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Changes in aboveground primary production and carbon and nitrogen pools accompanying woody plant

Summary: Changes in aboveground primary production and carbon
and nitrogen pools accompanying woody plant
encroachment in a temperate savanna
R . F L I N T H U G H E S *, S T E V E N R . A R C H E R w , G R E G O R Y P. A S N E R z,
C A R O L A . W E S S M A N § , C H A D M C M U R T R Y w, J I M N E L S O N } and R . J A M E S A N S L E Y k
*Institute of Pacific Islands Forestry, USDA Forest Service, PO Box 4370, 60 Nowelo Street, Hilo, HI 96720, USA, wSchool of
Natural Resources, University of Arizona, Tucson, AZ 85721-0043, USA, zDepartment of Global Ecology, Carnegie Institute of
Washington, Stanford University, Stanford, CA 94305, USA, §Cooperative Institute for Research in Environmental Sciences &
Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309-0216, USA, }Department of Plant &
Soil Science, University of Kentucky, Lexington, KY 40546-0091, USA, kTexas Agricultural Experiment Station, PO Box 1658,
11708 Highway 70 South, Vernon, TX 76384, USA
When woody plant abundance increases in grasslands and savannas, a phenomenon
widely observed worldwide, there is considerable uncertainty as to whether above-
ground net primary productivity (ANPP) and ecosystem carbon (C) and nitrogen (N)
pools increase, decrease, or remain the same. We estimated ANPP and C and N pools in
aboveground vegetation and surface soils on shallow clay and clay loam soils under-
going encroachment by Prosopis glandulosa in the Southern Great Plains of the United
States. Aboveground Prosopis C and N mass increased linearly, and ANPP increased
logarithmically, with stand age on clay loam soils; on shallow clays, Prosopis C and N


Source: Archer, Steven R. - Savanna/Woodland Ecology Lab., School of Natural Resources and the Environment, University of Arizona


Collections: Environmental Sciences and Ecology