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Rooting depth and soil moisture control Mediterranean woody seedling survival during drought
Author(s) -
PADILLA F. M.,
PUGNAIRE F. I.
Publication year - 2007
Publication title -
functional ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.272
H-Index - 154
eISSN - 1365-2435
pISSN - 0269-8463
DOI - 10.1111/j.1365-2435.2007.01267.x
Subject(s) - seedling , biology , mediterranean climate , water content , agronomy , desiccation , growing season , shoot , biomass (ecology) , population , soil water , root system , botany , ecology , demography , geotechnical engineering , sociology , engineering
Summary1 Seedling 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. 2 We 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. 3 We 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. 4 Access 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.