科研之友
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摘要
Understanding how drought affects seeder and resprouter plants during post-fire regeneration is important for the anticipation of Mediterranean vegetation vulnerability in a context of increasing drought and fire caused by climate change. A Mediterranean shrubland was subjected to various drought treatments (including 45% rainfall reduction, 7 months drought yr(-1)), before and after experimental burning, by means of a rainout-shelter system with an irrigation facility. Predawn shoot water potential (Psi(pd)), relative growth rate (RGR), specific leaf area (SLA) and bulk leaf carbon isotopic composition (delta C-13) were monitored in the main woody species during the first 3 yr after fire. Cistus ladanifer seedlings showed higher Psi(pd), RGR and SLA, and lower delta C-13, than unburned plants during the first two post-fire years. Seedlings under drought maintained relatively high Psi(pd), but suffered a decrease in Psi(pd) and RGR, and an increase in delta C-13, relative to control treatments. Erica arborea, E. scoparia and Phillyrea angustifolia resprouts had higher Psi(pd) and RGR than unburned plants during the first post-fire year. Resprouters were largely unaffected by drought. Overall, despite marked differences between the two functional groups, post-fire environments were favourable for plant functioning of both seeder and resprouter shrubs, even under the most severe drought conditions implemented.
- 出版日期2017-5
