Collaborative Research: The Role of Priming in Microbial Utilization of Terrestrially-Derived Dissolved Organic Carbon: A Proof of Concept

合作研究：启动在微生物利用陆地来源的溶解有机碳中的作用：概念证明

基本信息

批准号：
1240161
负责人：
Thomas Bianchi
金额：
$ 6.71万
依托单位：
Texas A&M University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-09-15 至 2013-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1240161&HistoricalAwards=false
关键词：
Collaborative Research Role Priming Microbial

项目摘要

The motivation for this work is the observation of higher than previously thought consumption of terrestrial dissolved organic carbon (TDOC) in inland and coastal waters. One possible mechanism contributing to enhancing consumption of TDOC from soil and plant litter is the "priming effect," which has been demonstrated for soil but not in aquatic systems. The priming effect in soils consists in an increase in the rate of soil mineralization by the addition of labile organic matter. The proponents want to investigate if the priming effect is a general phenomenon of aquatic systems, which would influence the CO2 emissions of both aquatic and terrestrial ecosystems, and affect their nutrient cycles. Their working hypothesis is that microbial consumption of TDOC will be enhanced by the availability of priming substrates derived from available dissolved organic carbon (ADOC), resulting in detectable effects using chemical assays and microcosm experiments. Thus, this study will examine microbial utilization of TDOC in Mississippi waters collected at Baton Rouge where dissolved labile substrates from ADOC mix with TDOC. Determining whether the priming effect affects the process of carbon cycling in aquatic systems and thereby atmospheric C concentrations and the delivery of C to the oceans is of outmost importance for the global carbon budget and making predictions. The PIs want to insert the findings into the US Carbon Cycle Plan. Undergraduate students will be involved in the research.

这项工作的动机是观察到比以前认为的内陆和沿海水域中陆地溶解有机碳（TDOC）更高的观察。 “启动效应”是有助于增加土壤和植物垃圾消耗TDOC的一种可能机制，它已证明是土壤的，但在水生系统中却没有证明。土壤中的启动效应包括通过添加不稳定的有机物来增加土壤矿化的速率。支持者想调查启动效应是否是水生系统的一般现象，这将影响水生生态系统的二氧化碳排放，并影响其营养周期。他们的工作假设是，通过可用的溶解有机碳（ADOC）得出的启动底物的可用性将增强TDOC的微生物消耗，从而使用化学分析和微观实验产生可检测的效果。因此，这项研究将检查在巴吞鲁日收集的密西西比水域中TDOC的微生物利用，在该水中，将其溶解的不稳定底物与TDOC溶解了不稳定的底物。确定启动效应是否影响水生系统中的碳循环过程，从而大气C浓度以及将C向海洋传递到全球碳预算和做出预测至关重要。 PI希望将发现插入美国碳循环计划中。本科生将参与研究。