Comparative study on DBH growth and wood density of Taxodium hybrid ‘Zhongshanshan 118’ and Taxodium distichum

ZHU Yuehua, PAN Biao, YU Chaoguang, YIN Yunlong, ZHANG Yaoli

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (6) : 201-206.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (6) : 201-206. DOI: 10.3969/j.issn.1000-2006.201810028

Comparative study on DBH growth and wood density of Taxodium hybrid ‘Zhongshanshan 118’ and Taxodium distichum

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Abstract

【Objective】In this study, we compared of the increase in diameter at breast height (DBH) and wood density of specimens the Taxodium hybrid ‘Zhongshanshan 118’ with Taxodium distichum, to provide a scientific basis for the breeding of T. hybrid ‘Zhongshanshan 118’ with T. distichum, and document the appropriate processing and utilization of T. ‘Zhongshanshan 118’ and T. distichum wood. 【Method】Five single tree of plantation T. ‘Zhongshanshan 118’ and five strains of plantation T. distichum were collected from a single site, under similar conditions, each single tree was 16 years old. Measurements of green wood moisture content, growth ring width, and basic wood density were recorded and compared. 【Result】The average green wood moisture content of T. ‘Zhongshanshan 118’ was 145.86%, 93.69% and 199.68% for the pith, intermediate wood, and sapwood, respectively. For T. distichum, values were 121.32% (pith), 81.93% (intermediate wood) and 203.84% (sapwood). The increase in diameter at breast height ofT. ‘Zhongshanshan 118’ trees was significantly accelerated from the 9th to the 14th year; in T. distichum increased from the 7th to the 14th year. For the first 12 years of growth, T. ‘Zhongshanshan 118’ specimens exhibited rapid growth; T. distichum specimens grew rapidly for the first nine years. The basic density of T. ‘Zhongshanshan 118’ wood averaged 0.314 g/cm3, but ranged from 0.292-0.346 g/cm3. The basic density of T. distichum averaged 0.332 g/cm3, with a range of 0.292-0.359 g/cm3. 【Conclusion】The green wood moisture content of T. ‘Zhongshanshan 118’ was higher than that of T. distichum. Juvenile wood was produced until the age of 12 and 8 years, for T. ‘Zhong-shanshan 118’ and T. distichum respectively. For T. ‘Zhongshanshan 118’, the radial variation in the width of growth rings increases moving away from the pith until the age of 6 years, and then decreases slowly to a stable value. In T. distichum, the radial variation of the width of the growth rings decreased annually. We found a positive correlation between current growth and wood basic density in T. ‘Zhongshanshan 118’. By contrast, T. distichum samples exhibited a negative correlation between current growth and wood basic density.

Key words

Taxodium hybrid ‘Zhongshanshan 118’ / Taxodium distichum / green wood moisture content / DBH growth / wood basic density

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ZHU Yuehua , PAN Biao , YU Chaoguang , et al . Comparative study on DBH growth and wood density of Taxodium hybrid ‘Zhongshanshan 118’ and Taxodium distichum[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2019, 43(6): 201-206 https://doi.org/10.3969/j.issn.1000-2006.201810028

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