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Shrub encroachment in North American grasslands: shifts in growth form dominance rapidly alters control of

Summary: Shrub encroachment in North American grasslands: shifts
in growth form dominance rapidly alters control of
ecosystem carbon inputs
A L A N K . K N A P P *, J O H N M . B R I G G S w, S C O T T L . C O L L I N S z, S T E V E N R . A R C H E R §,
M . S Y N D O N I A B R E T - H A R T E }, B R E N T E . E W E R Sk, D E B R A P. P E T E R S **, D O N A L D R .
Y O U N G ww, G A I U S R . S H AV E R zz, E L I S E P E N D A L Lk and M E A G A N B . C L E A R Yk
*Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523-1878, USA,
wSchool of Life Sciences, Arizona State University, Tempe, AZ 85287, USA, zDepartment of Biology, University of New Mexico,
Albuquerque, NM 87131, USA, §School of Natural Resources, University of Arizona, Tucson, AZ 85721, USA, }Institute of Arctic
Biology, University of Alaska, Fairbanks, AK 99775, USA, kDepartment of Botany, University of Wyoming, Laramie, WY 82071,
USA, **USDA, ARS, Jornada Experimental Range, New Mexico State University, Las Cruces, NM 88003, USA, wwDepartment of
Biology, Virginia Commonwealth University, Richmond, VA 23284, USA, zzMarine Biological Laboratory, The Ecosystems Center,
Woods Hole, MA 02543, USA
Shrub encroachment into grass-dominated biomes is occurring globally due to a variety
of anthropogenic activities, but the consequences for carbon (C) inputs, storage and
cycling remain unclear. We studied eight North American graminoid-dominated ecosys-
tems invaded by shrubs, from arctic tundra to Atlantic coastal dunes, to quantify patterns
and controls of C inputs via aboveground net primary production (ANPP). Across a
fourfold range in mean annual precipitation (MAP), a key regulator of ecosystem C input


Source: Archer, Steven R. - Savanna/Woodland Ecology Lab., School of Natural Resources and the Environment, University of Arizona
USDA, Jornada Experimental Range
Wagner, Diane - Institute of Arctic Biology, Department of Biology and Wildlife, University of Alaska Fairbanks


Collections: Environmental Sciences and Ecology