NDLI: Predominance of ecophysiological controls on soil CO$

Content Provider	Springer Nature Link
Author	Craine, Joseph M. Wedin, David A. Chapin, F. Stuart
Copyright Year	1998
Abstract	Ecosystem studies often study soil CO$_{2}$ flux as a function of environmental factors, such as temperature, that affect respiration rates by changing the rate of utilization of carbon substrates. These studies tend not to include factors, such as photosynthesis, that affect the supply of carbon substrates to roots and root-associated processes. We examined the role of decreased carbohydrate source on soil CO$_{2}$ flux and root respiration in an annually-burned grassland through manipulations of light intensity and removal of above ground biomass. We also quantified the contribution of root respiration to soil CO$_{2}$ flux by measuring the respiration rates of excised roots. Two days of shading caused a 40% reduction in soil CO$_{2}$ flux, while clipping was associated with a 19% reduction in soil CO$_{2}$ flux. Both reductions were independent of soil and air temperature at the time of measurement. The relative decrease in soil CO$_{2}$ flux observed in the clipping experiment was similar in magnitude to an observed decrease in root respiration per gram of root, linking decreased root activity and soil CO$_{2}$ flux. From these experiments, we conclude that variation in factors that affect carbon availability to roots can be important determinants of soil CO$_{2}$ flux and should be included explicitly in studies that measure or model soil CO$_{2}$ flux.
Starting Page	77
Ending Page	86
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	207
Issue Number	1
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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