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Effects of atmospheric CO 2 enrichment on regrowth of sour orange trees ( C itrus aurantium ; Rutaceae) after coppicing
Author(s) -
Idso S. B.,
Kimball B. A.
Publication year - 1994
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1994.tb15565.x
Subject(s) - cutting , orange (colour) , horticulture , botany , rutaceae , biology , air temperature , coppicing , fruit tree , zoology , woody plant , atmospheric sciences , geology
Sixteen sour orange tree ( Citrus aurantium L.) seedlings were grown out‐of‐doors at Phoenix, Arizona, in eight clear‐plastic‐wall open‐top enclosures maintained at four different atmospheric CO 2 concentrations for a period of 2 years. Over the last year of this period, the trees were coppiced five times. The amount of dry matter harvested at each of these cuttings was a linear function of the atmospheric CO 2 concentration to which the trees were exposed. For a 75% increase in atmospheric CO, from 400 to 700 microliter per liter ( μL liter 1 ), total aboveground biomass rose, in the mean, by a factor of 3.19; while for a 400 to 800 μL liter 1 doubling of the air's CO 2 content, it rose by a factor of 3.92. The relative summer (mean air temperature of 32.8 C) response to CO 2 was about 20% greater than the relative winter (mean air temperature of 16.4 C) response.