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Titolo:
Frequency and extent of water limitation to primary production in a mesic temperate grassland
Autore:
Knapp, AK; Briggs, JM; Koelliker, JK;
Indirizzi:
Kansas State Univ, Div Biol, Manhattan, KS 66506 USA Kansas State Univ Manhattan KS USA 66506 iv Biol, Manhattan, KS 66506 USA Kansas State Univ, Dept Biol & Agr Engn, Manhattan, KS 66506 USA Kansas State Univ Manhattan KS USA 66506 gr Engn, Manhattan, KS 66506 USA
Titolo Testata:
ECOSYSTEMS
fascicolo: 1, volume: 4, anno: 2001,
pagine: 19 - 28
SICI:
1432-9840(200101/02)4:1<19:FAEOWL>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
TALLGRASS PRAIRIE; COMMUNITY STRUCTURE; NORTH-AMERICA; UNITED-STATES; C-4 GRASS; BIOMASS; NITROGEN; PRECIPITATION; DETERMINANTS; VARIABILITY;
Keywords:
Andropogon gerardii; C-4 grasses; forbs; grassland; irrigation; leaf water potential; primary production; tallgrass prairie; water limitation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Knapp, AK Kansas State Univ, Div Biol, Ackert Hall, Manhattan, KS 66506 USA Kansas State Univ Ackert Hall Manhattan KS USA 66506 S 66506 USA
Citazione:
A.K. Knapp et al., "Frequency and extent of water limitation to primary production in a mesic temperate grassland", ECOSYSTEMS, 4(1), 2001, pp. 19-28

Abstract

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, aswell as interannual variability in water stress. Irrigation of this mesic grassland increased ANPP in 6 of 8 years by an average of 26% when comparedto 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 tothose 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 g/m(2)) similar to values reported for sites in Illinois and Wisconsin. After 8 years of irrigation, production of the C-3 forb component was twice that in control sites. These results indicate that water limitations in grasslands at the western edge of the presettlement extent of tallgrass prairie affect ANPP in most years and that this high frequency of water limitation may lead to greater dominance of the C-4 grasses than is seen in more eastern grassland sites.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 12:49:02