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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 (>1000gm-2) at high MAP, where shrub patches maintained extraordinarily high leaf area. Concurrently, the...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Global Change Biology,
LAI,
MAP,
Wiley-Blackwell,
aboveground net primary production,
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