Growth rules for a new stand of Pleioblastus chino var. hisauchii

doi:10.12302/j.issn.1000-2006.202112003

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (2): 123-129.doi: 10.12302/j.issn.1000-2006.202112003

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Growth rules for a new stand of Pleioblastus chino var. hisauchii

YAO Wenjing¹^,²(), LIU Guohua¹^,²^,^*(), WU Yanping², ZHAO Fuze³, WANG Fusheng¹^,², DING Yulong¹^,²

1. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
2. Bamboo Research Institute, Nanjing Forestry University, Nanjing 210037, China
3. Tongzi County Forestry Bureau of Guizhou Province, Tongzi 563299, China

Received:2021-12-02 Revised:2022-03-23 Online:2023-03-30 Published:2023-03-28

Abstract

Abstract:

【Objective】 This study revealed the growth rule of a new stand of Pleioblastus chino var. hisauchii, and explored the culm characteristics and rhizome growth of bamboo plants at different ages, providing a theoretical basis for cultivation and management of P. chino var. hisauchii and other bamboo species with mixed rhizome. 【Method】 We investigated the age structure and spatial distribution of 5-year-old P. chino var. hisauchii forest in the Baima experimental base of Nanjing Forestry University in Lishui District, Nanjing City. We first marked the location and age information of each bamboo plant in the forest, and randomly selected three healthy and disease-free bamboo plants at 1, 2, 3, 4 and 5 year-old. Then we measured their ground diameter, plant height, under-branch height, node length and corresponding node diameter. In addition, we traced the rhizome systems at 1, 2, 3, 4 and 5 year-old. Next, we counted the number of rhizome segments, rhizome nodes, rhizome branches buds, determined the rhizome length, rhizome diameter, rhizome node length and other indicators.【Result】 With the regeneration of new plantation forest, the number of young plants increased gradually during the previous 4 years. The ground diameter, plant height and under-branch height decreased with age. There was a linear positive correlation between ground diameter and plant height and between the under-branch height and plant height. The node diameter showed a decreased trend from base to top. There was also a linear positive correlation between the node length and node diameter. The node diameter, node length, average node diameter, and average node length of young bamboo plants were larger than those of old plants. The rhizome diameter, total rhizome length, number of rhizome segments and buds decreased with age. However, the rhizome length, rhizome node length, number of rhizome branches and shoot buds increased at first and then decreased with age, peaking in the fourth year.【Conclusion】 The new plantation forest showed an upward trend in an age structure, which was stable in the fourth year. The number of young bamboo plants was larger than that of the old plants in the previous 4 years. The young bamboo plants spread around with mother bamboo at the center. In general, the growth vigor of the aboveground and underground parts of bamboo plants decreased with age, which was strongest at two years of age.

Key words: Pleioblastus chino var. hisauchii, new plantation, age structure, culm formation, rhizome system

CLC Number:

Q944
S718

YAO Wenjing, LIU Guohua, WU Yanping, ZHAO Fuze, WANG Fusheng, DING Yulong. Growth rules for a new stand of Pleioblastus chino var. hisauchii[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(2): 123-129.

Figures/Tables 9

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Table 1

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竹龄/a age	鞭段数/条 the number of rhizome segments	单鞭鞭长/cm the length of single rhizome	总鞭长/cm total length of all rhizomes	平均鞭长/cm average rhizome length	节数/个 the number of nodes	鞭节长/cm the length of rhizome node	鞭径/mm rhizome diameter	岔鞭数/条 the number of rhizome branches
1	63	12.0~293.0	6 907.7	107.93±72.62	1 361	5.59±1.61	12.15±8.67	55
2	16	90.0~742.0	4 448.0	278.00±202.31	769	6.58±1.72	11.94±1.94	95
3	3	95.5~234.0	503.5	167.83±69.46	79	6.53±1.77	10.25±2.40	17
4	1	115.1	115.1	115.10	12	6.03±1.70	8.67±0.23	3
5	1	76.3	76.3	76.30	25	4.90±0.89	5.98±1.29	2

Growth rules for a new stand of Pleioblastus chino var. hisauchii

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竹龄/a age	休眠芽 dormant bud	烂芽 mashed bud	空芽 empty bud	鞭芽 rhizome bud	笋芽 shoot bud
1	863	75	211	55	13
2	351	78	89	95	41
3	6	0	11	17	16
4	5	1	0	3	4
5	13	1	8	2	0