Water use efficiency (WUE) is an objective indicator of plant water use, the research of which is helpful to understand the carbon-water coupling mechanism in terrestrial ecosystems. We investigated WUE of dominant tree species in the succession series of broad-leaved Korean pine forests in Changbai Mountain (middle-aged poplar-birch secondary forest, mature poplar-birch secondary forest, broad-leaved Korean pine forest) by using stable carbon isotope technology. The WUE of three forests under different succession stages decreased in order of broad-leaved Korean pine forest > middle-aged poplar-birch secondary forest > mature poplar-birch secondary forest. In addition, the same tree species had different WUE in different forest stands. The WUE of and in the middle-aged poplar-birch secondary forest was higher than that in mature poplar-birch secondary forest. The WUE of in broad-leaved Korean pine forest was much higher than that in middle-aged poplar-birch secondary forest. The WUE of and in broad-leaved Korean pine forest was higher than that in mature poplar-birch secondary forest. The dominant tree species had different WUE as for wood types which generally presented ring-porous wood species>diffuse-porous wood species. There were different seasonal trends during the growing season among the dominant species in the broad-leaved Korean pine forest. The WUE of , , and showed first decreasing and then increasing, while that of was opposite. The WUE of the broad-leaved Korean pine forest was negatively correlated with temperature in the growing season. The different WUE was one of the strategies for dominant species in the broad-leaved Korean pine forest in Changbai Mountains to adapt to the community succession and respond to climate and environmental change.
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