Long-term response of a Mojave Desert winter annual plant community to a whole-ecosystem atmospheric CO2 manipulation (FACE)

Bibliographische Detailangaben
Veröffentlicht in:	Global change biology. - 1999. - 20(2014), 3 vom: 11. März, Seite 879-92
1. Verfasser:	Smith, Stanley D (VerfasserIn)
Weitere Verfasser:	Charlet, Therese N, Zitzer, Stephen F, Abella, Scott R, Vanier, Cheryl H, Huxman, Travis E
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2014
Zugriff auf das übergeordnete Werk:	Global change biology
Schlagworte:	Journal Article Research Support, U.S. Gov't, Non-P.H.S. Bromus Lepidium Mojave Desert desert annuals elevated CO2 free-air CO2 enrichment invasive species primary productivity mehr... seed bank Carbon Dioxide 142M471B3J

Beschreibung
Zusammenfassung:	© 2013 John Wiley & Sons Ltd. Desert annuals are a critically important component of desert communities and may be particularly responsive to increasing atmospheric (CO2 ) because of their high potential growth rates and flexible phenology. During the 10-year life of the Nevada Desert FACE (free-air CO2 enrichment) Facility, we evaluated the productivity, reproductive allocation, and community structure of annuals in response to long-term elevated (CO2 ) exposure. The dominant forb and grass species exhibited accelerated phenology, increased size, and higher reproduction at elevated (CO2 ) in a wet El Niño year near the beginning of the experiment. However, a multiyear dry cycle resulted in no increases in productivity or reproductive allocation for the remainder of the experiment. At the community level, early indications of increased dominance of the invasive Bromus rubens at elevated (CO2 ) gave way to an absence of Bromus in the community during a drought cycle, with a resurgence late in the experiment in response to higher rainfall and a corresponding high density of Bromus in a final soil seed bank analysis, particularly at elevated (CO2 ). This long-term experiment resulted in two primary conclusions: (i) elevated (CO2 ) does not increase productivity of annuals in most years; and (ii) relative stimulation of invasive grasses will likely depend on future precipitation, with a wetter climate favoring invasive grasses but currently predicted greater aridity favoring native dicots
Beschreibung:	Date Completed 16.09.2014 Date Revised 25.11.2016 published: Print-Electronic Citation Status MEDLINE
ISSN:	1365-2486
DOI:	10.1111/gcb.12411