Root biomass, root distribution and the fine-root growth dynamics of Quercus coccifera L. in the garrigue of southern France
Identifieur interne : 000104 ( Istex/Curation ); précédent : 000103; suivant : 000105Root biomass, root distribution and the fine-root growth dynamics of Quercus coccifera L. in the garrigue of southern France
Auteurs : Jochen Kummerow [États-Unis] ; Margarete Kummerow [États-Unis] ; Louis Trabaud [France]Source :
- Vegetatio [ 0042-3106 ] ; 1990-05-01.
Abstract
Abstract: Quercus coccifera L., the characteristic scrub oak of the garrigue, covers more than 100,000 ha in southern France alone. Precipitation in this area averages 900 mm/year and summer rains are not rare. A total belowground biomass of 7.2 kg/m2, including rhizomes and lignotubers, was harvested. Roots were concentrated in the uppermost 50 cm of the soil. It was hypothesized that low winter temperatures inhibit active fine-root growth. This hypothesis was tested by means of fine-root extractions of soil samples from 0–50 cm depth from November 1987 to June 1988. Although the fine-root analysis could not be extended into late summer and fall, the data supported the hypothesis. Ratios of live/dead fine roots reached their minimum at 0.2–0.3 from December to April. They increased to 1.0–1.2 during late spring and early summer. Initiation of fine-root growth in early April was synchronous with bud break. Starch contents of roots, rhizomes, and lignotubers fluctuated from 4.3% in January to 8.3% in April. The starch stored in belowground organs of Q. coccifera in a closed canopy stand amounted to about 500 g/m2 in April. This amount declined to 400 g with bud burst and fine-root growth initiation.
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DOI: 10.1007/BF00045653
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California</wicri:regionArea></affiliation></author><author><name sortKey="Kummerow, Margarete" sort="Kummerow, Margarete" uniqKey="Kummerow M" first="Margarete" last="Kummerow">Margarete Kummerow</name><affiliation wicri:level="1"><mods:affiliation>Biology Department, San Diego State University, 92182, San Diego, California, U.S.A.</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Biology Department, San Diego State University, 92182, San Diego, California</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Systems Ecology Research Group, San Diego State University, 92182, San Diego, California, U.S.A.</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Systems Ecology Research Group, San Diego State University, 92182, San Diego, California</wicri:regionArea></affiliation></author><author><name sortKey="Trabaud, Louis" sort="Trabaud, Louis" uniqKey="Trabaud L" first="Louis" last="Trabaud">Louis 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Precipitation in this area averages 900 mm/year and summer rains are not rare. A total belowground biomass of 7.2 kg/m2, including rhizomes and lignotubers, was harvested. Roots were concentrated in the uppermost 50 cm of the soil. It was hypothesized that low winter temperatures inhibit active fine-root growth. This hypothesis was tested by means of fine-root extractions of soil samples from 0–50 cm depth from November 1987 to June 1988. Although the fine-root analysis could not be extended into late summer and fall, the data supported the hypothesis. Ratios of live/dead fine roots reached their minimum at 0.2–0.3 from December to April. They increased to 1.0–1.2 during late spring and early summer. Initiation of fine-root growth in early April was synchronous with bud break. Starch contents of roots, rhizomes, and lignotubers fluctuated from 4.3% in January to 8.3% in April. The starch stored in belowground organs of Q. coccifera in a closed canopy stand amounted to about 500 g/m2 in April. This amount declined to 400 g with bud burst and fine-root growth initiation.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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