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- Title
Increased CO<sub>2</sub> uncouples growth from isoprene emission in an agriforest ecosystem.
- Authors
Rosenstiel, Todd N.; Potosnak, Mark J.; Griffin, Kevin L.; Fall, Ray; Monson, Russell K.
- Abstract
The emission of isoprene from the leaves of forest trees is a fundamental component of biosphere-atmosphere interactions, controlling many aspects of photochemistry in the lower atmosphere[SUP1-3]. As almost all commercial agriforest species emit high levels of isoprene[SUP4], proliferation of agriforest plantations has significant potential to increase regional ozone pollution[SUP5-7] and enhance the lifetime of methane[SUP8], an important determinant of global climate. Here we show that growth of an intact Populus deltoides plantation under increased CO[SUB2] (800μmol mol[SUP-1] and 1,200μmol mol[SUP-1]) reduced ecosystem isoprene production by 21% and 41%, while above-ground biomass accumulation was enhanced by 60% and 82%, respectively. Exposure to increased CO[SUB2] significantly reduced the cellular content of dimethylallyl diphosphate, the substrate for isoprene synthesis, in both leaves and leaf protoplasts. We identify intracellular metabolic competition for phosphoenolpyruvate as a possible control point in explaining the suppression of isoprene emission under increased CO[SUB2]. Our results highlight the potential for uncoupling isoprene emission from biomass accumulation in an agriforest species, and show that negative air-quality effects of proliferating agriforests may be offset by increases in CO[SUB2].
- Subjects
ISOPRENE; BIOTIC communities; PHOTOCHEMISTRY; ATMOSPHERE
- Publication
Nature, 2003, Vol 421, Issue 6920, p256
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature01312