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Title: Climatic and pollution influences on ecosystem processes in northern hardwood forests

Author: Pregitzer, Kurt S.; Reed, David D.; Mroz, Glenn D.; Burton, Andrew J.; Witter, John A.; Zak, Donald A.;

Date: 1996

Source: In: Hom, John; Birdsey, Richard; O'Brian, Kelly, eds. Proceedings 1995 meeting of the northern global change program; Gen. Tech. Rep. NE-214. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 83-88.

Publication Series: General Technical Report (GTR)

   Note: This article is part of a larger document. View the larger document

Description: The Michigan gradient study was established in 1987 to examine the effects of climate and atmospheric deposition on forest productivity and ecosystem processes in the Great Lakes region. Four intensively-monitored northern hardwood study sites are located along a climatic and pollutant gradient extending from southern lower Michigan to northwestern upper Michigan. The project continues today, with the following overall objectives: (1) to continue measuring key ecosystem variables at four sites; (2) to understand how carbon allocation, nutrient cycling, and forest productivity respond to differing levels of temperature, moisture availability, and atmospheric deposition; and (3) to quantify sources of temporal and spatial variability in ecosystem processes for use in regional modeling efforts. Additional research designed to investigate the effects of soil temperature and N availability on belowground processes was initiated at the sites in 1993. Objectives of this research are: (1) to quantify relationships between soil temperature and fine root longevity, and root system construction and maintenance costs; (2) to determine how soil nitrogen supply affects fine root construction and maintenance costs, and lifespan; (3) to understand the effects of soil temperature and nitrogen availability on soil respiration; and (4) to quantify the contributions of root and microbial respiration to respiratory flux from the soil.

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Citation:


Pregitzer, Kurt S.; Reed, David D.; Mroz, Glenn D.; Burton, Andrew J.; Witter, John A.; Zak, Donald A. 1996. Climatic and pollution influences on ecosystem processes in northern hardwood forests. In: Hom, John; Birdsey, Richard; O''Brian, Kelly, eds. Proceedings 1995 meeting of the northern global change program; Gen. Tech. Rep. NE-214. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 83-88.

 


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