Abstract

Authors

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

Year

2003

Title

Charactreistics of CO₂ flux over a forest on complex topography

Journal

Tellus

Volume

55(B)

Page

313-321

DOI

10.1034/j.1600-0889.2003.00040.x

Keywords

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URL

http://www.blackwell-synergy.com/doi/abs/10.1034/j.1600-0889.2003.00040.x

Abstract

The CO₂ flux over a mixed forest of evergreen and deciduous broad-leaved trees on complex topography was measured by using an eddy covariance method. To evaluate the CO₂ flux over such a forest and to ascertain the effect of topography, the eddy covariance measurement was conducted at the top of each of two meteorological towers erected in a basin (1.6 ha). The CO₂ flux measured by the eddy covariance method was also evaluated by comparing it with the CO₂ flux from leaf photosynthesis and soil respiration as continuously measured by automatic chamber methods on the forest floor and in the foliage. The daily variations in the daytime CO₂ flux values measured at the two towers were each quite similar. However, for the night-time CO₂ flux values, there was about 36% difference between the towers, even though the flux was measured in the same basin. The CO₂ flux as measured by eddy covariance and including CO₂ storage change (F_n) was 60% lower than that estimated by the chamber methods (F_chm). The CO₂ flux as measured by using the relation between F_n and soil temperature at 2 cm depth obtained only under conditions of low stability (U* ≥ 0.25 m s^-1) was 32% lower than F_chm.

Site

YMS

Remarks

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