Manganese biogeochemistry in a small Adirondack forested lake watershed

Journal Article · Sat Nov 01 04:00:00 EST 1986 · Water Resour. Res.; (United States)

DOI:https://doi.org/10.1029/WR022i012p01647· OSTI ID:7094797

Shanley, J B

In September and October 1981, manganese (Mn) concentrations and pH were intensively monitored in a small forested lake watershed in the west-central Adirondack Mountains, New York, during two large acidic storms (each approx.5 cm rainfall, pH 4.61 and 4.15). The data were evaluated to identify biogeochemical pathways of Mn and to assess how these pathways are altered by acidic atmospheric inputs. Concentrations of Mn averaged 1.1 ..mu..g/L in precipitation and increased to 107 ..mu..g/L in canopy throughfall, the enrichment reflecting active biological cycling of Mn. Rain pH and throughfall Mn were negatively correlated, suggesting that foliar leaching of Mn was enhanced by rainfall acidity. The pulse-like input of Mn to the forest floor in the high initial concentrations in throughfall (approx.1000 ..mu..g/L) did not affect Mn concentrations in soil water (<20 ..mu..g/L) or groundwater (usually <40 ..mu..g/L), which varied little with time. In the inlet stream, Mn concentrations remained constant at 48 ..mu..g/L as discharge varied from 1.1 to 96 L/s. Manganese was retained in the vegetative cycle and regulated in the stream by adsorption in the soil organic horizon. The high Mn levels in the stream may be linked to its high acidity (pH 4.2-4.3). Mixing of Mn-rich stream water with neutral lake water (pH 7.0) caused precipitation of Mn and deposition in lake sediment.

• Research Organization: Geological Survey, Doraville, GA
• OSTI ID: 7094797
• Journal Information: Water Resour. Res.; (United States), Journal Name: Water Resour. Res.; (United States) Vol. 22:12; ISSN WRERA
• Country of Publication: United States
• Language: English

Related Subjects

520200* -- Environment
Aquatic-- Chemicals Monitoring &amp; Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACID RAIN
ADIRONDACK MOUNTAINS
APPALACHIAN MOUNTAINS
ATMOSPHERIC PRECIPITATIONS
BIOGEOCHEMISTRY
CHEMISTRY
DISSOLUTION
ECOLOGICAL CONCENTRATION
ELEMENTS
ENVIRONMENTAL EFFECTS
FEDERAL REGION II
GEOCHEMISTRY
LEACHING
MANGANESE
METALS
MONITORING
MOUNTAINS
NEW YORK
NORTH AMERICA
PH VALUE
POLLUTION
RAIN
SEPARATION PROCESSES
SOILS
TRANSITION ELEMENTS
USA
WATER POLLUTION
WATERSHEDS