Journal
NEW PHYTOLOGIST
Volume 231, Issue 3, Pages 974-986Publisher
WILEY
DOI: 10.1111/nph.17432
Keywords
belowground species interactions; drought; fine-root lifespan; fine-root production; minirhizotrons; temperate forests; vertical root distribution
Categories
Funding
- Cornell IGERT Cross-Scale Biogeochemistry and Climate Program
- Towards Sustainability Foundation
- Cornell Graduate School Research Travel Grant
- Mario Einaudi Research Travel Grant
- Cornell Society of Horticulture Travel Grant
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The study investigated the impact of drought on fine-root dynamics of European beech and Norway spruce using minirhizotron methods. It found that the fine-root production of both species decreased under drought, but intermixing them can alleviate the impact on Norway spruce. Additionally, species-specific responses to drought were observed.
Temperate forest ecosystems are exposed to a higher frequency, duration and severity of drought. To promote forest longevity in a changing climate, we require a better understanding of the long-term impacts of repetitive drought events on fine-root dynamics in mature forests. Using minirhizotron methods, we investigated the effect of seasonal drought on fine-root dynamics in single-species and mixed-species arrangements of Fagus sylvatica (European beech) and Picea abies (Norway spruce) by means of a 4-yr-long throughfall-exclusion experiment. Fine-root production of both species decreased under drought. However, this reduction was not evident for P. abies when grown intermixed with F. sylvatica. Throughfall-exclusion prolonged the lifespan of P. abies roots but did not change the lifespan of F. sylvatica roots, except in 2016. Fagus sylvatica responded to drought by reducing fine-root production at specific depths and during roof closure. This is the first study to examine long-term trends in mature forest fine-root dynamics under repetitive drought events. Species-specific fine-root responses to drought have implications for the rate and depth of root-derived organic matter supply to soil. From a root dynamics perspective, intermixing tree species is not beneficial to all species but dampens drought impacts on the belowground productivity of P. abies.
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