Journal Article

Changes in the relationship between tree size and aboveground respiration in field-grown hinoki cypress (<i>Chamaecyparis obtusa</i>) trees over three years

Taketo Yokota and Akio Hagihara

in Tree Physiology

Volume 18, issue 1, pages 37-43
Published in print January 1998 | ISSN: 0829-318X
Published online January 1998 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/18.1.37
Changes in the relationship between tree size and aboveground respiration in field-grown hinoki cypress (Chamaecyparis obtusa) trees over three years

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Respiration measurements of aerial parts of 18-year-old hinoki cypress (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.) trees were made under field conditions over three years to study changing relationships with tree age between respiration and phytomass, phytomass increment, and leaf mass. The relationship between annual respiration (ra) and phytomass (wT) was approximated by a proportional function (ra = awT), where the proportional constant (a) decreased year by year. The effect of time on the relationship between annual respiration and phytomass of each sample tree was fitted by a power function. Respiration of the tree suppressed by the canopy decreased year by year, but respiration of the other trees increased slightly with age. The relationship between annual respiration and leaf mass was also approximated by a generalized power function. Excluding the suppressed tree, the relationship between annual respiration (ra) and the annual increment of aboveground phytomass (ΔwT) was described by a proportional function (ra = 2.27ΔwT), where the proportional constant, 2.27, was independent of sample tree and year, indicating that about 2.3 times of the annual aboveground phytomass increment equivalent was respired annually. For any tree, the time constant relationships between annual respiration and leaf mass and phytomass increment for different-sized trees were similar to the corresponding time continuum relationships. In contrast, the time continuum relationship between annual respiration and phytomass differed from the time constant relationship, indicating that respiration of less active woody tissue contributed significantly to aboveground respiration. Based on the relationship between tree size and annual respiration, annual aboveground stand respiration was estimated to be 25.0, 26.9, and 25.8 Mgdm ha−1 year−1 for the three consecutive years, respectively, and the corresponding aboveground stand biomass was 60.0, 69.0, and 76.8 Mgdm ha−1.

Keywords: phytomass; phytomass increment; size dependence; stand respiration; suppressed tree; time constant relationships; time continuum relationships

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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