Changes in ecosystem water consumption and hydrological processes following ecosystem alterations are important for environmental management and regional water supply. In this study on relatively dry days, the temporal dynamics of diurnal soil water contents at different soil depths were investigated within five adjacent ecosystems (primary forest and four ecosystems changed from the primary forest after human disturbance – clear-cut, grassland, shrub and secondary forest) at the altitude around 700 m a.s.l. at Changbai Mountain in Northeast China. On July 17, 2001 the diurnal water loss in the clear-cut was the highest among the five ecosystems and reached about 3.74 ¥ 10⁵ kg ha⁻¹, and it was lowest and about 1.07 ¥ 10⁵ kg ha⁻¹ in the primary forest of mixed broadleaved Korean pine forest. The temporal dynamics of soil water contents at different depths in the studied ecosystems were complicated but there were some common characteristics. First, soil water contents were higher at soil surface (about 0–10 cm) and then decreased with the soil depths. Second, soil moisture fluctuations were most rapid in the depths of 0–10 cm and 10–20 cm, and were comparatively slow and more moderate at the greater depths. The spatial and temporal changes of soil water content might be related with aboveground plants. Therefore, after the primary forest was converted to other ecosystems the hydrological characteristics of the ecosystem were changed, which would potentially affect regional hydrological processes.
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