Nitrogen limitation in arid - subhumid ecosystems a meta - analysis of fertilization studies
Evidence supporting water limitation in arid-semiarid ecosystems includes strong correlations between aboveground net primary production [ANPP] and annual precipitation as well as results from experimental water additions. Similarly, there is evidence of N limitation on ANPP in low precipitation eco...
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2011Yahdjian.pdf LINK AL EDITOR |
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| 100 | 1 | |9 16176 |a Yahdjian, María Laura | |
| 245 | 0 | 0 | |a Nitrogen limitation in arid - subhumid ecosystems |b a meta - analysis of fertilization studies |
| 520 | |a Evidence supporting water limitation in arid-semiarid ecosystems includes strong correlations between aboveground net primary production [ANPP] and annual precipitation as well as results from experimental water additions. Similarly, there is evidence of N limitation on ANPP in low precipitation ecosystems, but is this a widespread phenomenon? Are all arid-semiarid ecosystems equally limited by nitrogen? Is the response of N fertilization modulated by water availability? We conducted a meta-analysis of ANPP responses to N fertilization across arid to subhumid ecosystems to quantify N limitation, using the effect-size index R which is the ratio of ANPP in fertilized to control plots. Nitrogen addition increased ANPP across all studies by an average of 50 percent, and nitrogen effects increased significantly [P = 0.03] along the 50-650 mm yr-1 precipitation gradient. The response ratio decreased with mean annual temperature in arid and semiarid ecosystems but was insensitive in subhumid systems. Sown pastures showed significant [P = 0.007] higher responses than natural ecosystems. Neither plant-life form nor chemical form of the applied fertilizer showed significant effects on the primary production response to N addition. Our results showed that nitrogen limitation is a widespread phenomenon in low-precipitation ecosystems and that its importance increases with annual precipitation from arid to subhumid regions. Both water and N availability limit primary production, probably at different times during the year; with frequency of N limitation increasing and frequency of water limitation decreasing as annual precipitation increases. Expected increase N deposition, which could be significant even in arid ecosystems, would increase aboveground net primary production in water-limited ecosystems that account for 40 percent of the terrestrial surface. | ||
| 653 | 0 | |a ARID ECOSYSTEMS | |
| 653 | 0 | |a META-ANALYSIS | |
| 653 | 0 | |a NITROGEN FERTILIZATION | |
| 653 | 0 | |a PRIMARY PRODUCTION | |
| 653 | 0 | |a RESOURCE LIMITATION | |
| 653 | 0 | |a ABOVEGROUND BIOMASS | |
| 653 | 0 | |a ARID ENVIRONMENT | |
| 653 | 0 | |a FERTILIZER APPLICATION | |
| 653 | 0 | |a HUMID ENVIRONMENT | |
| 653 | 0 | |a NET PRIMARY PRODUCTION | |
| 653 | 0 | |a NITROGEN | |
| 653 | 0 | |a NUTRIENT LIMITATION | |
| 653 | 0 | |a PASTURE | |
| 653 | 0 | |a PRECIPITATION INTENSITY | |
| 653 | 0 | |a RESOURCE SCARCITY | |
| 653 | 0 | |a TEMPERATURE EFFECT | |
| 653 | 0 | |a WATER AVAILABILITY | |
| 700 | 1 | |a Gherardi Arbizu, Laureano |9 22726 | |
| 700 | 1 | |9 21158 |a Sala, Osvaldo Esteban | |
| 773 | |t Journal of Arid Environments |g Vol.75, no.8 (2011), p.675-680 | ||
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| 900 | |a ^tNitrogen limitation in arid-subhumid ecosystems^sa meta-analysis of fertilization studies | ||
| 900 | |a ^aYahdjian^bL. | ||
| 900 | |a ^aGherardi^bL. | ||
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| 900 | |a ^aYahdjian^bL. | ||
| 900 | |a ^aGherardi^bL. A. | ||
| 900 | |a ^aSala^bO. E. | ||
| 900 | |a ^aYahdjian^bL.^tInstitute for Agricultural Plant Physiology and Ecology [IFEVA], CONICET, Department of Ecology, Faculty of Agronomy, University of Buenos Aires, Av San MartÃn 4453, Buenos Aires C1417DSE, Argentina | ||
| 900 | |a ^aGherardi^bL.^tSchool of Life Sciences, School of Sustainability, Arizona State University, Tempe, AZ, United States | ||
| 900 | |a ^aSala^bO.E. | ||
| 900 | |a ^tJournal of Arid Environments^cJ. Arid Environ. | ||
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| 900 | |a Vol. 75, no. 8 | ||
| 900 | |a 680 | ||
| 900 | |a ARID ECOSYSTEMS | ||
| 900 | |a META-ANALYSIS | ||
| 900 | |a NITROGEN FERTILIZATION | ||
| 900 | |a PRIMARY PRODUCTION | ||
| 900 | |a RESOURCE LIMITATION | ||
| 900 | |a ABOVEGROUND BIOMASS | ||
| 900 | |a ARID ENVIRONMENT | ||
| 900 | |a FERTILIZER APPLICATION | ||
| 900 | |a HUMID ENVIRONMENT | ||
| 900 | |a NET PRIMARY PRODUCTION | ||
| 900 | |a NITROGEN | ||
| 900 | |a NUTRIENT LIMITATION | ||
| 900 | |a PASTURE | ||
| 900 | |a PRECIPITATION INTENSITY | ||
| 900 | |a RESOURCE SCARCITY | ||
| 900 | |a TEMPERATURE EFFECT | ||
| 900 | |a WATER AVAILABILITY | ||
| 900 | |a Evidence supporting water limitation in arid-semiarid ecosystems includes strong correlations between aboveground net primary production [ANPP] and annual precipitation as well as results from experimental water additions. Similarly, there is evidence of N limitation on ANPP in low precipitation ecosystems, but is this a widespread phenomenon? Are all arid-semiarid ecosystems equally limited by nitrogen? Is the response of N fertilization modulated by water availability? We conducted a meta-analysis of ANPP responses to N fertilization across arid to subhumid ecosystems to quantify N limitation, using the effect-size index R which is the ratio of ANPP in fertilized to control plots. Nitrogen addition increased ANPP across all studies by an average of 50 percent, and nitrogen effects increased significantly [P = 0.03] along the 50-650 mm yr-1 precipitation gradient. The response ratio decreased with mean annual temperature in arid and semiarid ecosystems but was insensitive in subhumid systems. Sown pastures showed significant [P = 0.007] higher responses than natural ecosystems. Neither plant-life form nor chemical form of the applied fertilizer showed significant effects on the primary production response to N addition. Our results showed that nitrogen limitation is a widespread phenomenon in low-precipitation ecosystems and that its importance increases with annual precipitation from arid to subhumid regions. Both water and N availability limit primary production, probably at different times during the year; with frequency of N limitation increasing and frequency of water limitation decreasing as annual precipitation increases. Expected increase N deposition, which could be significant even in arid ecosystems, would increase aboveground net primary production in water-limited ecosystems that account for 40 percent of the terrestrial surface. | ||
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