Seasonal dynamics in cambial activity and the formation of xylem and phloem in the branches of Cinnamomum camphora

• Autorzy: Dong M. , Xu Y.M. , Lin H. , Li X.Q. , Xia Q.Q.
• Języki publikacji: EN

Abstrakty

EN

The cambial activity and periodicity of secondary xylem and phloem formation have been less studied in tropical tree species than in temperate ones. Cambium activity is the only source of timber production. Studies on its activity and xylem formation can provide helpful data for dendrochronology and possible factors that control tree growth, the yield and quality of wood. Cinnamomum camphora is an important fast-growing tree for furniture and sculpture wood in South China. Its dynamics of cambial activity was not reported. During the growth season in 2011, five trees of Cinnamomum camphora plantation were monitored on the campus of Huazhong Agricultural University in central china (located on 113°41’ to 115°05’ E and 29°58’ to 31°22’ N). Sampling time was from 13, February 2011 to 13, February 2012. Some small stems of 15–20 cm length were selected to sample in the middle of 2–3 years old health branches in the central crown of these trees. The observational study found that the cambium of camphor trees was active from March to October and dormant from November to February. Onset of cambial cell division was observed in early March, one week after sprouting of new buds. The morphology of the cells and number of cell layers in the cambium zone varied throughout the year. In early March, cambium reactivated with the rising of temperature, the cell wall was relative thick. The number of cell layers increased from 2–3 in middle Feb. to 3–5. In June, the number of cell layers in cambium reached the maximum of 5–7 in a radial direction. In mid March, phloem cells began to differentiate, followed by xylem three weeks later. The number of cell layers in immature phloem and xylem increased dramatically before mid June and the increment of cell layers in xylem was almost fifth times of phloem in the differentiating process. The phloem cells mainly stopped dividing new cells in end of October, but xylem cells were still in the activity a week later. The annual activities of cambium was in accordance with the air mean temperature change in 2011–2012. The results showed that the cambial activity and formation of xylem and phloem were related to the environmental factors, especially the temperature.

Słowa kluczowe

EN

seasonal dynamics; cambial activity; formation; xylem; phloem; branch formation; tree; tropical tree; Cinnamomum camphora; wood formation; phenology

• Wydawca: -
• Czasopismo: Dendrobiology
• Rocznik: 2016
• Tom: 75
• Opis fizyczny: p.13-21,fig.,ref.

Twórcy

autor

Dong M.

• College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China

autor

Xu Y.M.

• College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China

autor

Lin H.

• College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China

autor

Li X.Q.

• College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China

autor

Xia Q.Q.

• College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China

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Identyfikatory

DOI

10.12657/denbio.075.002