LTREB: Continuing Assessment of Ecological Recovery Following Experimental Acidification of Little Rock Lake, Wisconsin

LTREB：威斯康星州小石湖实验酸化后生态恢复的持续评估

• 批准号: 9815519
• 负责人: Timothy Kratz
• 金额: $ 11.76万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-15 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9815519&HistoricalAwards=false
• 关键词: LTREB; Continuing; Assessment; Ecological; Recovery

Little Rock Lake in northern Wisconsin has been the site of a whole-lake acidification experiment since 1983. The lake was divided into a reference basin that was left unmodified and a treatment basin that was acidified between 1985 and 1990. During the three, 2-year phases of increasing acidification, the PIs documented a wide range of responses to the acid additions. Since 1991, the PIs have been evaluating the natural capacity of the lake to recover from the direct and indirect effects of acidification. The lake has largely returned to pre-acidified chemical conditions. By spring 1995, the lake's pH was close to the 6.1 value that occurred prior to the manipulation. In contrast, some biological characteristics of the lake exhibited a substantially slower recovery. In particular, through 1996, the taxonomic composition of the treatment basin's zooplankton community remained different from the community occurring in the reference basin. By 1997, however, there were signs that the zooplankton were beginning to be similar in the treatment and reference basins. This project will complete the PIs evaluation of Little Rock Lake's recovery and test the hypothesis that the treatment basin's zooplankton community will be essentially the same as that in the reference basin in 1999 and 2000, 9 and 10 years following the last acid additions. The PIs will also evaluate an analytical technique to distinguish whether the zooplankton community in the treatment basin has formed a long-standing community distinctly different from that in the reference basin or if there was a delayed response in its recovery. Large-scale experiments such as the Little Rock Lake project operate at an interface between applied and theoretical ecology. Completing the PIs evaluation of the lake's recovery will allow the PIs to complete the documentation of Little Rock Lake's full range of reactions to acidification and to evaluate some of the basic processes that control long-term dynamics in lakes.

自1983年以来，威斯康星州北方的小石城湖一直是全湖酸化实验的地点。 该湖被分为一个未被修改的参考盆地和一个在1985年至1990年期间酸化的处理盆地。 在三个2年的酸化增加阶段，PI记录了对酸添加的广泛反应。 自1991年以来，PI一直在评估湖泊从酸化的直接和间接影响中恢复的自然能力。 该湖已基本恢复到酸化前的化学条件。 到1995年春天，湖泊的pH值接近于操作前的6.1。 相比之下，湖泊的一些生物特征表现出明显较慢的恢复。 特别是，通过1996年，处理流域的浮游动物群落的分类组成仍然不同于发生在参考流域的社区。 然而，到1997年，有迹象表明，浮游动物开始在治疗和参考流域相似。 该项目将完成对小石城湖恢复情况的PI评估，并检验处理盆地的浮游动物群落在1999年和2000年（最后一次加酸后的9年和10年）与参考盆地基本相同的假设。 主要研究人员还将评价一种分析技术，以区分处理池中的浮游动物群落是否形成了一个与参考池明显不同的长期群落，或者其恢复是否有延迟反应。像小石城湖项目这样的大规模实验是在应用生态学和理论生态学之间的界面上进行的。 完成对小石城湖恢复情况的PI评估，将使PI能够完成小石城湖对酸化的全方位反应的记录，并评估控制湖泊长期动态的一些基本过程。