NitroEurope - or NEU for short - is a project for integrated European research into the nitrogen cycle. NitroEurope is part of the EU's Sixth Framework Programme for Research and Technological Development, and will run for 5 years from February 2006 until 2011.
Warming and drought alter C and N concentration, allocation and accumulation in a Mediterranean shrubland
Fri, 31/10/2008 - 17:03 — penuelas
Publication Type:
Journal Paper (published)Source:
Global Change Biology, Volume 14, p.2304-2316 (2008)Keywords:
C/N, Climate change, Dorycnium pentaphyllum, Drought, Erica multiflora, Globularia alypum, Mediterranean shrubland, N, NUE, WarmingAbstract:
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<p align="left">We investigated the effects of warming and drought on C and N concentrations, nitrogen use efficiency (NUE), and C and N accumulation in different ecosystem compartments. We conducted a 6-year (1999–2005) field experiment to simulate the climate conditions projected by IPCC models for the coming decades in a Mediterranean shrubland. We studied the two dominant species,</p>
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<p align="left"><span style="font-size: small; font-family: AdvPalBI;">Globularia alypum </span><span style="font-size: small; font-family: AdvPalB;">and </span><span style="font-size: small; font-family: AdvPalBI;">Erica multiflora</span><span style="font-size: small; font-family: AdvPalB;">, and an N-fixing species, </span><span style="font-size: small; font-family: AdvPalBI;">Dorycniumpentaphyllum</span><span style="font-size: small; font-family: AdvPalB;">, also abundant in this shrubland. Warming (1 º</span><span style="font-size: small; font-family: AdvPalB;">C) decreased N leaf concentrations by 25% and increased N stem concentrations by 40% in </span><span style="font-size: small; font-family: AdvPalBI;">G. alypum</span><span style="font-size: small; font-family: AdvPalB;">. Although warming changed the available ammonium in soil in some seasons, it did not increase total soil N contents. Drought (19% average reduction in soil moisture) decreased leaf N concentrations in the two dominant shrub species, </span><span style="font-size: small; font-family: AdvPalBI;">E</span><span style="font-size: small; font-family: AdvPalB;">. </span><span style="font-size: small; font-family: AdvPalBI;">multiflora </span><span style="font-size: small; font-family: AdvPalB;">and </span><span style="font-size: small; font-family: AdvPalBI;">G. alypum </span><span style="font-size: small; font-family: AdvPalB;">by 16% and 19%, respectively, and increased stem N concentrations by 56% and 40%, respectively. Neither warming nor drought changed the leaf N concentrations in the N-fixing species </span><span style="font-size: small; font-family: AdvPalBI;">D. pentaphyllum</span><span style="font-size: small; font-family: AdvPalB;">, although warming increased stem N concentration by 9%. In </span><span style="font-size: small; font-family: AdvPalBI;">G. alypum</span><span style="font-size: small; font-family: AdvPalB;">, the increase of stem N concentrations contributed to the observed increase of N accumulation in stem biomass in drought treatments with respect to control plots (8 kgNha</span><span style="font-size: small; font-family: AdvPalB;">). Neither warming nor drought changed NUE in the period 1999–2005.</span></p>
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NitroEuropeIP is coordinated by The Centre For Ecology and Hydrology.
