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Fertilization in Eucalyptus urophylla plantations in Guangxi, southern China
| Content Provider | Semantic Scholar |
|---|---|
| Author | Timander, Per |
| Copyright Year | 2011 |
| Abstract | 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. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://stud.epsilon.slu.se/3294/1/Timander_P_110930.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
