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CR 28:163-173 (2005)
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Abstract
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Effects of climate and land use on landscape soil respiration in northern Wisconsin, USA: 1972 to 2001
Daolan Zheng1,*, Jiquan Chen1, Asko Noormets1, Eugénie S. Euskirchen2, James Le Moine1
1Department of Earth, Ecological, and Environmental Sciences, The University of Toledo, Toledo, Ohio 43606, USA 2Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska 99775, USA
*Email: dzheng@utnet.utoledo.edu
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ABSTRACT: Changes in climate and land use affect soil respiration rates (SRR) significantly, but studies of these effects across entire landscapes are rare. We simulated responses of landscape mean SRR (LMSRR) to such changes from May to October over a 30
yr period in a managed, predominantly forested landscape in northern Wisconsin, USA, using: (1) 6 satellite-derived land-cover maps (1972, 1978, 1982, 1987, 1992, and 2001); (2) monthly air temperature data in the corresponding years of the cover maps;
and (3) SRR models driven by soil temperature (Ts) at 5 cm depth. LMSRR seemed to increase linearly by 77% from 0.625 in May to 1.104 g CO2 m2 h1 in July, and then decreased at an increasing
rate to 0.411 g CO2 m2 h1 in October. LMSRR was more sensitive to an increase of minimum temperature than that of mean or maximum temperature, suggesting that future climate change might impact SRR in
high-latitude forests more than other biomes. LMSRR in September over the study period was similar to that of June but with 92% higher variation, while both landscape mean air temperature and precipitation in September had lower variation than in June.
This indicates that the topsoil layer functions differently during soil warming and cooling phases. Changes in land cover composition from 1972 to 2001 increased LMSRR by 2.8 to 3.1% while 2°C differences in growing season mean air temperature
increased the SRR by 6.7 to 7.0%. The combined effects of both variables on the SRR are more complex, varying from 3.8 to 10.0%.
KEY WORDS: Landscape-scale soil respiration · Temperature variation · Landscape composition · Empirical model · Carbon flux
Full text in pdf format
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Published in CR Vol.
28, No. 2
(2005) on March 16
Print ISSN: 0936-577X; Online ISSN: 1616-1572.
Copyright © Inter-Research, Oldendorf/Luhe, 2005
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