Collaborative Research: The Fate of Algal Carbon in Continental Slope Sediments: A Multitracer Approach

布莱尔9301793 该项目旨在确定海底新沉积的藻类碳的迁移和分解。将在两个底栖动物密度不同的北卡罗来纳州大陆坡地点的海底散布多种示踪剂混合物（13 C-藻类、粘土、玻璃珠），以确定动物种群对颗粒混合和有机碳周转的影响。 13 C将随后通过各种储层（例如，固相有机和无机碳、溶解无机碳、动物组织），时间范围从几天到一年。 将确定特定藻类生物化学品降解的表观速率常数。 将调查底栖生态系统藻类碳周转所产生的成岩产物的鉴定，并将其与天然存在的234 Th和210 Pb剖面相关联。将评价存款给料器对有机物含量、粒度和摄入材料质量的潜在选择性。 将研究底栖动物对13 C-藻类物质的吸收，以确定不同摄食方式、沉积柱内分布和身体大小的相对重要性。

BLAIR 9301793 This project is aimed at defining the transport and decomposition of newly deposited algal carbon in the seabed. A multi-tracer mixture (13C-Algae, clay, glass beads) will be spread on the seafloor at two North Carolina continental slope sites that are characterized by different infaunal densities to determine the impact of animal populations on particle mixing and organic carbon turnover. The 13C will be followed through various reservoirs (e.g., solid phase organic and inorganic carbon, dissolved inorganic carbon, animal tissues) on time scales ranging from days to one year. Apparent rate constants for the degradation of specific algal biochemicals will be determined. Identification of diagenetic products resulting from the turnover of the algal carbon by the benthic ecosystem will be investigated and related to the naturally occurring profiles of 234Th and 210Pb. Potential selectivity by deposit feeders for organic content, particle size and quality of material ingested will be evaluated. Uptake of 13C- algal material by infauna will be studied to determine the relative importance of different feeding modes, distributions within the sediment column and body sizes.