Frequency and Extent of Water Limitation to Primary Production in a Mesic Temperate Grassland

Frequency and Extent of Water Limitation to Primary Production in a Mesic Temperate Grassland

The frequency and extent of water limitation to aboveground net primary production (ANPP) in a mesic grassland in NE Kansas (Konza Prairie, USA) was assessed with an 8-year irrigation experiment. Since 1991, transects spanning upland and lowland sites in annually burned, ungrazed tallgrass prairie w...

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Veröffentlicht in:Ecosystems. - Springer Science + Business Media. - 4(2001), 1, Seite 19-28
1. Verfasser: Knapp, A. K. (VerfasserIn)
Weitere Verfasser: Briggs, J. M., Koelliker, J. K.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2001
Zugriff auf das übergeordnete Werk:Ecosystems
Schlagworte:Andropogon gerardii C4grasses Forbs Grassland Irrigation Leaf water potential Primary production Tallgrass prairie Water limitation Biological sciences mehr... Physical sciences Environmental studies
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520 |a The frequency and extent of water limitation to aboveground net primary production (ANPP) in a mesic grassland in NE Kansas (Konza Prairie, USA) was assessed with an 8-year irrigation experiment. Since 1991, transects spanning upland and lowland sites in annually burned, ungrazed tallgrass prairie were provided with supplemental water to satisfy evapotranspirational demands. This protocol minimized water limitations during the growing season, as well as interannual variability in water stress. Irrigation of this mesic grassland increased ANPP in 6 of 8 years by an average of 26% when compared to control transects. Although interannual variation in ANPP was greater in uplands than lowlands at nominal levels of precipitation, reducing interannual variability in water availability via irrigation eliminated topographic differences; the irrigation protocol also reduced interannual variability in ANPP by as much as 40%. The addition of supplemental water enabled us to extend the relationship between annual precipitation and ANPP in grasslands to precipitation levels (average, 1153 mm; maximum, 1346 mm) similar to those experienced by more mesic grasslands that today exist only as remnants several hundred kilometers east of Kansas. This relationship was linear $(r^{2}=0.81)$ , with maximum ANPP $(738\ {\rm g}/{\rm m}^{2})$ similar to values reported for sites in Illinois and Wisconsin. After 8 years of irrigation, production of the C3forb component was twice that in control sites. These results indicate that water limitations in grasslands at the western edge of the presettlement extent of tall-grass prairie affect ANPP in most years and that this high frequency of water limitation may lead to greater dominance of the C4grasses than is seen in more eastern grassland sites. 
540 |a Copyright 2001 Springer-Verlag New York Inc. 
650 4 |a Andropogon gerardii 
650 4 |a C4grasses 
650 4 |a Forbs 
650 4 |a Grassland 
650 4 |a Irrigation 
650 4 |a Leaf water potential 
650 4 |a Primary production 
650 4 |a Tallgrass prairie 
650 4 |a Water limitation 
650 4 |a Biological sciences  |x Ecology  |x Ecosystems  |x Biomes  |x Grasslands  |x Prairies  |x Tallgrass prairies 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Topography  |x Highlands 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Topography  |x Lowlands 
650 4 |a Physical sciences  |x Earth sciences  |x Hydrology  |x Water resources  |x Water supply  |x Irrigation water 
650 4 |a Biological sciences  |x Ecology  |x Ecosystems  |x Biomes  |x Grasslands  |x Prairies 
650 4 |a Environmental studies  |x Atmospheric sciences  |x Meteorology  |x Hydrometeorology  |x Precipitation 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plants  |x Vascular plants  |x Angiosperms  |x Forbs 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agrology  |x Irrigation 
650 4 |a Biological sciences  |x Ecology  |x Ecosystems  |x Biomes  |x Grasslands 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plants  |x Grasses 
655 4 |a research-article 
700 1 |a Briggs, J. M.  |e verfasserin  |4 aut 
700 1 |a Koelliker, J. K.  |e verfasserin  |4 aut 
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