On average, the values for HR, SW, HA, SA, and HMC show a decreasing trend as one moves upwards from the base of the tree (0.3 m), with the mean values for heartwood generally higher than those for sapwood.
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Heartwood/Sapwood Characteristics of <i>Populus euphratica</i> Oliv. Trunks and Their Relationship with Soil Physicochemical Properties in the Lower Tarim River, Northwest China.
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