Soil respiration rate on the contrasting north- and south-facing slopes of a larch forest in central Siberia [Russian Federation]
2000
Yanagihara, Y. (Hokkaido Univ., Sapporo (Japan)) | Koike, T. | Matsuura, Y. | Mori, S. | Shibata, H. | Satoh, F. | Masuyagina, O.V. | Zyryanova, O.A. | Prokushkin, A.S. | Prokushkin, S.G. | Abaimov, A.P.
In an attempt to evaluate global warming effects, we measured the soil respiration of the contrasting north- and south- facing slopes of a larch forest in central Siberia, located at Tura City in the Krasnoyarsk District, Russia. The north-facing slope is assumed to be the present condition while the south-facing slope may stand for the future warm condition. As a result of differences in solar radiation, there were clear differences between the north- and south- facing slopes in terms, for example, of the active layer as the growth rate of larch trees. The soil respiration rate was higher on the south-facing slope than on the north-facing slope. At the temperature of 15degC, soil respiration rate of the south-facing slope was ca. 6.2 micro molCO2.m**-2s**-1, which was about 0.6 times lower than that of broad-leaved forests in Hokkaido. There was an exponential correlation between soil temperature at 10 cm depth and the efflux of CO2 from the soil surface. Various conditions (soil temperature,. nitrogen content and soil water content) seemed to be more favorable for soil respiration on the south-facing slope.
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