Abstract

Authors

Dannoura, M., Kominami, Y., Tamai, K., Goto, Y., Jomura, M., Kanazawa, Y.

Year

2006

Title

京都府南部広葉樹林において短期間に測定された根呼吸量の土壌呼吸量に対する寄与の評価
Short-term Evaluation of the Contribution of Root Respiration to Soil Respiration in a Broad-leaved Secondary Forest in the Southern Part of Kyoto Prefecture

Journal

Journal of agricultural meteorology

Volume

62(1)

Page

15-21

DOI

10.2480/agrmet.62.15

Keywords

根現存量, 根呼吸量, 土壌呼吸量
Root biomass, Root respiration, Soil respiration

URL

http://www.jstage.jst.go.jp/article/agrmet/62/1/62_15/_article/-char/ja/

Abstract

Root respiration was separated from total soil respiration in this study. Experiments were carried out in September 2003 at Yamashiro Experimental Forest located in Kyoto Prefecture. It is a secondary forest of broad-leaf trees including some conifer species. The root system was dug out and divided into several classes by size. The respiration rate of each size was measured by the closed-chamber method consisting of an IRGA, a pump, and a chamber made of acrylic. Temperature in the chamber was measured by thermo couple. The results showed that the smaller the diameter of the root was, the higher the respiration rate per unit weight was. A much higher rate was found in fine roots in comparison with other classes. From the relationships between basal diameter and root mass of each size for sample trees, root mass of each size per area was estimated. By combining the respiration rate and root mass of each size per area, root respiration could be calculated at 0.0707 mg CO2 m-2 s-1 as a total. More than the half was occupied by fine root respiration. Mean total soil respiration was 0.19 mg CO2 m-2 s-1 during this experiments. Therefore, the contribution of root respiration to soil respiration was estimated at 37.2%.

Site

YMS

Remarks

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