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The Michigan Gradient Study: Long-term Data Sets |
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Long-term
records of key variables along the climatic-pollutant gradient allow us to
study ecosystem processes under real-world environmental conditions. Some measurements have been continuously
recorded since 1987, and in many instances, 16 to 18 years of data
exist. Data since 1994 contains
values for both control and simulated NO3- deposition
treatments. The long-term data base includes the following parameters: forest productivity (basal area growth,
height growth, biomass increment, individual tree vigor and mortality); soil
and root respiration; wet deposition, soil solution chemistry, include NO3-,
DOC and DON; site water balance and
solution leaching losses; soil and air temperature; soil moisture
availability; above and below-ground litter inputs; seed production, leaf and
fine root nutrient contents; leaf area index; insect defoliation; soil
chemical and physical properties; leaf and root nitrate reductase activity;
soil enzyme activity; microbial biomass and community composition; and N
mineralization and nitrification. Much
of this data is available on-line through the links
below.
The links below provide data summaries for several of our important long-term data sets. More detailed data than provided in the summaries as well as other data listed above can be obtained by making a formal request to Dr. Kurt Pregitzer (kspregit@mtu.edu). All users of our data should properly acknowledge the source. Data Currently Available On-Line: Growth and Productivity
Data (basal area, basal area increment, biomass, biomass increment) Litterfall and Foliage
Data (foliar, woody and total litter mass, leaf litter N and C
concentration, leaf litter SLA, stand LAI) Climatic Data (air
temperature, soil temperature, soil moisture, precipitation) Site Water Balance (monthly precipitation, temperature, AET,
PET, moisture deficit and soil solution leaching flux) Soil
Solution Data (DOC, DON, NO3-, NH4+) Soil respiration |
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