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Nighttime Respiration Behavior of Kandelia Obovata Sheue Liu and Young from Subtropical Okinawa Island, Japan

AT M Rafiqul Hoque
Institute of Forestry and Environmental Sciences, University of Chittagong, Chitttagong-4331, Bangladesh.

S. Sharma
Graduate School of Eng. and Sci., Ryukyus University of the Okinawa 903-0213, Japan

S. Mori
Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan.

A. Hagihara
Faculty of Science, Ryukyus University of the Okinawa 903-0213, Japan.

Abstract/ Executive Summary:

Above ground nighttime respiration behavior of Kandelia obovata Sheue, Liu and Yong was measured from 10 sample plant growing in the mangroves of Okinawa Island, Japan. The independence of the respiration on the tree size was successfully represented by a power function of D_0.1H²H. the respiratory behavior of K. obovata was found dependent to size and the exponent was close to ¾. The size dependence of respiration could be successfully represented by a power function of D_0.1H²H.

Keywords: Carbon release, Enclosed standing-tree method, Kandelia, Obovata mangrove, Power function.

Location: The southern part of Okinawa Island, Japan.

Start Date: 01-05-2007

End Date: 30-07-2007

Program Area: Variety and Species

Commodity:

Objectives:

To determine the nighttime respiratory behavior of Kandelia obovata grown in natural mangrove conditions of subtropical Okinawa Island of Japan.

Methodology:

This study was carried out at Manko Wetland, located in the southern part of Okinawa Island, Japan (26°11' N and 127°40' E) and the site has been registered under the Ramsar Convention. The mean monthly minimum temperature is 17.3°C in January and maximum temperature is 28.9°C in July- August. Rainfall was over 100 mm month^-1 through out the year and the mean annual rainfall was 2227 mm year^-1. Ten sample plants of K. obovata of different sizes were selected for the measurement of nighttime respiration in the field. The respiration of the sample trees was measured on non-destructively method with an enclosed standing-tree. The aboveground parts of a sample tree were enclosed in a chamber of 0.1 or 0.2 mm thick polyvinyl chloride film. The skirt of the chamber was tied around the base of the stem and was well sealed with clay. The air in the chamber was mixed by a fan to keep CO₂ concentration uniform . Before starting measurement, leak test for 10 min was done to ensure the air tight of the chamber. C0₂ concentration within the closed air-circulation system was measured with an infrared gas analyzer every five seconds interval for maximum of 10 to 30 min. The measurement was carried out from May to July 2007. The mean air temperature inside the chamber during the measurement period was 27.8 ± 0.2 (SE)⁰C. Respiration rate r was calculated from the mean CO₂ increment in a chamber following the formula, r = V. 273.2 . . p. 1. ∆C / 273.2+0 . 1Ol3 . 22.4 ∆t.

Source of Information: Bangladesh Journal Of Forest Science, vol.31(1), (page no:74-78), Jan-Jun,2012, Chittagong.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The respiratory behavior of K. obovata was found clearly dependent to size. The size-dependence of respiration could be successfully represented by a power function of D_O.lH²H. The exponent was close to 3/4 for K. obovata, supported by Enquist-group's theoretical model. So, real mass measurement is prerequisite for estimation of stand respiration. Further respiration measurement on different growth conditions, and different seasons are needed for investigating long- term respiratory behavior in relation to environments.

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