Population age structure and spatial point pattern of Cyclobalanopsis glauca in Baohua Mountain, Jiangsu Province, China

doi:10.3969/j.issn.1000-2006.201801001

Population age structure and spatial point pattern of Cyclobalanopsis glauca in Baohua Mountain, Jiangsu Province, China

ZHANG Xiaochen,ZHAO Yang,XIONG Zhongren,YI Xiangui,CHEN Xin

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (06) : 77-83.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (06) : 77-83. DOI: 10.3969/j.issn.1000-2006.201801001

Population age structure and spatial point pattern of Cyclobalanopsis glauca in Baohua Mountain, Jiangsu Province, China

ZHANG Xiaochen,ZHAO Yang,XIONG Zhongren,YI Xiangui,CHEN Xin^*

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【Objective】 The Baohua Mountain in Jiangsu Province is located on the northern edge of the subtropical zone, and Cyclobalanopsis glauca is an important component of its forest community. By studying the population dynamics of C. glauca, we can understand the succession dynamics of evergreen deciduous broad-leaved mixed forests and provide theoretical guidance for the formulation of forest protection strategies and promotion of succession in artificial forests. 【Method】A permanent one-hectare forest plot was established on the Baohua Mountain. A total of 432 C. glauca individuals with diameter at breast height(DBH)≥ 1 cm were measured, ranked into 10 diameter classes according to the DBH, and the age structure replaced by the diameter structure to discuss the population dynamics of C. glauca. The point pattern method(Ripley’s K-Function)was used to analyze the spatial distribution pattern. 【Result】The demographic structure of the C. glauca population follows an inverted “J” shape, suggesting a high regeneration rate and rapid growth of young individuals in this population. The highest and lowest mortality rates were detected in classes 5 and 6, respectively. The survivorship curve of the C. glauca population was close to the Deevey-Ⅱcurve. With an increase in the spatial scale, the distribution patterns of the C. glauca population fluctuated from random to clustered and then to uniform. The variation rules of the individuals in different age groups were slightly different. The distribution patterns of saplings and young, middle aged, and mature trees were characterized by a “clustered-random-uniform” change series as the spatial scale increased, whereas they were random for the old trees.【Conclusion】In the north subtropical evergreen deciduous broad-leaved mixed forest, the C. glauca population can maintain a stable state for a long time because of its strong adaptability. For natural and stable succession in artificial forests on the Baohua Mountain, and even the entire Ningzhen Mountain Range, artificial cultivation of C. glauca seedlings can be performed to improve the internal structure and promote regeneration of forest stands.

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ZHANG Xiaochen,ZHAO Yang,XIONG Zhongren,YI Xiangui,CHEN Xin. Population age structure and spatial point pattern of Cyclobalanopsis glauca in Baohua Mountain, Jiangsu Province, China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2018, 42(06): 77-83 https://doi.org/10.3969/j.issn.1000-2006.201801001

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