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Effect of spacing on growth and biomass distribution in Eucalyptus camaldulensis, E. pellita and E. urophylla plantations in southeastern Brazil
Ist Teil von
Forest ecology and management, 1998-05, Vol.104 (1), p.1-13
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
1998
Link zum Volltext
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
The growth and biomass accumulation in different plant parts (including root systems) of
Eucalyptus camaldulensis,
E. urophylla and
E. pellita planted at three spacings (3×1.5 m, 3×3 m and 4×3 m) and three ages (15, 31 and 41 months) were evaluated in the savannah region of central Minas Gerais state in southeastern Brazil. A series of equations were produced to estimate per-tree biomass from age, spacing, diameter and height, and per-hectare biomass using age, spacing and a tally of tree diameters and heights. Average total productivity at age 41 months was of the order
E. urophylla>
E. pellita≥
E. camaldulensis. As spacing increased, individual stems increased in diameter and total biomass; however, total biomass production per hectare decreased.
Eucalyptus urophylla had 64.8 vs. 42.8,
E. pellita 41.3 vs. 28.9 and
E. camaldulensis 35.1 vs. 26.9 Mg ha
−1 at 3×1.5 vs. 4×3 m spacings, respectively. Increased spacing levels also decreased the relative amount of growth allocated to the bole of the tree for
E. urophylla and
E. camaldulensis during the time period of this study and increased allocation to the root system, while
E pellita showed relatively small changes. Allocation to the bolewood in
E. urophylla changed from 46 to 36%, in
E. camaldulensis from 37 to 32%, and
E. pellita from 31–34% at 3×1.5 vs. 4×3 m spacings, respectively. Allocation to the root system in
E. urophylla changed from 23–30%, in
E. camaldulensis from 34–45%, and
E. pellita from 37–33% at 3×1.5 vs. 4×3 m spacings, respectively. Thought these results show that some of the biomass changes from species, age and spacing differences are related to distribution, not total biomass production, there were significant differences in total biomass accumulation also. Since larger root systems may increase future yields from coppice growth, the effect of differences in allocation to the root system on future productivity needs to be evaluated.