Abstract

Authors

Miyama, T., Kominami, Y., Tamai, K., Nobuhiro, T., Goto, Y.

Year

2003

Title

Automated foliage chamber method for long-term measurement of CO₂ flux in the uppermost canopy

Journal

Tellus

Volume

55(B)

Page

322-330

DOI

-

Keywords

-

URL

-

Abstract

Direct monitoring of CO₂ exchange in forest ecosystems is necessary for evalution of the annual net CO₂ flux. We developed an automated foliage chamber system for long-term in situ measurement of the CO₂ flux in foliage. The chamber closes automatically for 5 min in every 30. We found a high correlation between the photosynthesis rates measured by this system and by a portable H₂O/CO₂ analyzer (LCA-3,ADC). We used the new system to continuously monitor the CO₂ flux in foliage of Quercus serrata. There was a positive correlation between CO₂ flux and short-wave radiation. The daily photosynthesis rate varied widely depending on the environmental conditions. It increased from May to July and decreased temporarily in August. The seasonal pattern of photosynthesis was almost the same as that measured by the eddy covariance method. These results suggest that the new system is effective for tracking long-term seasonal change of the CO₂ flux in foliage.

Site

YMS

Remarks

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