LTREB: Collaborative Research: Hydrologic-nutrient Cycle Interaction in Small, Undisturbed and Human-manipulated Ecosystems

LTREB：合作研究：小型、未受干扰和人为操纵的生态系统中的水文-养分循环相互作用

• 批准号: 9308089
• 负责人: Gene Likens
• 金额: $ 53.5万
• 依托单位: Cary Institute of Ecosystem Studies, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-10-01 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9308089&HistoricalAwards=false
• 关键词: LTREB; Collaborative; Research; Hydrologic; nutrient

In this collaborative project scientists at the Institute of Ecosystem Studies and Syracuse University will continue long-term biogeochemical studies at the Hubbard Brook Experimental Forest (HBEF) in New Hampshire to evaluate trends in atmospheric deposition, streamwater chemistry and cycling of critical nutrient elements. During the past three decades, dramatic changes in atmospheric deposition, streamwater chemistry, vegetation biomass and soil chemistry were observed at the HBEF. These changes have important ecological implications for the management of base-poor forest ecosystems, which are widespread throughout the northeastern U.S. In particular, a decline in atmospheric inputs of base cations has increased the sensitivity of forest and aquatic ecosystems to continuing high inputs of acidic deposition, as well as to forest management practices, such as harvest by clearcutting. Neither the decline in atmospheric inputs nor declines in forest floor concentrations of base cations observed during this period were predicted from existing knowledge or from models of nutrient cycling for forest ecosystems. Significantly, the pattern of recovery following anthropogenic acidification suggests that acidification may not be a fully reversible process. %%% Long-term efforts at synthesis and integration of biogeochemical information at Hubbard Brook will be continued. Results from this research will improve the understanding of biogeochemical flux and cycling in forest ecosystems of the northeastern U.S. In addition, the continuation of the long-term record of precipitation, streamwater and soilwater chemistry at Hubbard Brook will provide a basis for interpreting the effects of changing atmospheric deposition on biogeochemical processes in terrestrial and associated aquatic ecosystems.

在这位生态系统研究所和锡拉丘兹大学的合作项目科学家中，将继续在新罕布什尔州的哈伯德·布鲁克实验森林（HBEF）上长期生物地球化学研究，以评估重要营养元素的大气沉积，流水化学和循环的大气沉积趋势。 在过去的三十年中，在HBEF上观察到大气沉积，溪流化学，植被生物量和土壤化学的急剧变化。 这些变化对基础贫困森林生态系统的管理具有重要的生态影响，这些生态系统尤其是在美国东北部的广泛存在，碱性阳离子大气投入的下降增加了森林和水生生态系统的敏感性，以持续的高酸性沉积投入，以及通过清除森林管理实践，例如通过清除森林管理实践。 在此期间观察到的碱基阳离子的森林底浓度下，大气输入的下降或下降均未从现有知识或森林生态系统的营养循环模型中预测。 值得注意的是，人为酸化后的恢复模式表明，酸化可能不是完全可逆的过程。 在哈伯德溪（Hubbard Brook）合成和整合生物地球化学信息的长期努力将继续进行。 这项研究的结果将提高对美国东北部森林生态系统的生物地球化学通量和骑自行车的理解，此外，Hubbard Brook在Hubbard Brook的降水量，流水和土壤水中化学的长期记录的延续将提供一个基础，以解释大气层沉积对生物质学对地球化学对地面和相关型生成型的影响的基础。