Rooting depth and soil moisture control Mediterranean woody seedling survival during drought
Article first published online: 14 MAY 2007
Volume 21, Issue 3, pages 489–495, June 2007
How to Cite
PADILLA, F. M. and PUGNAIRE, F. I. (2007), Rooting depth and soil moisture control Mediterranean woody seedling survival during drought. Functional Ecology, 21: 489–495. doi: 10.1111/j.1365-2435.2007.01267.x
- Issue published online: 14 MAY 2007
- Article first published online: 14 MAY 2007
- Received 8 November 2006; revised 30 January 2007; accepted 20 February 2007; Editor: Scott Wilson
- soil water;
- Mediterranean species;
- root growth
- 1Seedling survival is one of the most critical stages in a plant's life history, and is often reduced by drought and soil desiccation. It has been hypothesized that root systems accessing moist soil layers are critical for establishment, but very little is known about seedling root growth and traits in the field.
- 2We related seedling mortality to the presence of deep roots in a field experiment in which we monitored soil moisture, root growth and seedling survival in five Mediterranean woody species from the beginning of the growing season until the end of the drought season.
- 3We found strong positive relationships between survival and maximum rooting depth, as well as between survival and soil moisture. Species with roots in moist soil layers withstood prolonged drought better, whereas species with shallow roots died more frequently. In contrast, biomass allocation to roots was not related to establishment success.
- 4Access to moist soil horizons accounted for species-specific survival rates, whereas large root : shoot (R:S) ratios did not. The existence of soil moisture thresholds that control establishment provides insights into plant population dynamics in dry environments.