NDLI: Soil Organic Matter Fractions in Experimental Forested Watersheds

Content Provider	Springer Nature Link
Author	Parker, Jennifer L. Fernandez, Ivan J. Rustad, Lindsey E. rton, Stephen A.
Copyright Year	2002
Abstract	Recent concerns about climate change and atmospheric greenhousegas concentrations have demonstrated the importance ofunderstanding ecosystem C source/sink relationships. Soilorganic matter fractionation was carried out in three paired,forested watershed sites where one of each watershed pairrepresented a different ecosystem perturbation. Theperturbations were 8 years of experimental N amendments at theBear Brook Watershed in Maine (BBWM), a 50 year old intensewildfire and subsequent regeneration at Acadia National Park(ANP), and a 17 year old whole-tree harvest at the Weymouth PointWatershed (WPW). At each site, mineral soils were sampled byuniform depth increments. Mineral soil (< 2 mm) was separatedinto light, occluded light, and heavy density fractions byfloatation in NaI solution (1.7 g cm$^{-3}$). Mineral soil (< 2mm) was also separated into particle-size fractions of sand (2.0to 0.05 mm), silt (0.05 to 0.002 mm), and clay (< 0.002 mm) bywet sieving and centrifugation. Whole soils, and density andparticle-size fractions were analyzed for total C and N. Bothfractionation schemes showed that all soil organic matterfractions had lower C/N ratios as a result of N enrichment atBBWM. At ANP, soil organic matter fractions generally had lowerC/N associated with the wildfire and subsequent shift fromsoftwood to hardwood regeneration. Few significant whole soiland soil organic matter fraction differences were associated withthe whole-tree harvest. Within watershed pairs, both density andparticle-size fractionation techniques usually indicated similarresponses. Soil organic matter fractionation results indicatedthat there were no consistent shifts in fraction distributions inresponse to perturbation that were consistent across all pairedwatershed study sites.
Starting Page	101
Ending Page	121
Page Count	21
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	138
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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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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