LTREB: Five Decades of Biogeochemical Change in Soils and Ecosystems of an Old-Field Forest

LTREB：古老森林土壤和生态系统的五年生物地球化学变化

• 批准号: 0129383
• 负责人: Daniel Richter
• 金额: $ 23.56万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0129383&HistoricalAwards=false
• 关键词: LTREB; Five; Decades; Biogeochemical; Change

Richter0129383Research at the Calhoun Experimental Forest has investigated rates and processes of soil biogeochemical change over four decades of forest-ecosystem development. From this work it is clear that soils are dynamic components of ecosystems remarkably responsive to ecosystem change. Continuation of this study by LTREB will allow continued testing of hypotheses and objectives that together will result in critical continuity for research development at this site. The three hypotheses concern: (1) the depletability and resupply of soil micronutrients over four decades of forest development, (2) soil SO4 and whether SO4 is decreasing in the last two decades in a pattern indicative of reduced air-pollution inputs, and (3) recent changes in soil and whole-ecosystem sequestration of C 14C, and N. Making this particularly compelling is the recent disturbance by bark beetles, ice and wind damage which together have decreased leaf area by as much as 50%, increasing litterfall inputs to the forest floor, and greatly accelerating growth of understory hardwoods. Because the Calhoun archive has nearly all soil samples collected since 1962, investigators have the ability to conduct retrospective analyses on soil and ecosystem biochemical change. The project also includes a program of educational outreach with undergraduate and high school science students, and data management improvements to expand the use of the Calhoun data for current and future researchers.

卡尔霍恩实验森林的研究调查了40年来森林生态系统发展的土壤地球化学变化的速率和过程。从这项工作中可以清楚地看出，土壤是生态系统的动态组成部分，对生态系统的变化有着显着的反应。LTREB继续进行本研究将允许继续检验假设和目标，这些假设和目标将共同导致该研究中心研究开发的关键连续性。这三个假设涉及：（1）40年森林发展过程中土壤微量营养素的消耗和再供应;（2）土壤SO 4以及SO 4在过去20年中是否以一种表明空气污染输入减少的模式减少;（3）土壤和整个生态系统中C 14 C和N的固存最近的变化。使这一点特别引人注目的是最近的干扰树皮甲虫，冰和风的损害，一起减少了多达50%的叶面积，增加凋落物输入到森林地面，并大大加快林下硬木的增长。由于卡尔霍恩档案馆几乎拥有自1962年以来收集的所有土壤样本，调查人员有能力对土壤和生态系统的生化变化进行回顾性分析。该项目还包括一个与本科和高中理科学生的教育推广计划，以及数据管理改进，以扩大卡尔霍恩数据对当前和未来研究人员的使用。