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

Shrub encroachment in North American grasslands: shifts in growth form dominance rapidly alters control of ecosystem carbon inputs. A.K. Knapp, Pendall, E., Cleary, M. B., Briggs, J., Collins, S. L., Archer, S. R., Bret-Harte, M. S., Ewers, B. E., Peters, D., Young, D. R., & Shaver, G. R. Global Change Biology, 2008.

Paper abstract bibtex

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 ecosystems 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 at the continental scale, shrub invasion decreased ANPP in xeric sites, but dramatically increased ANPP (\textgreater 1000 g m(-2)) at high MAP, where shrub patches maintained extraordinarily high leaf area. Concurrently, the relationship between MAP and ANPP shifted from being nonlinear in grasslands to linear in shrublands. Thus, relatively abrupt (\textless 50 years) shifts in growth form dominance, without changes in resource quantity, can fundamentally alter continental-scale pattern of C inputs and their control by MAP in ways that exceed the direct effects of climate change alone.

@article{a.k._knapp_shrub_2008,
	title = {Shrub encroachment in {North} {American} grasslands: shifts in growth form dominance rapidly alters control of ecosystem carbon inputs},
	volume = {14},
	url = {://000252929900014},
	abstract = {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 ecosystems 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 at the continental scale, shrub invasion decreased ANPP in xeric sites, but dramatically increased ANPP ({\textgreater} 1000 g m(-2)) at high MAP, where shrub patches maintained extraordinarily high leaf area. Concurrently, the relationship between MAP and ANPP shifted from being nonlinear in grasslands to linear in shrublands. Thus, relatively abrupt ({\textless} 50 years) shifts in growth form dominance, without changes in resource quantity, can fundamentally alter continental-scale pattern of C inputs and their control by MAP in ways that exceed the direct effects of climate change alone.},
	number = {3},
	journal = {Global Change Biology},
	author = {{A.K. Knapp} and Pendall, E. and Cleary, M. B. and Briggs, J.M. and Collins, S. L. and Archer, S. R. and Bret-Harte, M. S. and Ewers, B. E. and Peters, D.P. and Young, D. R. and Shaver, G. R.},
	year = {2008},
	keywords = {JRN, KNZ, SEV, SGS, VCR, aboveground net primary production, aboveground primary production, carbon, chihuahuan desert, climate change, grasslands, growth form, lai, land-use, map, mesic grassland, net primary productivity, nitrogen pools, shrublands, shrublands leaf-area index, temporal dynamics, united-states, woody plant encroachment}
}

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