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http://dx.doi.org/10.5532/KJAFM.2009.11.4.247

Experimental Estimation of the Effect of Rainfall Interception on Soil Respiration in a Broad-leaved Deciduous Forest in Western Japan  

Tamai, Koji (Forestry & Forest Products Research Institute)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.11, no.4, 2009 , pp. 247-251 More about this Journal
Abstract
To estimate the effect of rainfall on soil respiration, soil $CO_2$ efflux was measured with a manipulation of rainfall interception at a broad-leaved deciduous forest in western Japan from 20 February to 19 November 2001. The diurnal patterns of soil respiration observed at the intercepted subplot ($F_c$) were quite similar to those of soil temperature at 0.2 m depth with a maximum around midnight and a minimum from noon to early afternoon. Such diurnal patterns have not been observed in the previous studies at the same study site under natural conditions (which manifested no clear diurnal variations). Furthermore, the magnitudes of $F_c$ showed substantial differences (e.g., ~50% reduction under water-limited conditions) compared to those of the potential soil respiration under natural conditions ($F_{cal}$). These findings demonstrate that rainfall events not only affected the magnitude of soil $CO_2$ efflux but also modified the vertical structure of soil temperature, thereby altering diurnal patterns of soil respiration.
Keywords
Soil respiration; Rainfall; Soil temperature; Soil moisture; Deciduous forest;
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