Fertilization in Eucalyptus urophylla plantations in Guangxi, southern China
StoraEnso decided in year 2002 to build a pulp mill in the province of Guangxi, southern China, and also establish eucalyptus plantations to provide it with raw material. By 2010 StoraEnso controls about 90 000 of planned 120 000 ha, out of 75 000 ha is already planted with Eucalyptus. By using bett...
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| Formato: | Second cycle, A1E |
| Lenguaje: | sueco Inglés |
| Publicado: |
2011
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| Acceso en línea: | https://stud.epsilon.slu.se/3294/ |
| Sumario: | StoraEnso decided in year 2002 to build a pulp mill in the province of Guangxi, southern
China, and also establish eucalyptus plantations to provide it with raw material. By 2010
StoraEnso controls about 90 000 of planned 120 000 ha, out of 75 000 ha is already planted
with Eucalyptus.
By using better genetic material, improve the tending, selecting the sites more careful and by
using a proper fertilization regime StoraEnso hopes to increase the mean annual increment
from today’s 25 m3/ha, on bark, to 35 m3/ha. This study is one part in this work to increase the
mean annual increment in the plantation.
This master thesis is the forth in a series, that has followed up a fertilization trial that started
in spring 2006 when the trial was laid out and treatments decided. The aim with the trial is to
examine the production potential of Eucalyptus urophylla in Guangxi, southern China. In total
there are seven different treatments, out of which one is the common practice for StoraEnso
Guangxi, and one is an untreated control treatment. The three max-fertilized treatments have
gotten the amounts of fertilizers decided after leaf-nutrient analysis. If the nutrient analysis
revealed that the concentration of a specific nutrient was too low, extra amounts of that
nutrient were included in the next fertilization.
The treatment with the highest total production and mean annual increment at a stand age of
68 months is the max-fertilized treatment: NPK-300-B with a total stem wood production of
208.10 m3/ha and a MAI of 36.72 m3/ha. NPK-300-B was also the only treatment that had a
statistically significant higher total production and MAI than the Control treatment.
The mean basic density value was significantly lower in the wood harvested from treatment
NPK-300-B (469 kg/m3) compared to wood from the control (498 kg/m3).
The leaf analysis showed that the concentrations of all nutrients have increased in both
treatments since the last analysis in 2008 made by Rickard Carlsson and that the
recommended ratios have been reached for all nutrients, except for phosphorous (P) in the
control which was slightly under the recommended ratio.
Potential dry mass production/ ha/yr at the latitude of Guangxi is estimated to be around 30
tons, if water, nutrients and other biotic factors limiting the growth is satisfied. In treatment
NPK-300-B the production reaches 14.095 tons/ha and year when the volume production
peaked at a stand age of 68 months. So potentially the stem production is only 50% of the
estimated potential.
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