Ecophysiological plasticity of Amazonian trees to long-term drought

Episodic multi-year droughts fundamentally alter the dynamics, functioning, and structure of Amazonian forests. However, the capacity of individual plant species to withstand intense drought regimes remains unclear. Here, we evaluated ecophysiological responses from a forest community where we sampl...

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Vydané v:	Oecologia Ročník 187; číslo 4; s. 933 - 940
Hlavní autori:	Domingues, Tomas Ferreira, Ometto, Jean Pierre Henry Balbaud, Nepstad, Daniel C., Brando, Paulo M., Martinelli, Luiz Antonio, Ehleringer, James R.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Berlin/Heidelberg Springer Science + Business Media 01.08.2018 Springer Berlin Heidelberg Springer Springer Nature B.V
Predmet:	Acclimation Acclimatization Biomedical and Life Sciences canopy Capacity carbon carbon nitrogen ratio climate Communities Drought Dynamics Ecology Ecophysiology Flora Flowers & plants Forest communities Forests Hydrology/Water Resources Investment Leaves Life Sciences Metabolites Nitrogen nitrogen content Photosynthesis Plant biochemistry Plant cover Plant Sciences Plant species Plants Plastic properties Plasticity Ratios Secondary metabolites SPECIAL TOPIC Species stable isotopes Statistical analysis Throughfall trees Uptake Water use water use efficiency Woody plants Nutrient Stable isotope Primary productivity Global change Functional group
ISSN:	0029-8549, 1432-1939, 1432-1939
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Shrnutí:	Episodic multi-year droughts fundamentally alter the dynamics, functioning, and structure of Amazonian forests. However, the capacity of individual plant species to withstand intense drought regimes remains unclear. Here, we evaluated ecophysiological responses from a forest community where we sampled 83 woody plant species during 5 years of experimental drought (throughfall exclusion) in an eastern Amazonian terra firme forest. Overall, the experimental drought resulted in shifts of some, but not all, leaf traits related to photosynthetic carbon uptake and intrinsic water-use efficiency. Leaf δ¹³C values increased by 2–3‰ within the canopy, consistent with increased diffusional constraints on photosynthesis. Decreased leaf C:N ratios were also observed, consistent with lower investments in leaf structure. However, no statistically significant treatment effects on leaf nitrogen content were observed, consistent with a lack of acclimation in photosynthetic capacity or increased production of nitrogen-based secondary metabolites. The results of our study provide evidence of robust acclimation potential to drought intensification in the diverse flora of an Amazonian forest community. The results reveals considerable ability of several species to respond to intense drought and challenge commonly held perspectives that this flora has attained limited adaptive plasticity because of a long evolutionary history in a favorable and stable climate.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0029-8549 1432-1939 1432-1939
DOI:	10.1007/s00442-018-4195-2