Effects of Elevated CO_2 Concentration on the Respiratory Behavior of the Branches of Field-Grown Hinoki Cypress (Chamaecyparis obtusa)

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概要

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• The effects of elevated atmospheric CO_2 concentrations on the nighttime respiration were examined for two sample branches of a hinoki cypress tree (Chamaecyparis obtusa) growing in the field with an open gas exchange system for a one-year period from July 1994 to June 1995. The branches were of a similar size and located at a similar position within the crown. One branch was subjected to an elevated CO_2 concentration of 800 μmol mol^<-1> and the other was subjected to ambient air which had a CO_2 concentration of about 370 μmol mol^<-1>. Nighttime respiration rate was higher in elevated CO_2 level than in ambient CO_2 level. The relationship between nighttime respiration and the corresponding nighttime air temperature was fitted by the exponential function in every month of the year. The segregation of regression lines between the two CO_2 treatments increased gradually as the seasons progressed during the treatment period. The Q_<10> values for nighttime respiration were lower in elevated CO_2 (1.9〓Q_<10>〓3.7) than in ambient CO_2 (2.4〓Q_<10>〓4.5) in every month of the year. The Q_<10> was inversely related to the monthly mean nighttime air temperature in both elevated and ambient CO_2. The estimated daily nighttime respiration rate under both CO_2 treatments had a similar seasonal pattern, which almost synchronized with the temperature change. The respiration ratio of elevated CO_2 to ambient CO_2 increased gradually from 1.1 to 1.6 until the end of the experiment. Our results indicate that the CO_2 level and the temperature have a strong interactive effect on respiration and suggest that a potential increase in respiration of branches will occur when ambient CO_2 increases.

• 一般社団法人日本森林学会の論文
• 1999-05-16

著者

• HAGIHARA Akio

  Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus

• Hagihara A

  Univ. Ryukyus Okinawa Jpn

• Hagihara A

  Univ. The Ryukyus Okinawa Jpn

• Hagihara Akio

  Forest Ecophysiology Laboratory Forest Sciences Division School Of Agricultural Sciences Nagoya Univ

• Hagihara Akio

  Laboratory Of Ecology And Systematic Faculty Of Science University Of The Ryukyus

• Ogawa Kazuharu

  Laboratory Of Forest Ecology And Physiology Graduate School Of Bioagricultural Sciences Nagoya Unive

• Ogawa K

  Laboratory Of Forest Ecology And Physiology School Of Agricultural Sciences Nagoya University

• Ogawa Kazuharu

  Laboratory Of Forest Ecology And Physiology Graduate School Of Bioagricultural Science Nagoya Univer

• Nagy Miklos

  Laboratory of Forest Ecology and Physiology, School of Agricultural Sciences, Nagoya University

• Nagy Miklos

  Laboratory Of Forest Ecology And Physiology School Of Agricultural Sciences Nagoya University

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