Journal Article

Carbon balance of the aerial parts of a young hinoki cypress (<i>Chamaecyparis obtusa</i>) stand

Stephen Adu-Bredu, Taketo Yokota and Akio Hagihara

in Tree Physiology

Volume 16, issue 1-2, pages 239-245
Published in print January 1996 | ISSN: 0829-318X
e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/16.1-2.239
Carbon balance of the aerial parts of a young hinoki cypress (Chamaecyparis obtusa) stand

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The aerial carbon balance of a 9-year-old hinoki cypress (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.) stand with an aerial biomass of 24.6 MgDW ha−1 was studied over a 1-year period. Various components that constitute gross production were measured on the basis of the summation method. Respiration of the aerial parts of six sample trees was measured at monthly intervals by an enclosed standing-tree method. The aerial respiration of sample trees was partitioned into growth and maintenance respiration by a two-component model. The growth coefficient varied between 1.2791 and 1.7957 g CO2 gDW−1 giving a mean value of 1.5223 ± 0.0729 (SE) g CO2 gDW−1, whereas the maintenance coefficient ranged between 0.0200 and 0.0373 g CO2 gDW−1 month−1 with a mean value of 0.0299 ± 0.0031 (SE) g CO2 gDW−1 month−1. Growth and maintenance respiration of the stand were estimated to be 8.62 and 10.52 Mg CO2 ha−1 year−1, respectively. An open-top cloth trap method was employed to measure the death of the parts of five sample trees. The death of leaves and total organs in the stand were assessed to be 6.26 and 7.60 MgDW ha−1 year−1, respectively. Tree mortality and biomass increment were 1.47 and 4.64 MgDW ha−1 year−1, respectively. In terms of carbon, respiration, death, grazing and biomass increment were equivalent to 5.22, 4.53, 0.04 and 2.32 Mg C ha−1 year−1, respectively. Net production and gross production were estimated to be 6.89 and 12.11 Mg C ha−1 year−1, respectively. Biomass accumulation ratio (biomass/net production) and overall efficiency (net production/gross production) were 1.8 and 0.57, respectively.

Keywords: biomass increment; grazing; gross production; growth respiration; maintenance respiration; net production

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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