Little Rock Lake Experiment at North Temperate Lakes LTER: Snow and Ice Depth 1984 - 2000

The Little Rock Acidification Experiment was a joint project involving the USEPA (Duluth
Lab), University of Minnesota-Twin Cities, University of Wisconsin-Superior, University of
Wisconsin-Madison, and the Wisconsin Department of Natural Resources. Little Rock Lake is a
bi-lobed lake in Vilas County, Wisconsin, USA. In 1983 the lake was divided in half by an
impermeable curtain and from 1984-1989 the northern basin of the lake was acidified with
sulfuric acid in three two-year stages. The target pHs for 1984-5, 1986-7, and 1988-9 were
5.7, 5.2, and 4.7, respectively. Starting in 1990 the lake was allowed to recover naturally
with the curtain still in place. Data were collected through 2000. The main objective was to
understand the population, community, and ecosystem responses to whole-lake acidification.
Funding for this project was provided by the USEPA and NSF. Snow and ice depth are measured
during the winter months on the reference and treatment basins of Little Rock Lake. Sampling
Frequency: varies - Number of sites: 4

小石城酸化实验（Little Rock Acidification Experiment）是由美国环境保护署（United States Environmental Protection Agency，USEPA，德卢斯实验室）、明尼苏达大学双城分校、威斯康星大学苏必利尔分校、威斯康星大学麦迪逊分校以及威斯康星州自然资源部联合开展的合作研究项目。小石城湖（Little Rock Lake）为美国威斯康星州维拉斯县的双叶状湖泊，1983年通过不透水帷幕被分割为两个盆地；1984年至1989年间，研究团队分三个为期两年的阶段对湖北部盆地施加硫酸进行酸化处理，1984-1985年、1986-1987年与1988-1989年三个阶段的目标pH值分别为5.7、5.2与4.7。1990年起，在不透水帷幕保留的前提下，湖泊开始自然恢复，相关数据采集工作持续至2000年。本项目的核心研究目标为探明全湖酸化条件下的种群、群落及生态系统响应规律，资助方为美国环境保护署（USEPA）与美国国家科学基金会（National Science Foundation，NSF）。冬季期间，研究人员会对小石城湖的参照盆地与处理盆地开展积雪深度与冰厚监测。采样频率：不固定；采样点位数量：4个