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Seasonal fine‐root biomass development of sour orange trees grown in atmospheres of ambient and elevated CO 2 concentration
Author(s) -
IDSO S. B.,
KIMBALL B. A.
Publication year - 1992
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1992.tb00982.x
Subject(s) - seedling , orange (colour) , biomass (ecology) , horticulture , environmental science , botany , agronomy , biology
Sour orange trees have been grown from the seedling stage out‐of‐doors at Phoenix, Arizona, USA, in open‐top enclosures with clear plastic walls for 3.5 years. For the last 3 years of this period, half of the trees have been continuously exposed to air enriched with CO 2 to 300 μmol mol −1 above the ambient concentration. At 2‐month intervals over the last 12 months, we have determined the fine‐root biomass in the top 0.4 m of the soil profile beneath the trees. Results from both treatments define a single relationship between fine‐root biomass and trunk cross‐sectional area. The data also show the CO 2 ‐enriched trees to have approximately 2.3 times more fine‐root biomass in this soil layer than the trees grown in ambient air.