LTREB: Long-term, Broad-scale Experiments on Fine Litter and Root Decomposition: LIDET II

LTREB：关于细小凋落物和根分解的长期、大规模实验：LIDET II

• 批准号: 9806493
• 负责人: Mark Harmon
• 金额: $ 30万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806493&HistoricalAwards=false
• 关键词: LTREB; Long; term; Broad; scale

9806493 Harmon Leaf and root decomposition can be thought of as a continuous process beginning with fresh plant litter and leading to the fomation of increasingly refractory organic matter. This refractory material is thought to be a precursor to soil organic matter, and thus influences nutrient availability, production, and carbon sequestration in ecosystems. A team, LIDET (Long-term Intersite Decomposition Experiment Team), has installed a set of experiments to test the effects of macroclimate and substrate quality on the long-term carbon and nutrient dynamics of leaf and fine root litter. These long-term experiments involve 16 LTER and 11 other cooperating sites, and a total of 31 types of litter. The experiments are designed to follow changes in mass, organic fractions, and nutrients for up to 10 years. Now that the study as passed its half-way point, continued funding will allow the completion of data collection, laboratory analysis of organic constituents, and nutrient content. In addition, data will be made available over the Internet. The plan is to continue the original design and to add a new study on the chemistry of native litters at each site. This new work will provide a litter chemistry data set that is compatible with the LIDET decomposition data and will also allow broad-scale extrapolation of the substrate quality findings of the experiment. The data generated by this study will prove extremely useful in future modeling and synthesis efforts. This funding will also provide the investigators the time and money to complete this long-term intersite project.

9806493哈蒙叶和根的分解可以被认为是一个连续的过程，从新鲜的植物凋落物开始，导致越来越难处理的有机物质的形成。这种耐火材料被认为是土壤有机质的前体，因此影响生态系统中养分的可获得性、产量和碳固存。一个名为LIDET(长期站点间分解实验团队)的团队安装了一系列实验，以测试大气候和基质质量对叶片和细根凋落物长期碳和养分动态的影响。这些长期实验涉及16个LTER和11个其他合作地点，总共涉及31种垃圾。这些实验旨在长达10年的时间里跟踪质量、有机成分和营养物质的变化。现在这项研究已经过半，继续提供资金将允许完成数据收集、有机成分和营养含量的实验室分析。此外，还将通过互联网提供数据。该计划将继续原来的设计，并在每个地点增加一项关于原生垃圾化学的新研究。这项新工作将提供一个与LIDET分解数据兼容的凋落物化学数据集，并将允许对实验的衬底质量结果进行广泛的外推。这项研究产生的数据将被证明在未来的建模和综合工作中非常有用。这笔资金还将为调查人员提供时间和资金，以完成这一长期的场地间项目。