanes will be utilized as sediment horizons and used to estimate rates of C burial. This NSF award is funded in collaboration with the Chinese Ministry of Science and Technology.This award under the East Asia and Pacific Summer Institutes program supports summer research by a U.S. graduate student and is jointly funded by NSF and the Ministry of Science and Technology of China.

河三角洲的大量有机碳（C）起源于上游，作为地面矿物沉淀，或者是通过腐烂并建造的当地海洋植被。减少到河三角洲的沉积物供应可以增强三角洲湿地内这种隔离C的侵蚀和释放，从而通过有机物的分解（OM）将CO2释放回大气中。就沉积物负荷而言，中国的黄河（Huanghe）是第二大河，就世界排水长而言，是第六河。近几十年来，人类的行动已大大改变了黄河三角洲（YRD）中沉积物沉积的速度和位置。该奖项支持将在一年的两个不同河流课程中检查C埋葬的研究，确定埋藏的C的来源，并将这些结果与其他主要河流三角洲（例如密西西比河）进行比较，以了解全球河流之间的C储存变化。在中国沿海湿地内的C Dynamics专家Xuchen Wang博士的监督下，将在Qingdao的中国海洋大学进行研究。这项研究的结果将有助于全球管理策略的公式，致力于在主要河流三角洲的优化生态系统服务（例如野生生物栖息地（例如野生生物栖息地）和经济生存能力（例如商业渔业）之间保持平衡。将从YRD内的当前和放弃的河流进行总体有机化和总体分析的总体c and nir conn nir cont and c c cyn nir nir c c c cy and nir c c cy and nir c c c c c c c c c c c c c c c c c的层核心将从湿地中检索出来。将使用同位素比率质谱仪和通过气体色谱法确定内置OM的来源，将分析澳大利亚和Suaeda Salsa的沉积物和本地生物量，例如来自Phragmites australis和Suaeda Salsa，用于ä13c同位素。 N-烷烃的奇数偏见的变化将被用作沉积物范围，并用于估计C埋葬的发生率。该NSF奖与中国科学技术部合作。在东亚和太平洋夏季研究所计划下的该奖项支持美国一名研究生的夏季研究，并由NSF和中国科学技术部共同资助。