Growth Habit and Performance of Acacia Mangium and Acacia Auriculiformis Genotypes
Acacia mangium Willd. and A cacia auriculifotmis A. Cunn. ex. Benth. are two of the four fast-growing tropical acacias which have received the highest priority for genetic assessment and improvement. Even though A. mangium was proposed for timber production in a short rotation but experience has...
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| المؤلف الرئيسي: | |
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| التنسيق: | أطروحة |
| اللغة: | English English |
| منشور في: |
2003
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| الموضوعات: | |
| الوصول للمادة أونلاين: | http://psasir.upm.edu.my/id/eprint/10164/1/FH_2003_21.pdf |
| الوسوم: |
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| الملخص: | Acacia mangium Willd. and A cacia auriculifotmis A. Cunn. ex. Benth. are two of the
four fast-growing tropical acacias which have received the highest priority for genetic
assessment and improvement. Even though A. mangium was proposed for timber
production in a short rotation but experience has shown that it is impeded by its
susceptibility to heart rot, the multiple leaders (ML) formation, and the tendency of
growth to break off just short of the target of the desired size for sawn timber production.
However, the present work investigated the ML formation, its causes and variation and
concurrently assessed growth performance and examined the patterns of shoot growth
and some physiological traits of eight selected A. mangium and A. auriculiformis
genotypes through establishment of a field trial and three related glasshouse experiments. The field trial was a randomized complete block design with four replications utilizing
eight genotypes four each of the two species at two sites (burnt and unburned). Results at
23 months showed significant differences (P<0.001) between sites for the number of ML
trees/plot, basal diameter, and survival but not for height and between genotypes for ML
trees/plot, basal diameter (P<0.001), height (P<0.01) and survival (P<0.05). The site x
genotype interaction was significant (P< 0.001) only for ML trees/plot. |
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