Tree growth, trunk morphology and latewood differences for pond cypress among three sites of land, wetland and waterflooding
Tree growth, trunk morphology and latewood differences for pond cypress among three sites of land, wetland and waterflooding
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DOI：
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发表时间：
2020
影响因子：
3.1
通讯作者：
Kunxi Wang
中科院分区：
文献类型：
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作者：
Youming Xu;Han Lin;Yuchai Li;Kunxi Wang
Pond cypress (Taxodium ascendens) is grown in three sites of aquatic, wetland and terrestrial ground in the coast of South lake in Wuhan of China. The base of its stem is swollen as well as it usually have knee roots, called “aerial roots,” especially when it grows in wetland and waterflooding sites. To know the differences of its growth and wood properties in different growth sites is important for its artificial cultivation, wood important and wood utilization. Each five Pond cypress trees were collected from its three sites of land, wetland and waterflooding sites. Its growth patterns and latewood proportion were studied from the discs of different height of trees. Trunk morphology and knee roots were conducted also in this paper. Height growth in land site increased and reached the growth peak in 5–10 years, then grew slowly. In wet environment tree height was lowly rose and reached growth of peak in 15–20 years. In waterflooding environment tree high grew slowly and reached growth of peak in 25–30 years. Tree height growth in waterflooding sites was the smallest and the bigger in the sites of wetland land. Growth law of diameter at breast height (DBH) for Pond cypress in land sites first rose, then grew slowly and reached the growth peak in 10–15 years. In wet environment DBH growth rose slowly and reached the growth peak in 20–30 years. Trees volume increments in wet and waterflooding environments were less than land environment. Tree height, DBH and trees volume were 17.8 cm, 25 cm and 0.3885 m3 in land site, 17.5 cm, 19.4 cm and 0.2568 m3 in wetland, which were larger than those (14.2 cm, 19.8 m and 0.1852 m3 in waterflooding site. Stem form factors of Pond cypress were good in land and wetland sites, and worst in waterflooding sites. Stem of Pond cypress trees were straight from bottom to top in land and wetland sites. The base of Pond cypress trees expanded larger clearly in waterflooding sites. Their latewood percentages were 23.2% in land site and 12.8% in wetland, which were also bigger than 9.3% in waterflooding sites. Pond cypress grow very well in wetland and land sites, but it was not suitable to grow in the water sites. There were significant differences in tree growth, trunk morphology and latewood for Pond cypress among three sites of land, wetland and waterflooding.
