NDLI: The sensitivity of ecosystem carbon exchange to seasonal precipitation and woody plant encroachment

Content Provider	Springer Nature Link
Author	Potts, D. L. Huxman, T. E. Scott, R. L. Williams, D. G. Goodrich, D. C.
Copyright Year	2006
Abstract	Ongoing, widespread increases in woody plant abundance in historical grasslands and savannas (woody encroachment) likely will interact with future precipitation variability to influence seasonal patterns of carbon cycling in water-limited regions. To characterize the effects of woody encroachment on the sensitivity of ecosystem carbon exchange to seasonal rainfall in a semi-arid riparian setting we used flux-duration analysis to compare 2003-growing season NEE data from a riparian grassland and shrubland. Though less seasonally variable than the grassland, shrubland NEE was more responsive to monsoon rains than anticipated. During the 2004-growing season we measured leaf gas exchange and collected leaf tissue for δ13C and nitrogen content analysis periodically among three size classes of the dominant woody-plant, Prosopis velutina and the dominant understory species, Sporobolus wrightii, a C4 bunchgrass, present at the shrubland. We observed size-class and plant functional type independent patterns of seasonal plant performance consistent with greater-than-anticipated sensitivity of NEE in the shrubland. This research highlights the complex interaction between growing-season precipitation, plant-available alluvial groundwater and woody plant abundance governing ecosystem carbon balance in this semi-arid watershed.
Starting Page	453
Ending Page	463
Page Count	11
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	150
Issue Number	3
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-09-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flux-duration analysis Photosynthesis Woody encroachment Precipitation variability Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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