NDLI: On the relative roles of hydrology, salinity, temperature, and root productivity in controlling soil respiration from coastal swamps (freshwater)

Content Provider	Springer Nature Link
Author	Krauss, Ken W. Whitbeck, Julie L. Howard, Rebecca J.
Copyright Year	2012
Abstract	Soil CO$_{2}$ emissions can dominate gaseous carbon losses from forested wetlands (swamps), especially those positioned in coastal environments. Understanding the varied roles of hydroperiod, salinity, temperature, and root productivity on soil respiration is important in discerning how carbon balances may shift as freshwater swamps retreat inland with sea-level rise and salinity incursion, and convert to mixed communities with marsh plants.We exposed soil mesocosms to combinations of permanent flooding, tide, and salinity, and tracked soil respiration over 2½ growing seasons. We also related these measurements to rates from field sites along the lower Savannah River, Georgia, USA. Soil temperature and root productivity were assessed simultaneously for both experiments.Soil respiration from mesocosms (22.7–1678.2 mg CO$_{2}$ m$^{−2}$ h$^{−1}$) differed significantly among treatments during four of the seven sampling intervals, where permanently flooded treatments contributed to low rates of soil respiration and tidally flooded treatments sometimes contributed to higher rates. Permanent flooding reduced the overall capacity for soil respiration as soils warmed. Salinity did reduce soil respiration at times in tidal treatments, indicating that salinity may affect the amount of CO$_{2}$ respired with tide more strongly than under permanent flooding. However, soil respiration related greatest to root biomass (mesocosm) and standing root length (field); any stress reducing root productivity (incl. salinity and permanent flooding) therefore reduces soil respiration.Overall, we hypothesized a stronger, direct role for salinity on soil respiration, and found that salinity effects were being masked by varied capacities for increases in respiration with soil warming as dictated by hydrology, and the indirect influence that salinity can have on plant productivity.
Starting Page	265
Ending Page	274
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	358
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-03-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon dioxide Flooding Greenhouse gas emissions Mesocosm Swamp forest Tidal treatment Plant Physiology Soil Science & Conservation Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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