Existing Soil Carbon Models Do Not Apply to Forested Wetlands

Existing Soil Carbon Models Do Not Apply to Forested Wetlands

by C.C. Trettin, B. Song, M.F. Jurgensen, C. Li
     
 
When assessing the biological,geological,and chemical cycling of nutrients and elements ù or when assessing carbon dynamics with respect to global change ù modeling and simulation are necessary. Although wetlands occupy a relatively small proportion of EarthÆs terrestrial surface (<3 percent), they contain a disproportionate share of the

Overview

When assessing the biological,geological,and chemical cycling of nutrients and elements ù or when assessing carbon dynamics with respect to global change ù modeling and simulation are necessary. Although wetlands occupy a relatively small proportion of EarthÆs terrestrial surface (<3 percent), they contain a disproportionate share of the terrestrial carbon pool (15 to 22 percent). Models that do not accurately represent wetland soil processes cannot,therefore,provide reasonable simulations. We evaluated 12 widely used soil C models to determine their applicability to wetland ecosystems: CANDY, CENTURY, DAISY, DNDC, ITE, MBL-GEM, NCSOIL, QSOIL, ROTHC, SOMM, VVV, and WMEM. Only three (CENTURY, DNDC, and WMEM) allow for anaerobic conditions; none contains components for anoxia,ground water hydrology, multiple organic and physical soil layers,or a daily time-step, all of which are necessary when modeling soil C in wet soils.Accordingly for any land area that includes wetlands, none of the individual models would produce reasonable simulations based on soil processes. We present a wetland soil C model framework based on desired attributes, the DNDC model,and components of the CENTURY and WMEM models. Our proposed synthesis would be appropriate when considering soil C dynamics at multiple spatial scales and where the land area considered includes both wetland and upland ecosystems.

Product Details

ISBN-13:
2940013204607
Publisher:
1001 Property Solutions LLC
Publication date:
08/11/2011
Sold by:
Barnes & Noble
Format:
NOOK Book
File size:
101 KB

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