LTREB: Long-term Detrital Controls on Soil Organic Matter Stabilization

LTREB：土壤有机质稳定的长期碎屑控制

• 批准号: 0817064
• 负责人: Kate Lajtha
• 金额: $ 40万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0817064&HistoricalAwards=false
• 关键词: LTREB; Long; term; Detrital; Controls

Soil organic matter (SOM) contains more carbon than plant biomass and the atmosphere combined. Despite its important role in the global life support system, interactions among biological, chemical, and physical processes regulating SOM accumulation, stabilization, and turnover are poorly understood. The DIRT (Detrital Inputs and Removal Treatments) experiment, started at the H.J. Andrews Forest in 1997, is a multi-decade experiment that manipulates plant-litter inputs to large plots in a western coniferous forest. This experiment is designed to address such questions as: what controls the long-term storage of carbon in forest soils? What chemical and physical fractions of SOM are most stable? Can added inputs of detritus increase soil carbon storage, or is maximum storage determined exclusively by climate and soil mineralogy? By following changes in soil carbon in the DIRT plots over the next few decades, we will address these long-term questions directly.The multi-decade, experimental nature of the DIRT experiment is uniquely suited to explore the role of plant detrital quality and quantity in determining SOM accumulation, which is a significant unknown factor in current ecosystem models. In addition, this research focuses on research training of undergraduate Honors students, and this experiment will be incorporated into an Honors Ecology course required of all Honors Environmental Science students at Oregon State University. Both data and soils from this experiment will be made available to researchers across the globe through the Andrews LTER web site. This experiment will be available to researchers, students and climate modelers for decades to come.

土壤有机质 (SOM) 含有的碳比植物生物量和大气的总和还要多。 尽管它在全球生命支持系统中发挥着重要作用，但调节 SOM 积累、稳定和周转的生物、化学和物理过程之间的相互作用却知之甚少。 DIRT（碎屑输入和去除处理）实验于 1997 年在 H.J. Andrews 森林开始，是一项长达数十年的实验，旨在控制西部针叶林大片土地上的植物凋落物输入。 该实验旨在解决以下问题：是什么控制着森林土壤中碳的长期储存？ SOM 的哪些化学和物理部分最稳定？ 添加碎屑的投入是否可以增加土壤碳储存量，或者最大储存量是否完全由气候和土壤矿物学决定？ 通过跟踪未来几十年 DIRT 地块中土壤碳的变化，我们将直接解决这些长期问题。DIRT 实验的数十年实验性质非常适合探索植物碎屑质量和数量在确定 SOM 积累中的作用，而 SOM 积累是当前生态系统模型中的一个重要未知因素。 此外，这项研究的重点是本科荣誉学生的研究训练，该实验将被纳入俄勒冈州立大学所有环境科学荣誉学生必修的荣誉生态学课程中。 该实验的数据和土壤将通过安德鲁斯 LTER 网站向全球研究人员开放。 这项实验将在未来几十年内供研究人员、学生和气候建模者使用。