Abstract

Authors

JOMURA Mayuko, KOMINAMI Yuji, DANNOURA Masako, KANAZAWA Yoichi

Year

2006

Title

Temperate Dependence of Heterotrophic Respiration Rate of Coarse Woody Debris -Influence of Measurement Depth on Evaluation of the Temperature Dependence-

Journal

Journal of Agricultural Meteorology

Volume

62(3)

Page

103-108

DOI

doi:10.2480/agrmet.62.103

Keywords

URL

http://www.jstage.jst.go.jp/article/agrmet/62/3/62_103/_article/-char/ja

Abstract

We measured CO₂ flux from coarse woody debris (CWD) of Pinus densiflora and Quercus serrata using automated chamber systems. To investigate temperature dependence of the respiration rate, we also monitored temperatures at four depths near and within the CWD. The respiration rate of two CWD samples showed clear diurnal variations, with maximum values measured in the afternoon (1400-1500 h). The CWD temperatures also showed clear diurnal variations, although the time when the peak value was observed and the variation range of the temperature varied with measurement depth, resulting in different relationships between respiration rate and temperature at different depths. Q₁₀ values calculated from the relationships varied about twice in magnitude depending on measurement depth, meaning that we must choose the appropriate depth to correctly evaluate temperature dependence. We assumed that the depth at which the r² value was the highest was suitable to evaluate the temperature- dependent function correctly. From this analysis, we obtained the best-fit depth of temperature for an accurate evaluation of CWD respiration sensitivity to temperature.

Site

YMS

Remarks

in Japanese with English abstract