Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 177, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2020.104135
Keywords
Climate change; Aridity; Nitrogen; Phosphorus; Potassium; Stoichiometry; Carbon stocks
Categories
Funding
- European Research Council Synergy grant [ERC-SyG2013-610028 IMBALANCE-P]
- Spanish Government [CGL2016-79835-P]
- Catalan Government [SGR 2017-1005]
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Aridity has increased in recent decades in the Mediterranean Basin and is projected to continue to increase in the coming decades. We studied the consequences of drought on the concentrations, stoichiometries and stocks of carbon (C), nitrogen (N), phosphorus (P) and potassium (K) in leaves, foliar litter of a three dominant woody species and soil of a Mediterranean montane holm oak forest where soil-water content was experimentally reduced (15 % lower than the control plots) for 15 years. Nitrogen stocks were lower in the drought plots than in the control plots (8.81 +/- 1.01 kg ha(-1) in the forest canopy and 856 +/- 120 kg ha(-1) in the 0-15 cm soil layer), thus representing 7 and 18 % lower N stocks in the canopy and soil respectively. delta N-15 was consistently higher under drought conditions in all samples, indicating a general loss of N. Foliar C and K stocks were also lower but to a lesser extent than N. Decreases in biomass and C and N stocks due to drought were smallest for the most dominant tall shrub, Phillyrea latifolia, so our results suggest a lower capacity of this forest to store C and nutrients but also substantial resulting changes in forest structure with increasing drought.
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