NDLI: Patterns of woody plant-derived soil carbon losses and persistence after brush management in a semi-arid grassland

Content Provider	Springer Nature Link
Author	DeMarco, Jennie Filley, Timothy Throop, Heather L.
Copyright Year	2016
Abstract	Woody encroachment and subsequent brush management aimed at reducing woody plant cover can alter soil organic carbon (SOC) pools. However, brush management influences on the sources and stability of SOC is unknown. Using a space-for-time approach in a site with closely co-located patches representing unencroached grassland, woody encroachment, and brush management, we coupled stable isotopes and plant-derived biomarkers to quantify how woody encroachment alters input sources and stability of SOC and how these patterns change with brush management.Stable isotopes, lignin-derived phenols, substituted fatty acids, and carbon content of density fractions were measured in soils collected in shrub canopy interspaces, under live shrubs, and under shrubs killed 8 or 52 y previously.Bulk SOC and C$_{3}$-derived SOC were higher in shallow soil (0–5 cm) under live shrubs than in interspace soil. Long-term brush management showed a decline in total SOC stocks, substituted fatty acids, and C$_{3}$-derived SOC that were associated with the soil light fraction. Despite declines in bulk SOC following brush management, accumulated C$_{3}$-derived SOC pools in the dense fraction remained largely stable following brush management.Woody encroachment increases the proportion of poorly-protected light fraction and loosely-mineral associated SOC derived from leaf litter, which is lost within several decades after brush management. However, woody encroachment produced a stabilized mineral-bound pool of C$_{3}$- and C$_{4}$-derived SOC that remained 52 years after brush management, suggesting that woody encroachment has the potential for long-term SOC stabilization.
Starting Page	277
Ending Page	293
Page Count	17
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	406
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-04-07
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon isotopes Cupric oxide oxidation Lignin-derived phenols Sonoran Desert Woody encroachment Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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