Effects of different planting configurations and clones on biomass and carbon storage of a 12-year-old poplar ecosystem in southern China

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Artikel aus einer Zeitschrift

200209911

The main objective of this study was to compare the effects of two densities (278 stems·ha1 with two spacings of
6 m 6 m or 4.5 m 8 m, 400 stems·ha1 with two spacings of 5 m 5 m or 3 m 8 m) and three poplar clones (NL95,
NL895, and NL797) on productivity and carbon (C) sequestration of poplar ecosystems. The results showed that planting density significantly affected the biomass of a single tree. The mean tree biomass of clone NL95 was higher in all spacings than that of the other clones, with a significant difference for the 6 m 6 m spacing. The biomass of poplar trees ranged from 78.9 to 110.3 Mg·ha1, with the highest tree biomass observed in the square configuration. Soil C concentration (0–100 cm) increased after 12 years of management. Soil C storage ranged from 138.1 to 164.3 Mg C·ha1, and the highest soil C storage was in the NL797 poplar plantation with 6 m 6 m spacing. Our results suggested that clones NL95 and NL797 should be chosen for planting, with a planting density of 278 stems·ha1 and spacing of 6 m 6 m.
Key words: biomass production, C sequestration, plant density, plant spacing, poplar clone.